Hood discharge from high dam in Karst terrain might easily destroy the Karst slope with strong erosion, and available evidences of water abrasion at Wujiangdu reflected the unbalanced relation between flood intensity and erosion resistance of Karst slope. The paper generalized two main characteristics of the hydrodynamic erosion: ( 1 ) the soft terrains between rock layers might be undercut by high speed flood firstly, and no obvious abrasion was from the compact surface of carbonate rocks; (2) the vertical rocks could not keep its stability without the groundwork supported, and landslip would occur with the flood erosion. For the different hydrodynamic erosion, it is necessary to reinforce the Karst slope with hydraulic engineering, especially for the terrane parts, such strategy may facilitate a relative stability for the riverway.%贵州乌江渡的水力冲蚀迹象表明,高坝泄洪容易破坏喀斯特岸坡的稳定性,泄洪强度与岸坡地质抗冲蚀能力之间的不均衡关系,则是导致岸坡形貌发生剧变的根本原因.据分析,乌江渡水力冲蚀作用具有两个特点:(1)高速洪流强烈冲蚀并淘空岩层间质地比较松软的填充质,但致密的碳酸盐岩表面受此影响不明显;(2)竖立产状的岩层逐渐失去填充质的承重基础支撑,在洪流的强力冲涌下,突兀的岩体势必失稳并引起岸坡崩塌.因此,根据不同河段的水力冲刷强度,采取工程防护措施增强填充质的抗冲蚀力度,有助于保持河道及岸坡的相对稳定性.
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