Measurement and Evaluation of the Flood Mitigation Capacity in Dry Terrace Field

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  • TSUJI Hideki
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • SHIOZAWA Sho
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • NISHIDA Kazuhiro
    Graduate School of Agricultural and Life Sciences, The University of Tokyo

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Other Title
  • 台地畑流域における洪水緩和機能の測定と評価
  • ダイチバタケ リュウイキ ニ オケル コウズイ カンワ キノウ ノ ソクテイ ト ヒョウカ

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In order to figure out the rainfall-runoff mechanism and evaluate the flood mitigation capacity of dry terrace field, we measured precipitation, discharge and groundwater table in a dry terrace field catchment in Choshi city, Chiba. Surface runoff was generated by excess of infiltration capacity when peak precipitation intensity was over 8 mm·(10 min)-1. Unless the surface runoff was generated, the peak specific discharge was reduced to 8-39% of the peak precipitation intensity. The groundwater table at the upper terrace rose 2-3 times a year, on the other hand, the groundwater table at the lower terrace rose up to the surface several times a year. Finally, we created Tank model, which represents the characteristic of discharge in the catchment, and we evaluated the flood mitigation capacity of this field by the infiltration capacity and the peak relaxation time “τ50”. The τ50 of this dry terrace field was 6.4 h, and this value was larger than 5.1 h in the irrigated paddy field and smaller than 8.4 h in the non-irrigated paddy field in Tsukubamirai city, Ibaraki.

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