| This paper deals mainly with spatial distribution and seasonal characteristic ofsuspended sediment, changes in beach profile and shifts of tidal troughs, based uponfield measurements, satellite images, bathymetric charts and so on. The results showthat: 1) total suspended matter (TSM) concentrations have higher values in spring(March-April 2003) than that in autumn (September 2003) and it has higherconcentrations of TSM in near-bottom layer and in nearshore area than that in surfacelayer and in offshore at both seasons;the main component of TSM is inorganic matter;coarser grain-size of TSM occurs within the sand ridges area, while finer in theperiphery of the sand ridges at both seasons. 2) a robust linear relationship isestablished between suspended sediments concentrations (SSC) (mg/l) and in situsurface water spectrum reflectance survey (Rrs) (R2=0.944, n=39) and then SSC of 4seasons in 2003 are retrieved from the satellite images with high precision. 3) Theseasonal characteristic of beach profiles located at the Tiaozini sand ridges areaccumulation in autumn-winter and erosion in spring-summer;it is eroded in the outerarea of Dongsha Sand Ridge and accumulated in the center area. 4) The relationshipbetween the shifts of tidal troughs and the evolution of sand ridges are analyzed onbasis of study on the movements of main tidal troughs and small tidal trough on beach.5) The whole radial sand ridges are in the period of division and shrinking.
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