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  The presence of high turbid water characterizes the Yellow and East China Seas. It is then expected that absorption/desorption processes between radionuclides and the suspended sediment are pronounced in the Yellow and East China Seas. We are therefore developing a sediment transport model to simulate the seasonal variation in the suspended sediment concentration. POM-SED is adopted in which wave-induced vertical mixing is incorporated. The model resolution is 1/18 degree horizontally, while 20 sigma layers are used vertically. The model is driven by tides and monthly mean wind and river discharges. Monthly values of sediment inputs from major rivers are prescribed. The bottom sediment distribution is based on the map prepared by Choi (2003).

 

  Animation below shows the near-surface suspended sediment concentration(SSC) in the YS and ECS computed with climatological condition. Simulated results show the constant appearance of high SSC along the western coast of Korea, and along the Chinese coast south of about 34°N. Seasonal variability is obviously noted. Values of SSC in autumn and winter are generally higher than those in spring and summer, except for the river mouth regions in summer where high SSC values appear due to large amount of sediment discharge. The tongue-shaped pattern with high SSC off the northern Jiangsu coast tends to form in September and maintain until April. The highest SSC in the maxima turbidity off the northern Jiangsu coast appears in September and December. The model refinement is still underway through the comparison with remote sensing images and in situ measurements.

 

Simulated SSC (Suspended sediment concentration) at surface layer