Evaluation of a re-meandering project in the Shibetsu River from an aspect of primary production process.

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  • KAYABA Yuichi
    Aqua Restoration Research Center, Public Works Research Institute
  • NOZAKI Kentaro
    School of Education, Sugiyama Jogakuen University
  • KAWAGUCHI Yôichi
    Division of Ecosystem Design, Institute of Technology and Science, The University of Tokushima
  • MINAGAWA Tomoko
    Aqua Restoration Research Center, Public Works Research Institute

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  • 標津川の再蛇行化が一次生産過程に及ぼす影響の評価
  • シベツガワ ノ サイダコウカ ガ 1ジ セイサン カテイ ニ オヨボス エイキョウ ノ ヒョウカ

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Abstract

A re-meandering project was implemented for the stream eco-system restoration of the Shibetsu River, Hokkaido Island, the northern part of Japan. It has been well known that the alteration of planview has an influence on stream structure such as pools and riffles, but there is only a little knowledge about changes in the energy flow of stream ecosystems. The present study evaluated the alteration of primary production rate brought by the re-meandering project comparing a re-meandering section with an upstream straight section. The single station diel O2 curve method and the light and dark bottle method were applied for the measurement of primary production rate, and both methods indicated that primary production rate was higher in the re-meandering section than the straight section. The analysis of factors determining primary production rate showed that the standing crop of epilithic algae was lower in the straight section than the re-meandering section. The field observation gave the different view of lateral distribution of bedload transport between two sections: bedload transport in the straight section was considerably uniform across the channel, whereas it was heterogeneous and the transport was limited to the small area of the re-meandering section. Previous studies show that bedload distribution tends to be skewed in curved channels and the frequent collision of bedload particles with substrate leads to the standing crop reduction of epilithic algae. From these findings, we concluded that infrequent dislodgement of epilithic algae induced by the re-meandering treatment with small bedload area resulted to the high standing crop and it enhanced the primary production rate of the re-meandering section.

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