杭州湾南岸岸线变化对水动力的影响累积效应

基于FVCOM数值模型,针对杭州湾南岸区域,采用移动固边界的方法,对1984年、2010年以及2020年(规划岸线)3个不同时期杭州湾南岸区域的岸线地形进行了模拟,计算了各个时期水动力场。通过对比发现,在人工及自然因素长期对近岸岸线地形的共同改变作用下,金塘水道区域3个时期水动力场有较显著变化。分析宁波舟山海域间水道的三个过流断面的流量发现,3个年代流量有累积变化的趋势。经过进一步分析可推测,在落潮流挟沙能力足够的条件下,水动力的变化可能会进一步加剧南岸及金塘水道区域宁波港(镇海区、北仑区)的淤积,从而影响该区域港口航道的正常使用。

Cumulative effects of topography change on waterway's hydrodynamic along the southern coast of Hangzhou Bay

Hydrodynamic fields are computed with the topography of the year 1984, 2010 and 2020 based on FVCOM model. The hydrodynamic changes near the waterways of Zhoushan and Jintang are studied in details. By comparison, the hydrodynamic fields near Jintang Channel have some significant changes owing to natural and human factors. Analysis on the three Section Runoff in the channel of Ningbo-Zhoushan sea area, it can be easily found that the flow in the three periods has a cumulative effect. After further analysis, it can be assumed that the change of the hydrodynamic field may cause sediment deposition along southern coast of Hangzhou Bay and the port of Ningbo on the condition that the sediment-carrying capacity of flow at low tide is enough, and it would affect the use of the harbor nearby.