Updated on 2024/04/02

写真a

 
TSUJIMOTO Kumiko
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
Homepage
https://monsoon.env.okayama-u.ac.jp
External link

Degree

  • Dr. Eng ( 2009.3   The University of Tokyo )

Research Interests

  • soil physics

  • meteorology

  • soil moisture

  • hydrology

  • 科学技術外交

  • Microwave remote sensing

  • land surface process

  • land-atmosphere intaraction

  • agricultural land management

  • 途上国支援

Research Areas

  • Environmental Science/Agriculture Science / Rural environmental engineering and planning  / かんがい排水学、水文・気象学

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Hydroengineering  / hydrology

Education

  • The University of Tokyo   大学院工学系研究科   社会基盤学専攻

    2006.4 - 2009.3

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  • Kyoto University   地球環境学舎   環境マネジメント専攻

    2004.4 - 2006.3

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  • Kyoto University   農学部   生産環境科学科

    2000.4 - 2004.3

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  • 奈良県立奈良高等学校    

    1997.4 - 2000.3

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Research History

  • Okayama University

    2023.5

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  • 岡山大学学術研究院環境生命自然科学学域   助教

    2023.4

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  • 岡山大学グリーンイノベーションセンター   助教

    2022.4

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  • Okayama University   Graduate School of Environmental and Life Science   Assistant Professor

    2021.4 - 2023.3

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  • Okayama University   Graduate School of Environmental and Life Science   Assistant Professor

    2017.4 - 2021.3

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  • The University of Tokyo   Department of Civil Engineering   Research Associate

    2012.7 - 2017.3

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  • The University of Tokyo   Department of Civil Engineering   Project Research Associate

    2012.4 - 2012.6

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  • The University of Tokyo   Earth Date Integration and Fusion Research Initiative (EDITORIA)   Project Research Associate

    2009.4 - 2012.3

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Professional Memberships

  • Japanese Society of Soil Physics

    2019.7

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  • European Geosciences Union

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  • The Japanese Society of Irrigation, Drainage and Rural Engineering

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  • Japan Geoscience Union

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  • Asia Oceania Geosciences Society

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  • Japan Society of Civil Engineers

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  • Japan Society of Hydrology and Water Resources

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  • Institute of Electrical and Electronics Engineers (IEEE)

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Committee Memberships

  • 独立行政法人国際協力機構（JICA）   農業・農村開発協力における気候変動対策等の推進に関する課題別支援委員会委員  

    2023.9   

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  • 一般財団法人日本宇宙フォーラム   ALOS-2アーカイブデータを用いた事業化実証における検討委員  

    2023.6   

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  • 農林水産省   独立行政法人評価有識者会議委員  

    2023.4   

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  • 国際協力機構（JICA）   農業・農村開発協力における気候変動対策の取組に関する検討会委員  

    2022.5 - 2023.3   

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  • 岡山市浸水対策推進協議会   委員  

    2021.4   

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  • 岡山市公害対策審議会   委員  

    2021.4   

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  • 宇宙航空研究開発機構（JAXA）   地球観測に関する科学アドバイザリ委員会分科会メンバー  

    2020.8   

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  • International Commission on Irrigation and Drainage   International Commission on Irrigation and Drainage  

    2019.9   

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  • 河川情報センター（FRICS）   嘱託研究員  

    2016.8 - 2017.3   

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  • 宇宙航空研究開発機構（JAXA）   降水観測ミッション（PMM）利用検討委員会委員および利用推進分科会メンバー  

    2015.5 - 2020.3   

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    Committee type：Other

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  • 国際協力機構（JICA）   国別研修講師  

    2015.5 - 2015.6   

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  • 国際協力機構（JICA）   国別研修講師  

    2014.4   

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Papers

  • 人工衛星搭載マイクロ波放射計AMSR2に基づく全球土壌水分量推定アルゴリズムの改良提案と結果の検証 Reviewed

    辻本久美子, 太田哲

    土木学会論文集B1(水工学)   2023

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    Authorship：Lead author,　Corresponding author   Language：Japanese  

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  • Comparison of the Dobson model with other dielectric models at the C-band microwave band Invited Reviewed

    Kumiko Tsujimoto

    Journal of JJSCE   2023

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    Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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  • Effect of the change of the wet-soil dielectric model in the microwave soil moisture retrieval algorithm from satellite Reviewed

    Kumiko Tsujimoto, Tetsu Ohta

    The Journal of Japan Society of Civil Engineers   78 ( 2 )   I_517 - I_522   2022.11

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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  • Dielectric behavior of wet soils in the 1-36 GHz microwave range: Modeling and validation Reviewed

    Kumiko Tsujimoto, Tetsu Ohta, Hideyuki Fujii, Mitsuru Komatsu

    Journal of the Japanese Society of Soil Physics   151 ( 151 )   3 - 24   2022.7

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.34467/jssoilphysics.151.0_3

    J-GLOBAL

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  • Backwater Effect of Clogging of Aquatic Plants at Fine-Particle Screens on Inland Flooding in Okayama Reviewed

    Takumi Inaba, Kumiko Tsujimoto, Yoshitaka Nakashima

    Water   14 ( 13 )   1980 - 1980   2022.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/w14131980

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  • Quantifying the GCM-related uncertainty for climate change impact assessment of rainfed rice production in Cambodia by a combined hydrologic - rice growth model Reviewed

    Kumiko Tsujimoto, Nana Kuriya, Tetsu Ohta, Koki Homma, Monichoth So Im

    Ecological Modelling   464   109815 - 109815   2022.2

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    The effects of climate change on agriculture are a major concern for global food security. In this study, the impacts of climate change on rainfed rice production in the granary of Cambodia were examined on a basin scale by developing and applying a combined model consisting of a crop model and a basin-scale distributed hydrological model. The response of rice production to soil-water availability was simulated for past (1981–2000) and future (2041–2060, 2081–2100) periods. From 34 general circulation models (GCMs) that participated in the Coupled Model Intercomparison Project Phase 5 (CMIP5), 5 GCMs were selected by evaluating monthly rainfall in the past. Although annual rainfall was projected to increase by all five selected GCMs, notable decreases in rainfed rice production were projected with 3 GCMs, while small changes were projected with the other 2 GCMs. The main factor restricting future rice production was soil water availability, brought by the projected change in the seasonal distribution of rainfall and the projected more severe dry spells in the early monsoon season. The results suggest the importance of the selection and bias correction of GCMs to force rice crop models and of the simulation of soil water flow on a basin scale for the assessment of rain-fed rice production. In particular, improvements in projections of rainfall amounts over shorter periods rather than annual or seasonal periods, which fit within the time scales of rice plant growth, were suggested to be important.

