低ダム群工法の魚道機能に関する研究

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タイトル別名
  • Study on Fishway Function of the Method of Low Dams Series
  • テイ ダムグン コウホウ ノ ギョドウ キノウ ニカンスルケンキュウ

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Fishway function of low dams series was studied in Shiretoko Peninsula, Hokkaido. In three sets of the low dams series, pool depth, head (vertical drop between top of a dam and surface of pool formed just below the dam) and total fall (sum of the depth and the head) were measured. Total fall varies in accordance with fluctuation of stream bed elevation nearby. When total fall is constant, pool depth and head greatly fluctuate. Low dams series thereby can be a barrier to upstream passage for fish. Installing a trapezoid notch to a low dam is efficient for reducing head temporarily. However, degradation of the stream bed possibly causes expansion of total fall and head. In order to ensure fish passage, structure of dam should be modified as follows. Fixation of channel course by making a cut with enough width and depth for flood passage is required. Installation of auxiliary dam is still effective where the next downstream dam prevents excessive degradation of the stream bed. Making downstream slope of a dam gentle and extending it into the stream bed would help fish passage.

収録刊行物

  • 砂防学会誌

    砂防学会誌 50 (5), 43-50, 1998

    Japan Society of Erosion Control Engineering

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