A Case Study Of 3-D Numerical Simulation Of Suspended Sediment Transport In The East China Sea After Typhoon

The East China Sea shelf is a typical area of turbid plume. Spatial and temporaldistribution of suspended sediment in this area is so complicated as complexhydrodynamic conditions and frequent occurrence of typhoon in summer. Thus manyresearch works focus on this area.Based on ECOMSED model, a three-dimensional numerical model has beendeveloped for turbid water area near the Changjiang Estuary in the East China Seaand the distribution of suspended sediment concentration (SSC) is simulated after theSaomai typhoon struck in this area on Aug.2006. By using the QuickSCAT/NCEPblended wind overlapped with Jelesnianski's typhoon and hydrodynamic conditionswhich are more close to the actual situation, the numerical results mostly coincidewith the observational data of profile of SSC. The horizontal and vertical distributionfeatures of SSC are further discussed. The conclusions are: overall, SSC reducesgradually from the seashore to the offshore area and generally parallels to the seacoastline and isobaths; in summer, suspended sediment area is smaller and the front of SSCis located between 122°E and 123°E；since hit by typhoon, suspended sedimentrange expands; in the Minzhe coastal area, SSC parallels to the seacoast line; Profilesof SSC in the East China Sea are various, such as quasi linear structure, slantedstructure etc.; in four chosen areas, the correlation between wind, current, SSC areanalyzed leading to the conclusion that SSC in different areas are mainly controlledby different dynamic factors and it is more sensitive in response to typhoon for SSCthan that for current.