A generalized method for assessing inter-levee floodplain pond environments focused on unionid mussels.

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  • NAGAYAMA Shigeya
    Aqua Restoration Research Center, Public Works Research Institute River Basin Research Center, Gifu University Civil Engineering and Eco-technology Consultants Co., Ltd.
  • KATO Yasumitsu
    Civil Engineering and Eco-technology Consultants Co., Ltd.
  • MIYAWAKI Shigenari
    Civil Engineering and Eco-technology Consultants Co., Ltd.
  • HARADA Morihiro
    River Basin Research Center, Gifu University
  • KAYABA Yuichi
    Water Environment Research Group, Public Works Research Institute

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  • イシガイ類に着目した河道内における氾濫原水域環境の汎用的評価手法の検討
  • イシガイルイ ニ チャクモク シタ カドウ ナイ ニ オケル ハンラン ゲンスイイキ カンキョウ ノ ハンヨウテキ ヒョウカ シュホウ ノ ケントウ

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Abstract

<p>To develop a generalized method for the primary assessment of inter-levee floodplain pond environments in large Japanese lowland rivers, a generalized prediction model for freshwater mussel occurrence was built, and an application method for river management was suggested. Mussels were present in all of nine study rivers. Mussels occurred in 73 of the 363 surveyed ponds, at 1 to 21 ponds in each river. The probability of mussel occurrence was predicted using the relative height and area of each pond, with hump-shaped and positive relationships with mussel occurrence, respectively. As an example to demonstrate its application to river management, a floodplain assessment figure with a form similar to that of the discharge capacity figure, was created for the Kiso River.</p>

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