The erosion process of rivers. When the riverbed is sufficiently higher than the erosion base level, it mainly performs undercutting (scours the riverbed), and when it gets close to the erosion base level, it performs sidecutting (widening the valley floor). The process of extending the river valley upstream is called valley head erosion. → Related Articles River Terraces | Erosion Source : Heibonsha Encyclopedia About MyPedia Information |
河の行う浸食作用。河床が浸食基準面より十分高い場合おもに下刻(河床を洗掘)を行い,浸食基準面に近くなると側刻(谷床を広げる)を行う。また,河谷を上流方向へ延長する作用を谷頭浸食という。 →関連項目河岸段丘|浸食作用 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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