Determination of the potential land for securing double-rice cropping in the Cambodian Mekong Delta,based on a sub-area based modeling of flood inundation |
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Authors: | Sothea Khem Akira Goto Masakuzu Mizutani |
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Affiliation: | (1) Crop Production and Environment Division, Japan International Research Center for Agricultural Science (JIRCAS), 1-1 Ohwashi, Tsukuba Ibaraki, 305-8686, Japan;(2) Faculty of Agriculture, Utsunomiya University, 350 Mine-machi, Utsunomiya Tochigi, 321-8505, Japan |
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Abstract: | Inundated areas of the Mekong Delta are the most important regions for agricultural production in both Cambodia and Vietnam. With population growth and increasing water demand in the dry season, effectively managing available water in the region is vital for crop production. This study is aimed at developing a sub-area based modeling of flood inundation model in order to analyze flood inundation processes in the Cambodian Mekong Delta as a basis for introducing semi-flood control for new cropping systems such as double-rice cropping. The simulated results of the flood inundation model from 2002 to 2003 were utilized for estimating land appearance in the dividing sub-area, and the potential of securing land for double-rice cropping was determined based on the period of land appearance and the cropping schedule. In order to realize the available water for double cropping, consideration of the effect of operating canal gates for controlling the early and receding inundation are crucially necessary. By considering the operation of control gates facilities, the potential land for securing double-rice cropping exceeded about 50 km2 compared to the 34 km2 of the actual land used for recession rice (about 30 and 20% of the total selected area, respectively). The study confirms that the sub-area based modeling of inundation model can be a helpful tool for water management in the Cambodia Mekong Delta. |
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Keywords: | Sub-area based modeling Flood inundation Double-rice cropping Semi-flood control The Cambodian Mekong Delta |
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