    DOI： 10.1016/j.ecolmodel.2021.109815

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  • Multiyear analysis of the dependency of the planting date on rainfall and soil moisture in paddy fields in Cambodia, 2003–2019 Reviewed

    Kumiko Tsujimoto, Kotaro Ono, Tetsu Ohta, Koemorn Chea, E-Nieng Muth, Sanara Hor, Lyda Hok

    Paddy and Water Environment   19 ( 4 )   635 - 648   2021.7

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    <title>Abstract</title>The dependencies of the planting date on rainfall and soil moisture in paddy fields in Cambodia were analyzed to quantify farmers’ empirical knowledge regarding their decision of the planting date. Remote sensing data from multiple satellites covering the 2003–2019 period were analyzed. The planting dates in rain-fed paddies ranged from April to August, with large spatial variations and year-to-year fluctuations. In years when planting was suppressed in April and May, planting was extensively enhanced in June and August compared to normal years, and vice versa. Over the northeastern side of Tonle Sap Lake and south of Phnom Penh city, the areas planted in April and May were found to have positive correlations with rainfall and soil moisture, suggesting that wetter-than-average conditions encouraged farmers to plant earlier in the season. In contrast, this relationship was unclear on the western side of Tonle Sap Lake, where the rainfall amounts were larger throughout the year than in other areas in Cambodia. In this region, the relationship between the planting area and soil water availability was either unclear or was even slightly negative from June to August. Since more frequent dry spells have been detected after the onset of the rainy season in recent years, further studies and disseminations of potential changes in dry spells are important for the agronomic adaptation of planting dates under climate change.

    DOI： 10.1007/s10333-021-00863-6

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    Other Link： https://link.springer.com/article/10.1007/s10333-021-00863-6/fulltext.html

  • Dielectric mixing models of moist soils for microwave satellite observation of soil moisture: a theoretical analysis Reviewed

    Kumiko Tsujimoto

    75 ( 2 )   I_7 - I_12   2019.8

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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  • When do rice terraces become rice terraces? Invited Reviewed

    Yasushi Mori, Masaya Sasaki, Eisei Morioka, Kumiko Tsujimoto

    Paddy and Water Environment   1 ( 8 )   2019.3

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  • Estimation of planting date in paddy fields by time-series MODIS data for basin-scale rice production modeling. Invited Reviewed

    Kumiko Tsujimoto, Tetsu Ohta, Yoshihiro Hirooka, Koki Homma

    Paddy and Water Environment   1 ( 8 )   2019.3

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  • Numerical and experimental study on the risk of paddy field damage due to river bank breach during serious floods. Invited Reviewed

    Tetsuro Tsujimoto, Kumiko Tsujimoto

    Paddy and Water Environment   1 ( 8 )   2019.3

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  • Land-Lake-Atmosphere Interaction under Global Climate Change and Regional Landuse Change over a Large Tropical Lake and its Vicinities: case study in Cambodia

    Kumiko Tsujimoto

    Environmental Risks for Socioeconomic Development: Proceedings of the 3rd (2nd STEPS) Russian-Japanese Collaboration Seminar for Sustainable Development   171 - 176   2018.9

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  • Diurnal pattern of rainfall in Cambodia: its regional characteristics and local circulation Reviewed

    Kumiko Tsujimoto, Tetsu Ohta, Kentaro Aida, Katsunori Tamakawa, Monichoth So Im

    Progress in Earth and Planetary Science   39 ( 5 )   2018.8

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  • Parallel improvement of hydrological simulation and microwave satellite soil moisture observation with a unified soil water model Reviewed

    Kumiko Tsujimoto, Tetsu Ohta, Yasushi Mori

    The Journal of Japan Society of Civil Engineers   74 ( 4 )   I_979 - I_984   2018.2

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  • When do rice terraces become rice terraces? Reviewed

    Yasushi Mori, Masaya Sasaki, Eisei Morioka, Kumiko Tsujimoto

    proceedings of PAWEES-INWEPF   2018

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  • Estimation of planting date in paddy fields by time-series MODIS data for basin-scale rice production modelling Reviewed

    Kumiko Tsujimoto, Tetsu Ohta, Yoshihiro Hirooka, Koki Homma

    proceedings of PAWEES-INWEPF   2018

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  • Risk of paddy field damage due to river bank breach during serious flood Reviewed

    Tetsuro Tsujimoto, Kumiko Tsujimoto

    proceedings of PAWEES-INWEPF   2018

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  • Climate change impact on rice production in Musi river basin in Indonesia

    Koki Homma, Toshio Koike, Kumiko Tsujimoto, Tetsu Ohta

    Journal of Earth Science & Climatic Change   08 ( 10 )   31   2017

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：OMICS Publishing Group  

    DOI： 10.4172/2157-7617-c1-036

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  • Evaluation of cultivation environment and management based on LAI measurement in farmers' paddy fields in Pursat province, Cambodia

    Yoshihiro Hirooka, Koki Homma, Taisuke Kodo, Tatsuhiko Shiraiwa, Kim Soben, Mithona Chann, Kumiko Tsujimoto, Katsunori Tamagawa, Toshio Koike

    FIELD CROPS RESEARCH   199   150 - 155   2016.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

    Rice is by far the most important crop in Cambodia. The improvement of its productivity is strongly recommended, but information about cultivation environment, management and their effects on rice production in farmers' paddy fields is quite limited. This study periodically measured the leaf area index (LAI) by using a plant canopy analyzer and conducted yield, water, soil and management investigations in 77 farmers' paddy fields in the Bakan district, Pursat province, Cambodia in 2014. Because the LAI showed linear growth in almost all farmers' fields, the LAI growth rate was determined by linear regression. The grain yield ranged from 70.8 gm(-2) to 499.0 gm(-2) and was positively correlated with the maximum LAI. The variability in the maximum LAI was mainly explained by the LAI growth rate, while the growth period had a significant correlation with the maximum LAI only in the broadcast fields, where earlier planting led to larger LAI. The result of the ANCOVA shows that the LAI growth rate was affected by seeding date, water status and soil condition (C content and C/N ratio) while the effect of planting method (transplanting/broadcasting) and N fertilizer was non-significant. The non-significance of effect of N fertilizer may imply the timing or method of application is improper. The results suggest that the key means to improve rice productivity are effective application of fertilizer and selection of planting methods dependent on the soil fertility, together with water-saving irrigation method. (C) 2016 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.fcr.2016.08.031

