下切侵蚀 down-cutting
downcut
- 坝地淤积,抬高了侵蚀基准面,可以防止沟道下切和沟岩扩张;
Silting in dams raise the erosion base. This can prevent guilybed from cutting down, and banks from expanding; - 结果表明:(1)三峡坝区河谷深槽是在三峡地区构造抬升过程中,水流顺构造裂隙强烈侵蚀下切而形成的;
The deep troughs on the Three Gorges valley bottom are formed by river downcutting along the structurally zones on the background of regional tectonic uplift. - 阐明了在浅沟发育初期、中期和后期三个发育阶段,沟头溯源侵蚀、沟壁扩展和沟床下切侵蚀变化规律。
The change of ephemeral gully headward erosion, gully-wall collapsing and deep-cutting erosion were quantified in the three stages of initial-phase, metaphase and anaphase.
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