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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Acknowledgments
We wish to thank the Mekong River Commission, Ministry of Water Resources and Meteorology and Public Works Ministry of Cambodia, for their extensive assistance in providing necessary data for this research. This research was supported by Japan Fund for Global Environment through JSIDRE. We are also grateful to Dr Kenji Suzuki and Dr Jun Furuya of the JIRCAS for their kind assistance for this research.
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Khem, S., Goto, A. & Mizutani, M. 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. Paddy Water Environ 6, 285–298 (2008). https://doi.org/10.1007/s10333-008-0126-x
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DOI: https://doi.org/10.1007/s10333-008-0126-x