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  • Investigation of the estimation of soil moisture at the Cambodia Pursat station by using LDAS-UT Reviewed

    Katsunori Tamagawa, Rasmy Mohamed, Toshio Koike, Kumiko Tsujimoto, Kentaro Aida, Hideyuki Fujii, Takao Masumoto

    The Journal of Japan Society of Civil Engineers   71 ( 4 )   I_409 - I_414   2015

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.2208/jscejhe.71.I_409

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  • Validation of satellite precipitation products over Cambodia Reviewed

    Kumiko Tsujimoto, Toshio Koike, Monichoth So Im, Kentaro Aida, Katsunori Tamagawa, Tomoyuki Nukui, Shin'ichi Sobue

    Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan   12 ( ists29 )   Tn_41 - Tn_46   2014

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Aeronautical and Space Sciences  

    DOI： 10.2322/tastj.12.Tn_41

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  • Water and Food Security under Climate Change in Cambodia Reviewed

    Monichoth So Im, Kumiko Tsujimoto, Kentaro Aida, Katsunori Tamagawa, Tetsu Ohta, Toshio Koike, Tomoyuki Nukui, Shin'ichi Sobue, Koki Homma

    Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan   12 ( ists29 )   Tn_31 - Tn_39   2014

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society for Aeronautical and Space Sciences  

    DOI： 10.2322/tastj.12.Tn_31

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  • A trial impact assessment of rice production by climate change and irrigation at the granary of western Cambodia Reviewed

    Tetsu Ohta, Kumiko Tsujimoto, Koki Homma, Toshio Koike, Monichoth So Im

    The Journal of Japan Society of Civil Engineers   70 ( 4 )   I_265 - I_270   2014

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    Rice yields at the Sangker river basin in western Cambodia are simulated by a coupled model of the distributed hydrological model WEB-DHM and the rice growth model SIMRIW-rainfed. The results are validated by in-situ statistical data and FAOSTAT. Then, future rice yields are also simulated by using GCMs outputs. In addition, a simple irrigation model is introduced into the coupled model. By using this model, rice yields in consideration of climate change and irrigation are assessed.<br>In this study, effectiveness of irrigation in this river basin is shown for both of the present and future climates. The results showed that, by constructing irrigation facilities, a stable rice yield can be obtained even if no yield is obtained at rain-fed paddy fields. Also, this study showed that a variation of future rainfall pattern will affect a variation of rice yield.

    DOI： 10.2208/jscejhe.70.I_265

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    Other Link： https://jlc.jst.go.jp/DN/JLC/20010509768?from=CiNii

  • Onset of the Asian Summer Monsoon and land-atmosphere interaction over the Indochina Peninsula Reviewed

    Kumiko Tsujimoto, Toshio Koike

    The Journal of Japan Society of Civil Engineers   70 ( 4 )   I_295 - I_300   2014

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.2208/jscejhe.70.I_295

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  • Land-lake breezes at low latitudes: The case of Tonle Sap Lake in Cambodia Reviewed

    Kumiko Tsujimoto, Toshio Koike

    Journal of Geophysical Research Atmospheres   118 ( 13 )   6970 - 6980   2013.7

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Blackwell Publishing Ltd  

    Tonle Sap Lake is the largest freshwater lake in Southeast Asia. During the postmonsoon season, a small linear cloud system has been observed over this lake in early morning, while the sky above the surrounding land is clear. Although this cloud system is apparently generated by land breezes, previous studies on land-lake (sea) circulation have suggested that environmental factors at low latitudes inhibit development of nocturnal land breezes. In this study, we investigate the mechanism of these early morning clouds through numerical simulation. The simulations show a linear updraft system over the lake, forming along the southwest lakeshore around 22:00 and moving northeast to the middle of the lake. The heavier air mass from the land meets the extraordinarily warm and humid air mass over the lake, triggering updrafts under the conditionally convective instability. The characteristic high surface water temperature was favorable for generation of the land breeze and updraft systems. That high surface water temperature of the lake is produced by the tropical climate along with efficient energy absorption because of the shallowness of the water body. This unique feature can generate a clear nocturnal land breeze circulation accompanying a migrating updraft system over the lake despite its low latitude. Key Points Land-breeze develops even though this lake is located in the low-latitudes. A lined-up cloud is formed at night over the lake by the very hot lake water. The convection migrates over the lake by the katabatic wind. ©2013. American Geophysical Union. All Rights Reserved.

    DOI： 10.1002/jgrd.50547

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  • Land-lake breezes at low latitudes: The case of Tonle Sap Lake in Cambodia Reviewed

    Kumiko Tsujimoto, Toshio Koike

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   118 ( 13 )   6970 - 6980   2013.7

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER GEOPHYSICAL UNION  

    Tonle Sap Lake is the largest freshwater lake in Southeast Asia. During the postmonsoon season, a small linear cloud system has been observed over this lake in early morning, while the sky above the surrounding land is clear. Although this cloud system is apparently generated by land breezes, previous studies on land-lake (sea) circulation have suggested that environmental factors at low latitudes inhibit development of nocturnal land breezes. In this study, we investigate the mechanism of these early morning clouds through numerical simulation. The simulations show a linear updraft system over the lake, forming along the southwest lakeshore around 22:00 and moving northeast to the middle of the lake. The heavier air mass from the land meets the extraordinarily warm and humid air mass over the lake, triggering updrafts under the conditionally convective instability. The characteristic high surface water temperature was favorable for generation of the land breeze and updraft systems. That high surface water temperature of the lake is produced by the tropical climate along with efficient energy absorption because of the shallowness of the water body. This unique feature can generate a clear nocturnal land breeze circulation accompanying a migrating updraft system over the lake despite its low latitude.

