Riverbank erosion is a common natural river process that threatens the security of instream structures, as well as public and private property. In this study, two sets of tests were performed (direct shear tests and flume tests) to study the effects of riverbed soil composition on the stability of riverbanks. The results of the direct shear tests demonstrated that the riverbank material became increasingly cohesive with increasing clay content and decreasing water content. The internal friction angle decreased monotonically with increasing clay content, but increased towards a peak value, before decreasing thereafter, with increasing water content. The results of the flume tests showed that, for each riverbank material, an increase in bed mobility (non-cohesive bed material > cohesive bed material > fixed bed) increased the equilibrium channel width, riverbank erosion volume and bed degradation. In the first 25 min of the test, the temporal channel width was greater when the bed mobility was lower; after 45 min, the temporal channel was wider when the bed mobility was higher. For each bed material, the riverbank erosion volume and temporal channel width were greater with a non-cohesive bank than with a cohesive bank.

中文翻译：

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河床组成对河岸侵蚀过程影响的试验研究

河岸侵蚀是一种常见的自然河流过程，威胁着河道结构以及公共和私有财产的安全。在这项研究中，进行了两组测试（直接剪切测试和水槽测试），以研究河床土壤成分对河岸稳定性的影响。直接剪切试验的结果表明，随着黏土含量的增加和水含量的降低，河岸材料变得越来越粘聚。内摩擦角随粘土含量的增加而单调减小，但随着峰值的增加而增大，然后随含水量的增加而减小。水槽测试的结果表明，对于每种河岸材料，床的迁移率都有所增加（非粘性床材料>粘性床材料> 固定河床）增加了平衡河道宽度，河岸侵蚀量和河床退化。在测试的前25分钟，当床的流动性较低时，时间通道宽度较大；45分钟后，当床的移动性较高时，颞通道更宽。对于每种河床材料，非粘性河岸的河岸侵蚀量和时间河道宽度大于粘性河岸。