钱塘江河口杭州湾风暴潮溢流计算方法研究

建立钱塘江河口杭州湾风暴潮模型,探讨风暴潮出现溢流的计算方法。将可能出现溢流的沿海堤防以及海水侵入的陆地均依照高程概化为计算区域,采用糙率控制潮水的溢流流量,以模型的堤顶单宽流量和根据计算潮位采用宽顶堰公式换算流量的一致性来率定糙率值。在此基础上模拟了风暴潮漫溢堤防的过程,结果表明风暴潮出现溢流后,钱塘江河口杭州湾之间两岸大片的陆地存在淹没风险,沿程潮位由于溢流出现不同程度的降低响应。

Numerical method for the storm tide overflow model in Hangzhou bay and Qiantangjiang estuary

Qiantangjiang estuary and Hangzhou bay are famous for their macro tide ranges in China.During typhoon period,if high tide levels formed by the spring tides piled up with the peal}value of storm surge higher than the dike elevation,the sea water overflow will happen,and the people and estate in the protected area behind the dikes will be endangered.A storm tide overflow model for Qiantangjiang estuary and Hangahou bay is set up to enhance the technique for storm tide forecasting in the case of overflow.A computed method for the overflow is presented to simulate the processing of the storm surge flowing over the dike.The inundation risk of the area behind the dikes is studied when the storm surge overflow is happened.And the response of storm tidal water levels induced by the overflow is discussed.