    DOI： 10.1002/jgrd.50547

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  • Development of Soil Moisture Algorithm Using ALOS/PALSAR in Paddy Field, Cambodia

    Kentaro Aida, Toshio Koike, Monichoth So Im, Kumiko Tsujimoto, Katsunori Tamagawa, Tomoyuki Nukui, Shin'ichi Sobue, Shi, J

    proceedings of 29th International Symposium on Space Technology and Science   2013

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  • Katsunori Tamagawa, Rasmy Mohamed, Toshio Koike, Kumiko Tsujimoto, Kentaro Aida

    Investigation of, he, Estimation of, Soil moisture, the Soil Parameter in, the Dry Season in, Cambodia, Using the La, Data Assimilation, System Developed at the, University of Tokyo, LDAS-UT

    SANE   113 ( 88 )   31 - 34   2013

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    Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

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  • Development of a coupled model of a distributed hydrological model and a rice growth model for grasping necessary information for rain-fed agriculture Reviewed

    Kumiko Tsujimoto, Koki Homma, Toshio Koike, Tetsu Ohta

    The Journal of Japan Society of Civil Engineers   69 ( 4 )   I_511 - I_516   2013

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.2208/jscejhe.69.I_511

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  • Katsunori Tamagawa, Mohamed Rasmy, Kentaro Aida, Kumiko Tsujimoto, Toshio Koike, Monichoth So Im, Tomoyuki Nukui, Shin'ichi Sobue

    Katsunori Tamagawa, Mohamed Rasmy, Kentaro Aida, Kumiko Tsujimoto, Toshio Koike, Monichoth So Im, Tomoyuki Nukui, Shin'ichi Sobue

    proceedings of 29th International Symposium on Space Technology and Science   2013

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  • Validation of satellite precipitation products over Cambodia

    Kumiko TsujimotoKumiko Tsujimoto, Toshio Koike, Monichoth So Im, Kentaro Aida, Katsunori Tamagawa, Tomoyuki Nukui, Shin'ichi Sobue

    proceedings of 29th International Symposium on Space Technology and Science   12 ( ists29 )   Tn_41 - Tn_46   2013

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Japan Society for Aeronautical and Space Sciences  

    DOI： 10.2322/tastj.12.Tn_41

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  • Water and Food Security under Climate Change in Cambodia

    Monichoth So Im, Kumiko Tsujimoto, Kentaro Aida, Katsunori Tamagawa, Tetsu Ohta, Toshio Koike, Tomoyuki Nukui, Shin'ichi Sobue, Koki Homma

    proceedings of 29th International Symposium on Space Technology and Science   12 ( ists29 )   Tn_31 - Tn_39   2013

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Japan Society for Aeronautical and Space Sciences  

    DOI： 10.2322/tastj.12.Tn_31

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  • Requisite Conditions for post-monsoon rainfall in Cambodia by looking through 2009 rainfall data Invited Reviewed

    Kumiko Tsujimoto, Toshio Koike

    Journal of Hydroscience and Hydraulic Engineering   30 ( 1 )   1 - 14   2012

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  • Two diurnal cycle systems with different spatial scales and their effects on the post-monsoon rainfall in the inland of the Indochina Peninsula Reviewed

    Kumiko Tsujimoto, Toshio Koike

    The Journal of Japan Society of Civil Engineers   68 ( 4 )   I_451 - I_456   2012

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  • Interaction of large-scale atmospheric condition and local circulation which affects Cambodian post-monsoon rainfalls Reviewed

    Kumiko Tsujimoto, Toshio Koike

    The Journal of Japan Society of Civil Engineers   67 ( 4 )   I_463 - I_468   2011

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  • GEWEX/iLEAPS合同国際会議参加報告 Invited Reviewed

    萬和明, 山崎大, 吉田龍平, 新田友子, Pokhrel,Y, 辻本久美子, 平林由希子, 田中賢治, 檜山哲哉

    水文・水資源学会誌   23 ( 1 )   83 - 91   2010

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    Language：Japanese   Publisher：水文・水資源学会  

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  • メコン河下流域における湖と大気水循環の相互作用と地域水利用への影響

    辻本 久美子

    東京大学   2009

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    Language：Japanese   Publishing type：Doctoral thesis  

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  • Effects of the locally-induced precipitation of the stream flow during the dry season at the vicinities of Tonle Sap Lake Reviewed

    Kumiko Tsujimoto, Toshio Koike

    Annual Journal of Hydraulic Engineering   53   337 - 342   2009

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

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  • Seasonal changes in radiation and evaporation implied from the diurnal distribution of rainfall in the Lower Mekong Reviewed

    Tsujimoto Kumiko, Masumoto Takao, Mitsuno Toru

    HYDROLOGICAL PROCESSES   22 ( 9 )   1257 - 1266   2008.4

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    Solar radiation is an important input to many empirical equations for estimating evaporation, which in turn plays all important role in the hydrologic cycle in the Lower Mekong River Basin due to the high evaporation potential of the tropical monsoon climate. Few proper meteorological data exist for the Lower Mekong River Basin, however, and the region's meteorological conditions, including seasonal variation in radiation and evaporation, have not been clarified. In this study, ground-based hourly hydrometeorological data were collected at three observation stations located in different land-Use types (urban district, paddy area, and lake) in the Lower Mekong River Basin. These data were analysed to investigate the seasonal variation ill radiation and evaporation related to the diurnal distribution of rainfall. Contrary to common expectations, our results showed that rainy and dry seasons had nearly the same amount of solar radiation in the Lower Mekong River Basin because (1) rainy seasons had a relatively larger amount of extraterrestrial radiation; (2) no rain fell oil nearly half of the days during rainy seasons; and (3) the amount of solar radiation on rainy days reached 88% of that on non-rainy days. The third factor was attributed to the high frequency of evening rainfall. Furthermore, this rainfall-radiation relationship meant that rainy seasons had a large amount of net radiation due to the low reduction ratio of solar radiation and an increase in long-wave incoming radiation. Accordingly, rainy seasons had a high evaporation potential. Moreover, for the rain-fed rice paddies that prevail in this region, sufficient radiation during the rainy season Would be a great advantage for rice growing. Copyright (C) 2008 John Wiley & Soils, Ltd.

    DOI： 10.1002/hyp.6935

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  • Mechanism of locally-induced convection development and its effects on vapor transportation over Tonle Sap Lake Area Reviewed

    Kumiko Tsujimoto, Toshio Koike

    Annual Journal of Hydraulic Engineering   52   247 - 252   2008

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  • Hydro-meteorological observation and analysis of observed data at Tonle Sap Lake and its environs, urban and paddy areas Reviewed

    Takao Masumoto, Kumiko Tsujimoto, Hiroaki Somura

    Technical report of the National Institute for Rural Engineering   206 ( 206 )   219 - 236   2007

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  • The Relationship between Seasonal Radiation Amount and Time of Rainfall Event in Tropical Monsoon Asia

    Tsujimoto Kumiko, Masumoto Takao, Mitsuno Toru

    Proceeding of Annual Conference   18   39 - 39   2005

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    Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    On-site observation data for about 5 years in Cambodia, which is located in Tropical Monsoon Asia, were collected and analyzed to evaluate its hydro-meteorological environment in wet and dry seasons, especially focusing on radiation amount. Daily radiation amount was proved to be almost same for each season and its amount for rainy days reached about 88% of that for non-rainy days. This was shown to be attributed to the time of rainfall event: most of the rainfall events were concentrated in the evening whereas not so many events were there around noon. Moreover, duration of the rainfall events was about 1 hour for most cases. The result we obtained here is thought to be applicable not only in Cambodia but also in other areas in Tropical Monsoon Asia. Evapotranspiration must be accelerated in the wet season with high radiative energy under the wet environment so that this relationship between radiation amount and time of rainfall event should be taken into account for evaluating evapotranspiration amount in this area.

