Articles | Volume 370
Proc. IAHS, 370, 39–44, 2015
https://doi.org/10.5194/piahs-370-39-2015
Proc. IAHS, 370, 39–44, 2015
https://doi.org/10.5194/piahs-370-39-2015

  11 Jun 2015

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 Y. Shimizu et al.
  • 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.

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Short summary
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.