Effects of Spatial Scales on Runoff/Sediment Transport in Mountain Catchments (4): Avenues for Prediction Improvement

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  • UCHIDA Taro
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • ASANO Yuko
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • HIRAOKA Marino
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • YOKOO Yoshiyuki
    Faculty of Symbiotic Systems Science, Fukushima University
  • GOMI Takashi
    Graduate School of Agriculture, Tokyo University of Agriculture and Technology
  • MIZUGAKI Shigeru
    Civil Engineering Research Institute for Cold Region, Public Works Research Institute
  • NIWA Satoshi
    Japan Conservation Engineers & Co., Ltd.
  • KATSUYAMA Masanori
    Graduate School of Life and Environmental Science, Kyoto Prefectural 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（4）：水・土砂流出予測精度向上に向けた提案
  • 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(4)ミズ ・ ドシャ リュウシュツ ヨソク セイド コウジョウ ニ ムケタ テイアン

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Abstract

<p>　To improve the prediction accuracy of numerical simulation models of water and sediment transport phenomena in mountainous catchments, we discuss extraction methods of the governing processes, and important site conditions and external forces affecting the governing processes. Results show a relationship between catchment area and water and sediment discharges, as derived from observations conducted at multiple locations within a catchment, can be typed according to differences in the spatial distribution of governing processes and controlling conditions. Elucidating relations between the catchment area and water and sediment discharges at multiple locations within the catchment might reveal the governing processes and controlling conditions of water and sediment transport phenomena. Based on these analyses, we discussed issues and approaches reflecting the observed information related to the spatial distribution of water and sediment discharge in the numerical prediction models. Results revealed (1) the importance of longitudinal observations at multiple streams in a catchment for ascertaining characteristics of the spatial distribution of water and sediment discharges. This study also clarified (2) the importance of cataloging spatial distribution of site conditions and, (3) processes that are and are not be expressible solely by topography, Furthermore, we argued (4) a method of modelling processes that cannot be determined solely by topography.</p>

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