THE EFFECT OF BRANCHED CHANNEL MAINTENANCE ON RIVER CHANNEL EVOLUTION DURING FLOODS
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- SUMITOMO Keizo
- 株式会社ドーコン 河川環境部
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- WATANABE Yasuharu
- 北見工業大学 工学部社会環境工学領域
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- IZUMI Norihiro
- 北海道大学 工学研究科
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- YAMAGUCHI Satomi
- 土木研究所 寒地土木研究所
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- YONEMOTO Mitsuaki
- 国土交通省 北海道開発局 帯広開発建設部 治水課
Bibliographic Information
- Other Title
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- 出水時の河道変化に対する分岐流路維持の効果
- シュッスイジ ノ カドウ ヘンカ ニ タイスル ブンキ リュウロ イジ ノ コウカ
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Abstract
<p> The river channel of Satsunai River is currently covered with forest, and we have been aiming to regenerate its gravel bar through induction of disturbances. In order to do so, we have been excavating to maintain the branched channel by connecting it to the old watercourse left in the forest. It was under such circumstance that the largest flood in history occurred in August, 2016. The changes in the river channel during the flood has proven that maintenance of the branched channel by excavating to connect it to the old watercourse is effective in promoting regeneration of the gravel bar during floods. Furthermore, by calculating the changes in the riverbed, we demonstrated that maintaining branched channel to the center of the river channel could promote riverbed change in the branched channel, which can be expected to suppress erosion towards the embankments during the flood. Additionally, in terms of coping methods to new challenges such as early regeneration of vegetation due to decline in the frequency of disturbances caused by growth of the relative height difference of water surfaces, and the increased risk of river bank failure due to increased erosion of the embankments, we also demonstrated that digging branched channel to the gravel bar in the riffle area can be expected to renew disturbances in the gravel bar, and reduce erosion of the embankments.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74 (5), I_1003-I_1008, 2018
Japan Society of Civil Engineers
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Details 詳細情報について
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- CRID
- 1390283659825998080
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- NII Article ID
- 40021752358
- 130007757716
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- NII Book ID
- AN10426673
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- ISSN
- 18808751
- 2185467X
- 09167374
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- NDL BIB ID
- 029394359
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed