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Proceedings of the International Association of Hydrological Sciences An open-access publication for refereed proceedings in hydrology

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Proc. IAHS, 370, 39-44, 2015
https://doi.org/10.5194/piahs-370-39-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
11 Jun 2015
Impact analysis of the decline of agricultural land-use on flood risk and material flux in hilly and mountainous watersheds
Y. Shimizu1, S. Onodera2, H. Takahashi3, and K. Matsumori3 1JSPS Research Fellow, Western Region Agricultural Research Centre, National Agriculture and Food Research Organization, Fukuyama, Japan
2Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Japan
3Western Region Agricultural Research Centre, National Agriculture and Food Research Organization, Fukuyama, Japan
Abstract. Agricultural land-use has been reduced by mainly urbanization and devastation in Japan. The objective of this study is to evaluate the impact of the decline of agricultural land-use on flood risk and material flux in hilly and mountainous watersheds using Soil Water Assessment Tool. The results indicated that increase of flood risk due to abandonment of agricultural land-use. Furthermore, the abandonment of rice paddy field on steep slope areas may have larger impacts on sediment discharges than cultivated field. Therefore, it is suggested that prevention of expansion of abandonment of rice paddy field is an important factor in the decrease of yields of sediment and nutrients.

Citation: Shimizu, Y., Onodera, S., Takahashi, H., and Matsumori, K.: Impact analysis of the decline of agricultural land-use on flood risk and material flux in hilly and mountainous watersheds, Proc. IAHS, 370, 39-44, https://doi.org/10.5194/piahs-370-39-2015, 2015.
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The objective of this study is to evaluate the impact of the decline of agricultural land-use on flood risk and material flux in hilly and mountainous watersheds using Soil Water Assessment Tool. The results indicated that increase of flood risk due to abandonment of agricultural land-use. Furthermore, the abandonment of rice paddy field on steep slope areas may have larger impacts on sediment discharges than cultivated field.
The objective of this study is to evaluate the impact of the decline of agricultural land-use on...
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