We conducted flume experiments to study the morphological behaviour around a circular pier located downstream of a mining pit. Severe transverse erosion at the pier base as well as lowering of channel bed upstream of the pier was observed because of channel dredging. Streambed instability was analysed based on two non‐dimensional parameters, namely, pier exposure factor and normalized upstream incision depth. The maximum values of both these parameters were observed when the mining pit was dredged closest to the pier. We also observed growth in streambed instability with an increase in flow Reynolds number.

中文翻译：

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疏channel河道中桥墩周围的河床失稳

我们进行了水槽实验，以研究位于采矿坑下游的圆形墩周围的形态行为。由于河道疏ed，观测到了墩台底部的严重横向侵蚀以及墩台上游的河床床降低。根据两个非维数参数分析了河床失稳，即墩台暴露系数和归一化上游切口深度。当挖坑最靠近码头时，会观察到这两个参数的最大值。我们还观察到，流雷诺数随流雷诺数的增加而增加。