How does the consideration of bedrock groundwater change model estimation of runoff, water retention, and permeability?

DOI
  • Kameyama Toshiaki
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Kumagai Tomo'omi
    Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Egusa Tomohiro
    Faculty of Agriculture, Shizuoka University
  • Momiyama Hiroki
    Department of Disaster Prevention, Forestry and Forest Products Research Institute, Forest Research and Management Organization

Bibliographic Information

Other Title
  • 基岩地下水の考慮で流出・保水性・透水性のモデル推定はどう変わるのか？

Abstract

<p>How does the consideration of bedrock groundwater in a distributed model change the accuracy of runoff reproduction, the estimation of water retention and permeability in a watershed, and their uncertainties? To answer this question, we first developed a physical distributed model that explicitly accounts for soil and bedrock. Then, numerical experiments were conducted in the Oborasawa, a 49.4-ha forest headwater catchment in the Tanzawa mountains, in the Kanto region of Japan, comparing the results of the two models, one with and one without bedrock. The results showed that the accuracy of reproduction at low flow was enhanced, although the accuracy of reproduction at high flow was not always enhanced by considering bedrock groundwater. In addition, the estimated water retention and permeability of soil differed depending on whether bedrock groundwater was considered or not, implying that lower permeability was estimated, especially if soil alone was used to reproduce low flows.</p>

Journal

Keywords

Details 詳細情報について

  • CRID
    1390017193115819904
  • DOI
    10.11520/jshwr.36.0_394
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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