    DOI： 10.11520/jshwr.18.0.39.0

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Books

  • Water and Life in Tonle Sap Lake

    （ Role： Contributor ,  Climate and Rainfall）

    Springer Singapore  2022.7  （ ISBN:9789811666315 ）

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  • First steps in conservation and restoration, A Banaue story: restoring a world heritage treasure

    Yasushi Mori, Kumiko Tsujimoto（ Role： Contributor）

    Universal Harvester Inc.  2018 

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  • Environmental Risks for Socioeconomic Development: Proceedings of the 3rd (2nd STEPS) Russian-Japanese Collaboration Seminar for Sustainable Development

    （ Role： Contributor ,  Land-Lake-Atmosphere Interaction under Global Climate Change and Regional Landuse Change over a Large Tropical Lake and its Vicinities: case study in Cambodia）

    Land-Lake-Atmosphere Interaction under Global Climate Change and Regional Landuse Change over a Large Tropical Lake and its Vicinities: case study in Cambodia  2018 

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MISC

  • みんなのミニレビュー：土壌水分の衛星広域観測と湿潤土壌誘電率

    辻本久美子

    土壌の物理性   150   62 - 63   2022.3

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  • 私のビジョン：農業農村工学分野での研究・教育について考えること Invited Reviewed

    Journal of the Japanese society of irrigation, drainage, and rural engineering   88 ( 8 )   682 - 684   2020.8

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  • カンボジア・トンレサップ湖周辺域における湖上と水田地帯での乱流フラックス観測

    辻本久美子, 小池俊雄, 田中健路, 会田健太郎, 玉川勝徳

    日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology   2016   77   2016

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  • Climate Change Impact Assessment on Water and Agriculture in Cambodia as Part of the Water-Climate-Agriculture Workbench

    APN science bulletin : global environmental change   5   26 - 28   2015.3

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  • Investigation of the Estimation of Soil moisture and the Soil Parameter in the Dry Season in Cambodia Using the Land Data Assimilation System Developed at the University of Tokyo (LDAS-UT)

    TAMAGAWA Katsunori, KOIKE Toshio, RASMY Mohamed, TSUJIMOTO Kumiko, AIDA Kentaro

    Technical report of IEICE. SANE   113 ( 88 )   31 - 34   2013.6

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Surface soil moisture and the soil parameter are the essential variables that govern interactions between the land surface and atmosphere. A Land Data Assimilation System developed in The University of Tokyo (LDAS-UT) enables estimation of the surface soil moisture and soil parameter estimation at regional and global scales, to improve both our understanding of land-atmosphere interactions and the initial conditions of the General Circulation Model. The LDAS-UT comprises a land surface model (LSM), which calculates surface fluxes and soil moisture, a radiative transfer model (RTM), which estimates microwave brightness temperature, and an optimization scheme, which provides optimal values of soil moisture through minimizing the difference between the model output and observed brightness temperature. The LDAS-UT is initially optimized using LSM and RTM parameters such as soil texture, porosity with several months forcing data and satellite microwave brightness temperature data. These optimized parameter values are then used in a second phase, allowing retrieval of soil moisture data and the surface energy budget by assimilating the brightness temperature into the LSM in a daily assimilation cycle. The LDAS-UT was applied to Cambodia, and the estimated results of soil moisture in the dry season showed good agreement with ground-based observations of soil moisture.

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  • D201 低緯度地帯における陸風循環 : カンボジアのトンレサップ湖周辺域に見られる特徴(境界層I,一般口頭発表)

    辻本 久美子, 小池 俊雄

    大会講演予講集   101   217 - 217   2012

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  • Reinforcement of in-situ raingauge network in Cambodia and its outcome: Characteristics of post-monsoon rainfall in 2009

    Tsujimoto Kumiko, Koike Toshio, Aida Kentaro, So Im Monichoth, Preap Sameng, Long Saravuth

    Proceeding of Annual Conference   23 ( 0 )   16 - 16   2010

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    DOI： 10.11520/jshwr.23.0.16.0

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Presentations

  • Development of the AMSR3 & GCOM-W research algorithm for global soil moisture content

    Kumiko Tsujimoto

    The Joint PI Meeting of JAXA Earth Observation Missions FY2023  2023.11.8 

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  • 大気－陸面相互作用に着目した降水予測：農地管理の視点から Invited

    辻本久美子

    日本流体力学会第32回中四国・九州支部講演会  2023.11 

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  • 湿潤土壌の誘電特性に関するデータベース構築とモデル化

    辻本久美子, 太田哲, 岸本爽汰

    2023年度土壌物理学会大会  2023.10.21 

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  • 人工衛星搭載マイクロ波放射計AMSR2に基づく全球土壌水分量推定アルゴリズムの改良提案と結果の検証

    辻本久美子, 太田哲

    第68回土木学会水工学講演会  2023.10 

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  • Cバンドマイクロ波に対する湿潤土壌誘電率モデルの圃場スケール検証

    辻本久美子, 太田哲, 井澤克文

    水文・水資源学会 日本水文科学会2023年度研究発表会  2023.9.7 

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  • Radar-based rainfall estimation over Cambodia

    H. Kamimera, K. Tsujimoto, M. Hak, O. Ryna, S. I. Monichoth, K. Youtray

    9th International Conference on Flood Management (ICFM9)  2023.2 

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  • マイクロ波を用いた土壌水分衛星観測アルゴリズムにおける湿潤土壌誘電率モデル改変効果

    辻本久美子, 太田哲

    第67回土木学会水工学講演会  2022.11.25 

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  • Development of the AMSR3 & GCOM-W research algorithm for global soil moisture content

    Kumiko Tsujimoto, Tetsu Ohta

    JAXA Joint PI Meeting (GCOM-W & AMSR3)  2022.11.7 

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  • Comparison of Different Dielectric Models for Wet Soils

