循環灌漑地区における降雨の有効利用に関する研究

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This paper presents the water management and the actual condition of rainwater use on paddy fields in low-lying areas when using a cyclic irrigation system. The investigated area consists of low-lying land (574ha) and sand hills (1,731ha) in the Hirataki District, West-Tsugaru Region, Aomori Prefecture. The amount of irrigation water in the Tsugaru area is not enough to provide water necessary for rice planting during the irrigation period. Because almost no irrigation water of the Hirataki District is supplied from other areas, this area mainly depends on re-used drainage water and rain water stored in ponds and in drainage canals. Therefore, the dependence rate on rain water and the ratio of re-used drainage water is very high. The average values of the recycled irrigation water ratio to the total amount of irrigation water and drainage water over 19 years (1986 through 2004) are calculated as 82% and 74% respectively. The average values of the rainwater utilization ratio from the viewpoint of irrigation factors and drainage factors over 19 years are 105% and 72%. To maximize the use of rainwater, the pumped irrigation water in this area is stopped very quickly after the beginning of rainfall. Moreover, additional drainage discharge by rainfall is very low. The amount of stored rainwater that does not drain from this area to the river system may be re-used as irrigation water. It can be concluded that the rainwater utilization ratio is influenced by the rate of rainfall to evaporation during the irrigation period, and by the ratio of recycled irrigation water. This cyclic irrigation system in low-lying paddy areas need not have a bad effect on the surrounding environment and rivers. Moreover, the water management system in this area provides an effective case study of sustainable agriculture and presents one method to cope with dwindling water resources in the future.
日本雨水資源化システム学会の論文

循環灌漑地区における降雨の有効利用に関する研究

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