メコン川流域における農地水利用の分類とマップ化(<特集>海外地形調査におけるGIS/RSの活用)

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Water use in Monsoon Asia is characterized by a large share of agricultural use, various types of paddy rice irrigation and coexistence of distinct dry and wet seasons. However, the water cycle mechanism and the effects of its change on food production have not yet been fully understood due to the limited amount of data of land use, climate, and hydrological conditions. Several water-food models at the global scale are available; however, they utilize an over-simplified algorithm to simulate water demand and yields for paddy rice areas. This study, therefore, highlights the necessity of developing an agricultural wateruse model based on analyses of water use in rain-fed paddies in the lower Mekong River Basin. First, the relationship between yields of rain-fed paddy rice and rainfall amounts is examined. Subsequently, the water use by paddies in the flooded areas in Cambodia is also analyzed. Based on the results obtained, rain-fed paddy fields are categorized into three types: fields maintained only by rainfall, fields with supplementary water supply, and fields with flood water supply. In addition, irrigated fields are also categorized into six types based on irrigation types and facilities: gravity irrigation, pump irrigation, reservoir supply, Colmatage system, tidal irrigation, and groundwater use. Agricultural lands in the Mekong River Basin are then mapped with a resolution of 0.1 degree based on the above categories.
日本地形学連合の論文
2006-04-25

メコン川流域における農地水利用の分類とマップ化(<特集>海外地形調査におけるGIS/RSの活用)

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