Distribution Characteristics of Suspended Sediment Concentration in Yangshan Deep-water Port Sea Area, China

摘要

The Yangshan deep-water port locates in the Qiqu Archipelago with many islands and tidal channels. Taking Yangshan deep-water port sea area as an example, it was researched that distribution characteristics of suspended sediment concentration in archipelago waters, China. Based on the measured data of Oct. 1996, Jan. 1999, May 2006 and May 2007 and the measured surface suspended sediment concentration data from 1998 to 2007, the change characteristic of suspended sediment concentration is analyzed. The suspended sediment concentration in the Yangshan sea area shows four pronounced time-scale variations, i.e. yearly variation, seasonal variation, neap-spring cycle and intra-tidal variation and two spatial scale variations (horizontal distribution and vertical distribution). Moreover, it is discussed to the causes of the variation of suspended sediment concentration. The sediments from the Yangtze Estuary have no direct effect on suspended sediment concentration of the study area, and it is also shown that the suspended sediment concentration is mainly due to local bottom sediment resuspension. There is the high suspended sediment concentration in the part area of Yangshan sea area, especially, along the Xiaoyangshan Island and Dayangshan Island chain direction. The phenomenon is mainly due to the “strait-channel effects”