    Kumiko Tsujimoto, Tetsu Ohta

    2022.10.29 

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  • Effect of Aquatic Plants on the Channel Water Level Management in Okayama City and Its Countermeasures

    Takumi Inaba, Kumiko Tsujimoto, Yoshitaka Nakashima

    2022.8 

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  • The AWCI Activity in Cambodia: A “Water-Climate-Agriculture” Integrated System. Invited

    Kumiko Tsujimoto

    GEO Virtual Symposium 2022 - Global Action for Local Impact -  2022.5.3 

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  • Prediction of precipitation and streamflow by land-atmosphere data assimilation

    Kumiko Tsujimoto

    JAXA Joint PI Meeting (GCOM-W & AMSR3)  2022.1.17 

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  • An improved soil moisture retrieval algorithm from GCOM-W/AMSR2 microwave observations using Mironov dielectric model

    Kumiko Tsujimoto, Tetsu Ohta

    2021.10.30 

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  • 地球観測衛星から水循環をモニタリングする －気候変動下での水災害軽減に向けて－

    辻本久美子

    岡山大学新工学部発足記念シンポジウム  2021.9.29 

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  • Addressing the Climate-Water-Agriculture Nexus in Cambodia through Field Observation and Numerical Modelling

    Kumiko Tsujimoto

    2021.9.16 

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  • バルク法によるトンレサップ湖の潜熱量の推定

    伊藤祐二, 籾井和朗, 辻本久美子, 増本隆夫, 吉岡有美

    水文・水資源学会2021 年度総会・研究発表会  2021.9 

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  • Oxygen and hydrogen isotopic signatures of surface and groundwater during a dry season in the Tonle Sap Lake basin

    Yumi Yoshioka, Takao Masumoto, Kumiko Tsujimoto, Yuji Ito

    2021.5 

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  • Prediction of precipitation and streamflow by land-atmosphere data assimilation

    Kumiko Tsujimoto

    JAXA Joint PI Meeting (GCOM-W & AMSR3)  2021.1.19 

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  • 地球観測ビッグデータを利用した営農支援ツールの開発

    辻本久美子

    イノベーション・ジャパン-2020 大学見本市  2020.9 

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  • Assessment of climate change impact and farmer’s empirical knowledge on rice production in Cambodia with consideration of uncertainties

    Kumiko Tsujimoto, Nana Kuriya, Kotaro Ono

    2020.8 

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  • Examination of Dielectric Models in AMSR2 Soil Moisture Estimation Algorithm for Japanese and Cambodian Soils

    Kumiko Tsujimoto, Tetsu Ohta

    European Geosciences Union (EGU) General Assembly  2020.5.6 

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  • Evaluation of dielectric mixing model for wet soils for land data assimilation

    Kumiko Tsujimoto

    The Joint PI Meeting of JAXA Earth Observation Missions FY2019  2020.1.21 

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  • 大気陸面データ同化による局地循環性降水の予測精度向上に向けて Invited

    辻本久美子

    気象学会関西支部2019年度第2回例会（研究発表会）  2019.12.21 

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  • Dielectric mixing models of moist soils for microwave satellite observation of soil moisture: A theoretical analysis

    Kumiko Tsujimoto

    2019.11.4 

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  • Experimental validation of the Mironov mixing dielectric model for moist soils

    Nana Kuriya, Kumiko Tsujimoto, Mitsuru Komatsu, Tetsu Ohta, Kotaro Ono, Risa Yamamoto

    2019.10.26 

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  • Measurements of the dielectric properties of moist soils in the 0.025-4.0GHz range

    Kotaro Ono, Kumiko Tsujimoto, Mitsuru Komatsu, Tetsu Ohta, Nana Kuriya, Risa Yamamoto

    2019.10.26 

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  • スマートフォンアプリを利用した営農管理システム構築に向けて

    辻本 久美子

    第23回岡山リサーチパーク研究・展示発表会</i>  2019.2.15 

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  • スマートフォンアプリを利用した営農管理システム構築に向けて

    辻本 久美子

    成30年度岡山大学研究シーズ発信会  2018.12.4 

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  • When do rice teracces become rice terraces? International conference

    Yasushi Mori, Masaya Sasaki, Eisei Morioka, Kumiko Tsujimoto

    PAWEES-INWEPF  2018.11.21 

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  • Risk of paddy field damage due to river bank breach during serious flood International conference

    Tetsuro Tsujimoto, Kumiko Tsujimoto

    PAWEES-INWEPF  2018.11.21 

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  • Estimation of planting date in paddy fields by time-series MODIS data for basin-scale rice production modelling International conference

    Kumiko Tsujimoto, Tetsu Ohta, Yoshihiro Hirooka, Koki Homma

    PAWEES-INWEPF  2018.11.20 

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  • Calibration of Satellite Precipitation Product GSMaP with Ground Rain-Gauge Observations for Hydrological Simulations, International conference

    Kumiko Tsujimoto, Tetsu Ohta

    15th Annual Meeting of Asia Oceania Geosciences Society  2018.6 

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  • Modeling Soil Moisture for an Integrated Basin-Scale Hydrological and Agricultural Model International conference

    Kumiko Tsujimoto, Tetsu Ohta

    15th Annual Meeting of Asia Oceania Geosciences Society  2018.6 

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  • Parallel improvement of hydrological simulation and microwave satellite soil moisture observation with a unified soil water model

    Kumiko Tsujimoto, Tetsu Ohta, Yasushi Mori

    2018.3 

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  • 衛星搭載マイクロ波放射計を利用した土壌水分量推定に向けた土壌誘電率のモデル化

    辻本久美子, 森也寸志

    土壌物理学会大会  2017.10 

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  • 南スマトラ感潮湿地水田の気候変動影響評価のための作付日推定手法の検討

    辻本久美子, 太田哲, 本間香貴

    農業農村工学会大会講演会  2017.8 

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  • 農業農村工学分野における衛星降水量データの効果的な利活用に向けて

    辻本久美子

    平成29年度農業農村工学会大会講演会  2017.8 

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  • Bridging science and society for providing information on paddy water environment in Cambodia under present and future climates International conference

    Monichoth So Im, Hak Mao, Ryna Oum, Sotha Sreng, Vany, Sophy, Hak, Nara, Sovann, Khon, San, Kumiko Tsujimoto, Kentaro Aida, Tetsu Ohta, Masaki Yasukawa, Hideyuki Kamimera, Katsunori Tamagawa, Koki Homma, Toshio Koike, Masaru Kitsuregawa

