钱塘江河口段洪水冲刷效果的影响因素研究

摘要

通过一维动床数学模型，对钱塘江河口段不同江道等因素影响下的洪水冲刷效果进行研究。结果表明：洪水的冲刷效果与江道起始容积、洪峰流量、下游潮汐大小、洪潮遭遇等因素有关。江道起始容积越大，冲刷效率越低；洪峰流量越大，则冲刷效率越高；洪潮遭遇改变了冲刷的过程，但在24h内不论如何遭遇，冲刷总量基本接近。上述研究结果可为钱塘江河口段汛前江道调控确保防洪安全提供参考。%A 1D mobile bed mathematical model has been set up to study the influence factors of flood scouting in the Qiantang Estuary. It shows that the scouring effect has close links with initial volume of estuary, flood discharge, fide range and how the flood and tide wave meets. The bigger the initial riverbed volume is, the less the scour is; and the higher the flood discharge is, the mare the scour is. How the flood and tide wave meets changes the scouring process, but it does not change the total scouring volume during 24h.