Journal of the korean society of oceanography

The Korean Society of Oceanography (한국해양학회)
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Effects of Upwelling/Downwelling on Suspended Particulate Matter Distributions over Shelf Mud Areas: Numerical Experiments

  • Gao, Shu (MOE Key Laboratory for Coast and Island Development, Nanjing University) ;
  • Jia, Jian-Jun (MOE Key Laboratory for Coast and Island Development, Nanjing University)
  • Published : 2002.09.01
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Abstract

The mud deposit located to the south of Cheju Island, the East China Sea, is characterized by an upwelling system or, on occasions, a combined upwelling-downwelling system. The water mass here is associated with relatively high suspended matter concentrations. In the present study, a vertical I-D model is used to undertake numerical experiments for evaluating the upwelling and downwelling effects on the suspended particulate matter distribution patterns within the water column. The results show that: (1) because the upwelling or downwelling velocity tends to be of the same order of magnitude as the settling velocity of suspended particles, a number of different patterns of suspended matter concentration distribution are possible, depending on the relative importance of the velocities; (2) the presence of upwelling can enhance the suspended particulate matter concentration; and (3) in an upwelling-downwelling system, maximum concentrations may or may not lie in the middle of the water column, depending on, once again, the interrelationships between the opwelling/downwelling velocities and the settling velocity. Hence, the physical processes associated with upwelling/downwelling appear to be relevant to the suspended material distribution over shelf mud areas.

Keywords

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