DEVELOPMENT OF A RIVERBED VARIATION MODULE TO PREDICT SAND COVER RATE FOR THE FORAGING HABITAT OF AYU FISH

DOI Web Site 7 References
  • MIZOGUCHI Yuta
    土木研究所 水環境研究グループ河川生態チーム
  • USAMI Shohei
    筑波大学 大学院理工情報生命学術院システム情報工学研究群（研究当時：埼玉大学 工学部建設工学科）
  • YAGISAWA Junji
    埼玉大学 大学院理工学研究科
  • ONODA Yukio
    応用地質株式会社 応用生態工学研究所
  • TASHIRO Takashi
    名古屋大学 減災連携研究センター
  • MIYAGAWA Yukio
    土木研究所 水環境研究グループ自然共生研究センター
  • NAKAMURA Keigo
    土木研究所 水環境研究グループ河川生態チーム

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Other Title
  • アユの採餌環境を対象とした河床環境数値予測モジュールの開発

Abstract

<p> Sand cover rate (SCR) is an important factor to explain the foraging habitats of ayu (Plecoglossus altivelis). Hence, a module of riverbed variation in a gravel-bed river with bimodal sediments was developed. The module calculated SCR, and the changes in SCR were defined as being driven by sand transport in the form of a suspended load that is deposited on stones (e.g., cobbles or pebbles) and in the interstices of stones. The prediction accuracy was examined by comparing the calculated SCR with the SCR measured in the field. The results showed that the spatial pattern of sand deposition/erosion predicted by the module was almost close to the measured one, though the predicted SCR tended to be higher/lower than the measured value. Chronological changes in the SCR calculated by the module suggested that sand deposits started forming along shorelines after the peak of a flood and then expanded toward the centers of the flow in channels in the end stage.</p>

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