河口整治工程建筑物局部冲刷试验研究

Model studies on local scour in the regulation project in estuary

采用正态系列模型延伸法,通过试验研究了长江口深水航道治理一期工程丁坝坝头、北导堤头部的局部冲刷深度和范围,试验结果预报了丁坝坝头和北导堤头部的冲刷深度,并得出了合理的防护范围,随着长江口深水航道治理工程实施,试验结果得到较好的实践检验。分别采用稳定流和潮汐往复流试验方法,比较了不同试验水流条件的丁坝坝头冲刷深度,通过原型沙和轻质沙的比较试验,比较了系列模型延伸法采用不同模型沙得出试验结果。

Adopting an extrapolation of series undistorted model test, the local-scour concerned with the 1st-stage regulation project of the deep channel in the Yangtze River estuary were studied. The local-scour holes around the heads of groins and north jetty were simulated in a wide flume. Comparing the result of model tests with the prototype measurements indicates that the depths of local-scour on head of groins and around the north jetty are in a good agreement. In the test, the local scour depths in both steady and tidal current were studied, and the prototype sand and lightweight sediment used in the model were compared too.