Faculty Profiles - TSUJIMOTO Kumiko

Papers - TSUJIMOTO Kumiko

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Validation of AMSR2 and SMOS soil moisture products with worldwide in-situ observations from 2012 to 2020 Reviewed

Kumiko Tsujimoto, Tetsu Ohta

The Journal of Japan Society of Civil Engineers 2024

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

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

Kumiko Tsujimoto

Journal of JJSCE 2023

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

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

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

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

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

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

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

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

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

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

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

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

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

Tetsuro Tsujimoto, Kumiko Tsujimoto

proceedings of PAWEES-INWEPF 2018

When do rice terraces become rice terraces? Reviewed

Yasushi Mori, Masaya Sasaki, Eisei Morioka, Kumiko Tsujimoto

proceedings of PAWEES-INWEPF 2018

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

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

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

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

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

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

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

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

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

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

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

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

DOI： 10.1002/jgrd.50547

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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Papers - TSUJIMOTO Kumiko