    13th Symposium of International Network for Water and Ecosystem in Paddy Fields Symposium  2016.12 

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  • Land-Lake-Atmosphere Interaction under Global Climate Change and Regional Landuse Change over a Large Tropical Lake and its Vicinities: case study in Cambodia International conference

    Kumiko Tsujimoto

    Collaboration Seminar for Sustainable Environment  2016.8 

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  • Toward sustainable water resources management in Cambodia through climate-water-food integrated approach with field observation, satellite observation, and numerical model simulations International conference

    Kumiko Tsujimoto, Monichoth So Im, Toshio Koike, Kentaro Aida, Katsunori Tamagawa, Tetsu Ohta, Koki Homma, Masaki Yasukawa, Masaru Kitsuregawa

    1st Symposium on Tonle Sap Water Environment  2016.8 

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  • Observation and numerical modelling of surface fluxes over paddy around the Tonle Sap Lake Area in Cambodia International conference

    Kumiko Tsujimoto, Toshio Koike, Kenji Tanaka, Kentaro Aida, Katsunori Tamagawa, Tetsu Ohta, Koki Homma, Monichoth So Im

    International Symposium on Agricultural Meteorology  2016.3 

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  • カンボジア・トンレサップ湖周辺域における湖上と水田地帯での乱流フラックス観測

    辻本久美子, 小池俊雄, 田中健路, 会田健太郎, 玉川勝徳

    日本農業気象学会大会  2016.3 

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  • Toward application of GSMaP for the flood early warning in Asian countries International conference

    KumikoTsujimoto, Tetsu Ohta, Kentaro Aida, Petra Koudelova, Mohamed Rasmy, Patricia Ann Jaranilla-Sanchez, Toshio Koike

    Asian Water Cycle Initiative (AWCI) Symposium  2016.1 

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  • Application of GSMaP for Integrated Water Management in Asian Countries : for Flood Risk Management and Agricultural Water Resources Management International conference

    Kumiko Tsujimoto, Tetsu Ohta, Toshio Koike

    GPM workshop  2016.1 

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Awards

  • 論文賞

    2023.10   土壌物理学会  

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  • Paper Award

    2022.11   International Society of Paddy and Water Environment Engineering (PAWEES)  

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  • 水工学論文奨励賞

    2012.3   公益社団法人 土木学会水工学委員会  

    辻本 久美子

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  • 山田一宇賞

    2010.6   公益財団法人 前田記念工学振興財団  

    辻本 久美子

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Research Projects

  • Database construction and modelling of soil dielectric properties

    Grant number：23H01515  2023.04 - 2026.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    辻本 久美子

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    Grant amount：\19500000 （ Direct expense: \15000000 、 Indirect expense：\4500000 ）

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  • ダイバーシティ農業による地域イノベーション共創拠点

    2022.10 - 2023

    科学技術振興機構（JST）  共創の場形成支援プログラム  地域共創分野育成型

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  • AMSR3およびGCOM-Wを用いた全球土壌水分量に関する研究アルゴリズムの開発

    2022.04 - 2025.03

    宇宙航空研究開発研究(JAXA)  第3回地球観測研究公募 

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  • 気候変動に適応したしなやかなスマート農業水管理システムの開発

    2020.12 - 2021.03

    いであ株式会社  共同研究 

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  • Proposal of precision irrigation information by water dynamics analysis with spatial heterogeneity of leaf and soil

    Grant number：20H03099  2020.04 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    中村 公人, 中桐 貴生, 辻本 久美子

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    Authorship：Coinvestigator(s) 

    Grant amount：\16380000 （ Direct expense: \12600000 、 Indirect expense：\3780000 ）

    和歌山県有田市の果樹園における観測に加えて，大阪府立大学の敷地内のミカン樹における画像観測を実施した．有田市果樹園においては，土壌水分量，葉面温度，気象要素の経時観測に加えて，定期的なドローン撮影（熱赤外線カメラ，マルチスペクトルカメラ）と葉の水ポテンシャル，気孔コンダクタンスの計測を行った．大阪府立大学のミカン樹においては，定期的におよそ2時間間隔での葉の水ポテンシャルを観測し，そのときのRGB撮影と近赤外マルチスペクトル撮影を行い，色彩情報との関係性を検討するとともに，葉先の位置の変位を計測し，変位量との関係性の有無を調べた．その結果，葉面温度と気温の差が葉の水ポテンシャルの推定に利用できる可能性を示すことができ，葉面温度から気孔コンダクタンスを推定するモデル式を提示した．気孔コンダクタンスの観測値と計算値はおよそ適合することを示した．また，ミカン果実品質への影響度が高い9月において，RGBと葉の水ポテンシャルの相関が高いこと，葉の水ポテンシャルは葉の変位量とも関係性が見られることを明らかにした．以上より，遠隔情報を用いて葉の水ポテンシャルが推定可能であることが示唆された．水分動態解析に必要となる蒸発散量については，土壌水分量の観測値から推定し，これが葉面温度の変化の特徴と弱い関係があることを示した．
    また，昨年度に開発した，ラズベリーパイと無線LANを利用したマルチスペクトル撮影および土壌水分の多点計測を自動で行えるシステムを有田市果樹園に導入し観測を開始することができた．さらに，浸潤計を用いて土壌の浸透特性を評価することができることを確認した．

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  • Development of basin-scale water management technologies of paddy dominant watersheds using seasonal vicissitudes of Tonle Lake and its reverse import as rural technology infrastructures

    Grant number：19KK0171  2019.10 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    増本 隆夫, 吉岡 有美, 伊藤 祐二, 辻本 久美子

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    Authorship：Coinvestigator(s) 

    Grant amount：\18460000 （ Direct expense: \14200000 、 Indirect expense：\4260000 ）

    令和3年度には、前年度に引き続き湖内熱収支の検討を進め、比較的高い精度で得ることができた現地測定データを用いて潜熱量の推定法を検討した。特に、大気安定度を考慮したバルク係数モデルを用いて潜熱量の推定値を渦相関法による測定値と比較・検討した。加えて、氾濫水の地下水涵養の有無についての検討、領域気候モデル（WRF）とDWCM-AgWUモデルとのカップリングに関する基本アルゴリズムの決定ならびに組込み方法について検討した。そこでは、カンボジアへの渡航が困難であったことから、代替で日本の湖干拓により、湖面積が1/5になった八郎湖流域を取りあげで同組み込み方法の検討を行った。
    また、環境指標としての安定同位体の利用方法を明らかにした上で、トンレサップ湖や湖周辺地域での降水、湖水、河川水の定期的なサンプリングを共同研究先の水資源気象省と協力して継続して行った。ただし、同位体分析を着実かつ本格的に進めたが、コロナ禍により、共同研究者による日本へのサンプリングデータの送付が滞り、一方で日本側研究者の渡カンボジアを全く果たせなかったことから、現地訪問時の定点サンプリングもできなかった。そのため、分布型水循環モデルによる計算シミュレーションと環境指標からのアプローチを統合したネオ診断法の展開に遅れが生じた。他方、観測塔での観測は継続するとともに、気候変動実験における各種GCMの結果も入手し、独自のバイアス補正法により1～5kmのダウンスケールデータの作成を開始した。ただし、観測塔上のバッテリー等は交換補修が必要となっているが、現地訪問ができず太陽パネルが利用できない夜間の観測に支障をきたす事態の改善はできなかった。

