An evaluation method of water resources in paddy regions to preserve ecological environments
2004
Masumoto, T. (National Inst. for Rural Engineering, Tsukuba, Ibaraki (Japan)) | Kubota, T. | Matsuda, S. | Takagi, A.
Summary Agricultural water and agriculture itself possess the functions of water resources preservation in that agricultural production activities using those resources contribute to the preservation of ecosystems. In addition, there is a strong possibility that sound and sustainable maintenance and/or preservation of water resources functions, such as biodiversity of ecosystems, lead up to the viability of rural areas. In order to clarify its cause and effect relation among them, in particular, it is important to understand the characteristics of ecosystems that are preserved by the water-use environments and to verify the relation of those ecosystems with those water-use environments in rural areas. This paper, therefore, aims at examining hydrologic factors such as discharges and velocities in irrigation and drainage channels in rural areas and the actual conditions of fish ecosystems in the areas under status quo and, based on the outcomes of those investigations, proposes to develop an evaluation method of water resources function by using of hydrologic indices. Especially, as the target of paddy areas in low-lying agricultural region, the results of hydrologic conditions and the surveys on fish ecosystems are presented and those of evaluation methods using hydrologic indices and the mapping methods of channel networks to explain water resources functions of the target areas are discussed.
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