人為的な植物の除去とメアンダーカットオフへの急速な地形的調整:低地メアンダー川からの証拠
Katarina Pavlek1, Ronald E Poeppl2, Tomáš Galia3
1Chair of Photogrammetry and Remote Sensing, Faculty of Geodesy, University of Zagreb, Zagreb, Croatia.
The Science of the total environment
|September 2, 2025
まとめ
岸辺の植生を除去することで 川岸の浸食とオルヤヴァ川の運河の拡大が劇的に増加しました 川岸の安定化と 曲がりくねった川の洪水リスクを軽減するために 植生を再生することが重要です
科学分野:
- 河川の形態動力学と河川の地形学
- 環境科学と水学
- 人間が河川に及ぼす影響
背景:
- 人間の干渉により 川の動態が大きく変化し 侵食や洪水のリスクが増加します
- 植物の除去に対する河川の反応に関する長期的,広範囲の研究は稀です.
- 岸辺の植生は川の形態動力学において重要な役割を果たします.
研究 の 目的:
- オーリャヴァ川の 55 年の経路の変化を調べるため
- 2011年の川の洪水への対応を評価する.
- 横移動率に影響を与える要因を特定する.
主な方法:
- チャンネル形態測定のための航空画像,オーソフォト,地形図の分析.
- 横移動率に影響を与える要因を分析するための線形混合モデル.
- 洪水の規模,持続時間,沿岸の植生,運河の幾何学に関するデータ収集
主要な成果:
- 横移動率の4倍の増加と,植物の除去後に観察された運河の幅の40%の増加.
- 移動率は沿岸の植生層と負の相関関係にある.
- 移動率は,地形的に有効な放出時間,チャネルの傾き,および幅と正に相関しています.
結論:
- 岸辺の植生を人為的に除去することは,岸辺の侵食と運河の移動の増加の主な要因です.
- 川岸の安定化と 浸食と洪水のリスクを軽減するために 川岸の植生を再生することが不可欠です
- 河川の自然流域の保全は 地質学的多様性と運河の安定性を高めることができる.
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