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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >A demonstration of the importance of bedload transport for fluvial bedrock erosion and knickpoint propagation
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A demonstration of the importance of bedload transport for fluvial bedrock erosion and knickpoint propagation

机译：论证了基床运输对河流基岩侵蚀和拐点传播的重要性

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摘要

We provide field evidence for the role of bedload in driving fluvial incision and knickpoint propagation. Using aerial photographs, field surveys, and hydrological data, we constrain the incision history of a bedrock gorge 1200m long and up to 20m deep cut by Da'an River in western Taiwan. This reach of the river experienced 10m of uplift during the 1999 Chi-Chi earthquake. For five years following the earthquake, bedload was prevented from entering the uplift zone, the knickpoint was static and little incision took place. Bedload transport across the uplift zone resumed in 2004, initiating extremely rapid incision, with 620m of knickpoint propagation and up to 20m of downcutting by 2008. This change highlights the relative inefficiency of suspended sediment and the dominant role of bedload as a tool for fluvial erosion and knickpoint propagation. Once bedload tools became available, knickpoint propagation was influenced by geological structure, lithology, and drainage organization. In particular, a change in dip of the sandstone beds at the site caused a decrease of knickpoint propagation velocity.
机译：我们提供床载在驱动河流切口和拐点传播中的作用的现场证据。利用航拍照片，野外调查和水文数据，我们限制了台湾西部大安河长1200m，深达20m的基岩峡谷的切开历史。在1999年的Chi-Chi地震中，这条河段经历了10m的隆起。地震后的五年中，阻止了床载进入隆起区，拐点保持静止，几乎没有切口。 2004年恢复了横跨隆起带的基床运输，开始了极快的切割，到620m的拐点传播，到2008年下降了20m。这一变化突显了悬浮泥沙的相对效率低下以及基床作为河流侵蚀工具的主导作用和拐点传播。一旦有了床载工具，拐点传播就受到地质结构，岩性和排水构造的影响。特别地，在该地点的砂岩床倾角的变化引起拐点传播速度的降低。

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