杭州湾北岸多年水沙特性变化及原因探讨

Under the influence of strong tide, the north bank of Hangzhou bay is affected by human activities such as reclamation. Base on the measured data in 1982 and 2017, this paper analyzes the dynamic variation characteristics of the tide dynamics, suspended sediment concentration (SSC), salinity and morphology of the north bank of Hangzhou Bay in 35 years. Compared with 1982, the tidal current fields is unchanged in the region, appearing the character of reciprocating flow. Flood velocity is faster than fall. The depth-average SSC in the study area decreased by 22%. The spatial distribution of the high SSC area moved from Luchaogang to the inward bay, the bottom SSC was concentrated, the concentration gradient of surface and bottom layer increases. The SSC in the Jinshan Trough increased by 79% over the years. In the study area. In consideration of the changes of coastline and topography, it is closely related to the sediment load reduction of the Yangtze River, topography erosion and deposition, and local human activities. The north bank of Hangzhou Bay will still face the risk of erosion.