Effects of Spatial Scales on Runoff / Sediment Transport in Mountain Catchments (2) -Results from Intensively Studied Catchments

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  • ASANO Yuko
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • UCHIDA Taro
    National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism
  • KATSUYAMA Masanori
    Graduate School of Agriculture, Kyoto University
  • HIRAOKA Marino
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • MIZUGAKI Shigeru
    Civil Engineering Research Institute for Cold Region, Public Works Research Institute
  • GOMI Takashi
    Graduate School of Agriculture, Tokyo University of Agriculture and Technology
  • NIWA Satoshi
    Japan Conservation Engineers & Co., Ltd.
  • YOKOO Yoshiyuki
    Faculty of Symbiotic Systems Science, Fukushima University

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Other Title
  • 山地流域の水・土砂流出における空間スケールの影響（2）：集中的な観測が行われた流域の事例
  • サンチ リュウイキ ノ ミズ ・ ドシャ リュウシュツ ニ オケル クウカン スケール ノ エイキョウ(2)シュウチュウテキ ナ カンソク ガ オコナワレタ リュウイキ ノ ジレイ

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Abstract

<p>　Findings for spatial patterns of runoff and sediment transport at selected observation sites were summarized to elucidate processes controlling scale dependence and spatial heterogeneity of their catchment areas. We selected Fudoji and Kiryu watersheds in Shiga for runoff generation and Tanzawa in Kanagawa and Saru watersheds in Hokkaido for sediment transport. Regarding runoff generation, variation of concentration of specific chemical species (i.e. silica) suggested various flow paths from weathered bedrock layer to soil layer in small catchments, although variation tapered with increased catchment area because of the mixing of several flow components. Sediment transport also varied spatially depending on the catchment characteristics. Variation tapered with increased catchment area. Moreover, increased storage components and decreased ratios of sediment source areas to the total catchment area for larger drainage areas decreased the sediment transport with catchment areas in some catchments. Landscape legacies of sediment supply, storage, and transport can contribute to increased sediment yields in larger catchments.</p>

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