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  • スマートフォンアプリを利用した営農管理システム構築に向けて

    2019.09 - 2020.03

    産学官融合センター研究協力会  プレ共同研究 

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    Authorship：Principal investigator 

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  • 大気陸面データ同化による降水・河川流量予測

    2019.04 - 2022.03

    宇宙航空研究開発機構（JAXA）  第2回地球観測研究公募 

    辻本 久美子

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    Authorship：Principal investigator  Grant type：Competitive

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  • 土壌の誘電特性と保水性の関係に着目した土壌水分量衛星観測アルゴリズム改良の試み

    Grant number：19K04619  2019.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    辻本 久美子

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    Authorship：Principal investigator 

    Grant amount：\4420000 （ Direct expense: \3400000 、 Indirect expense：\1020000 ）

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  • Exploring the mechanisms how soil organic matter escapes decomposition and accumulates in the terrestrial surface layer of the earth

    Grant number：17H01496  2017.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    Mori Yasushi

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    Authorship：Coinvestigator(s) 

    Grant amount：\43160000 （ Direct expense: \33200000 、 Indirect expense：\9960000 ）

    Soil is the largest terrestrial carbon sotrage and a valuable medium for plant growth, thus conservation of organic soil is essential for ecosystem stability. We found that the physical aspects of pore structure and downward infiltration are strongly related to soil organic matter, and we clarified the mechanisms of soil organic matter accumulation and loss on a watershed scale. Downward infiltration increases soil organic matter, but soil runoff, the major cause of soil degradation, has a canceling effect on it. In addition to CEC and silt content, permeability factors also play a role in the conservation of soil organic matter at the continental level, indicating the importance of physical aspects in a wide area.

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  • Degrading Process Analysis and Hydrological Estimation of Environmental Management for Rice Terraces in the Philippines.

    Grant number：17H04484  2017.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    MORI Yasushi

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    Authorship：Coinvestigator(s) 

    Grant amount：\15860000 （ Direct expense: \12200000 、 Indirect expense：\3660000 ）

    The Cordillera rice terraces in the northern part of the Philippines, known as a World Heritage, conveys the traditional culture of the region and exists as a production base for rice cropping and a part of natural water and material cycles. However, the collapse of rice terraces has become more serious, and proper and efficient farm management has been required to maintain the rice terraces.We focused on the structure of the rice terraces and the circulation of water and materials, and found that hard pan, which was formed in the lower layers of the paddy fields to store water, decided the stability of the rice terraces.There were some rice terraces with excess organic matter and the paddy can pond the water by small particle clogging without forming hard pan.If that was the case, mineral leaching occurred and stability of the paddy becomes lower.
    We can conclude that hard pan is invisible, but its formation is crucial for stable rice paddy management.

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  • Quantitative assessment of scientific knowledge on climate change and farmers' empirical knowledge through dynamic coupling of hydrologic and crop models

    Grant number：16K06503  2016.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Tsujimoto Kumiko

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    Authorship：Principal investigator 

    Grant amount：\4810000 （ Direct expense: \3700000 、 Indirect expense：\1110000 ）

    In this project, a distributed hydrological model and a crop growth model were dynamically coupled with improvements especially made on the land-surface process sub-model. The improved model was applied on a basin scale, and the impact assessment of climate change on agricultural water resources and rice production was conducted to derive the basin-scale future projection and its uncertainties (“quantitative assessment of scientific knowledge on climate change”). In addition, farmers’ empirical knowledge on agricultural management against year-to-year fluctuations in rainfall and water availability has been investigated through field surveys and remote sensing data, and its effectiveness and limitation under changing climate have been investigated. With results from these two approaches, the effective information for adaptation in agriculture under climate change has been distilled and discussed.

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  • カンボジア西部における気候変化下での水と食料の安全保障

    2014.04 - 2015.03

    宇宙航空研究開発機構（JAXA）  環境のための宇宙利用プロジェクト（SAFE） 

    辻本 久美子

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    Authorship：Principal investigator  Grant type：Competitive

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  • Toward better understanding of the mechanism of the locally-induced precipitation in Cambodia through radiosonde observation and its data assimilation for regional climate model simulation

    Grant number：25820222  2013.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)  Grant-in-Aid for Young Scientists (B)

    Tsujimoto Kumiko, KOIKE Toshio, TANAKA Kenji, TAMAGAWA Katsunori, AIDA Kentaro, OHTA Tetsu, MASUMOTO Takao, Monichoth SO IM

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    Authorship：Principal investigator 

    Grant amount：\4420000 （ Direct expense: \3400000 、 Indirect expense：\1020000 ）

    Radiosonde observation in Cambodia was conducted in this project, since there is currently no operational one. The sondes were released simultaneously from two stations in Cambodia, from paddy and from the Tonle Sap Lake. The observed data were used for the data assimilation for the regional climate model simulations with WRF, in order to clarify the mechanism of the locally-induced nocturnal precipitation over the rain-fed agricultural area at western country.
    Through the comparison with the observed precipitation both from satellite and ground, it was shown that the simulated precipitation by WRF with data assimilation has been improved even only with day-time observation data. The simulated results also showed that not only night-time phenomena but also the development of the day-time lake-breeze circulation as well as the surface heat fluxes from various land-use types over land during daytime are the key for the better estimation of the nocturnal local precipitation in this region.

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  • アジアモンスーン地域における地上レーダーと雨量計ネットワークを用いた衛星降水プロダクトの検証

    2013.04 - 2016.03

    宇宙航空研究開発機構（JAXA）  降水観測ミッションプロジェクト（PMM） 

    辻本 久美子

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    Authorship：Principal investigator  Grant type：Competitive

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