Development of a distributed water circulation model for assessing human interaction in agricultural water use

T. Masumoto, T. Taniguchi, N. Horikawa, T. Yoshida, K. Shimizu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

This paper describes the development of a distributed water circulation model that characterizes and assesses human interaction in unique water uses for agriculture in the Mekong River Basin. A high proportion of water is used for agriculture in Monsoon Asia given the various types of paddy irrigation utilized there, and the distinct dry and wet seasons. The proposed model incorporates those characteristics and reproduces the mechanism of the water cycle in that region. The use of agricultural water in rain-fed paddies of the basin is first classified as three types of practices: using only rainfall, temporarily using supplementary water, and using floodwater. Irrigated paddies are also classified into six types based on the major types of irrigation and facilities employed. Secondly, the model consists of four sub-models used to calculate potential evapotranspiration, simulate cropping patterns and planting/harvesting areas, estimate the use of agricultural water, and analyze runoff components, respectively. Thirdly, actual evapotranspiration is estimated based on estimated water content in the root zone, one of the three layers modeled. Finally, model simulation was conducted for the years 1999 through 2003 and volumes of calculated discharge were compared with observed data at key points in the basin, showing a high degree of accuracy.

Original languageEnglish
Title of host publicationFrom Headwaters to the Ocean
Subtitle of host publicationHydrological Changes and Watershed Management - Proc. of the International Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCHAN 2008
Pages195-201
Number of pages7
Publication statusPublished - Dec 1 2009
Externally publishedYes
EventInternational Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCHANGE 2008 - Kyoto, Japan
Duration: Oct 1 2008Oct 3 2008

Publication series

NameFrom Headwaters to the Ocean: Hydrological Changes and Watershed Management - Proceedings of the International Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCH

Other

OtherInternational Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCHANGE 2008
CountryJapan
CityKyoto
Period10/1/0810/3/08

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All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Ocean Engineering
  • Water Science and Technology

Cite this

Masumoto, T., Taniguchi, T., Horikawa, N., Yoshida, T., & Shimizu, K. (2009). Development of a distributed water circulation model for assessing human interaction in agricultural water use. In From Headwaters to the Ocean: Hydrological Changes and Watershed Management - Proc. of the International Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCHAN 2008 (pp. 195-201). (From Headwaters to the Ocean: Hydrological Changes and Watershed Management - Proceedings of the International Conference on Hydrological Changes and Management from Headwaters to the Ocean, HYDROCH).