Effect of Geomorphological Factors of Small Catchments on Peak Discharge at Confluence Points

DOI HANDLE 被引用文献2件 オープンアクセス
  • 笠井 美青
    九州大学農学部林学科環境システム学講座 | 九州大学農学部林学科林学第三講座
  • Fujino Takako
    Laboratory of Silviculture, Faculty of Agriculture, Kyushu University
  • 丸谷 知己
    九州大学農学部林学科環境システム学講座 | 九州大学農学部林学科林学第三講座

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Effect of geomorphological factors of small branch catchments on the peak discharge of a main channel at confluence points was analyzed from the observation of discharge and the measurement of geomorphology. Catchment area, catchment shape, channel gradient, bifurcation ratio and length ratio of branch catchments were acquired from 1/25000 topographical map. A hydrograph appeared during a flood changed according to the catchment shape, represented by the bifurcation ratio and the length ratio. The effect of the channel gradient on the discharge was little in small catchments (from 0.859 km^2 to 0.945 km² in area). A sum of peak values of discharge of branch catchments equaled to a peak value of discharge in main channel. Peaks in the hydrography curve of branch catchments often coincided to those of main channel. In the case that confluence points departed about 300 m in distance, the peaks disappeared in the hydrography curve.

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詳細情報 詳細情報について

  • CRID
    1390290699660921344
  • NII論文ID
    110000017809
  • NII書誌ID
    AA00247166
  • DOI
    10.5109/24083
  • HANDLE
    2324/24083
  • ISSN
    00236152
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • IRDB
    • Crossref
    • CiNii Articles

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