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

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

References

  1. Principles of Ocean Physics Apel, J.R.
  2. Cont. Shelf Res. v.4 Rates of sediment accumulation and particle reworking based on radiochemical measurements from continental shelf deposits in the East China Sea DeMaster, D.J.;B.A. McKee;C.A. Nittrouer;J.C. Qian;G.D. Cheng https://doi.org/10.1016/0278-4343(85)90026-3
  3. Acta Oceanologica Sinica v.11 no.1 Relationship between tidal current field and sediment transprot in the Yellow and Bohai Sea(in Chinese with English abstract) Dong, L.X.;J.L. Su;K.S. Wang
  4. J. Mar. Sys v.7 Fine sediment deposits in shelf seas Dronkers. J.;A.G. Miltenburg https://doi.org/10.1016/0924-7963(95)00036-4
  5. Coastal and estuarine sediment dynamics Dyer, K. R.
  6. Cohesive Sediments The in-situ determination of the settling velocities of Suspended fine-grained sediment: a review Eisma, D.;K.R. Dyer;W. van Leussen;Burt, N.(ed.);R. Parker(ed.);J. Watts(ed.)
  7. Cont. Shelf Res. v.20 Bottom-boundary-layer processes associated with fine sediment accumulation in coastal seas and bays Friedrich, C.T.;L.D. Wright;D.A. Hepworth;S.C. Kim https://doi.org/10.1016/S0278-4343(00)00003-0
  8. Marine Science Bulletin(English Version) v.2 no.1 Characteristics of suspended sediment concentrations over the areas adjacent to the Changjiang River estuary, the summer of 1998 Gao, S.;P. Cheng; Y.P. Wang;Q.Y. Cao
  9. J. Sea Res. Suspended sediment and nutrient concentrations over East China Sea continental shelf, summer 1998 Gao S.;Y.P. Wang;W.H. Zhao
  10. Oceanologica et Limnologia Sinica v.28 no.SUP Issue Suspended matter of the northern East China Sea in the springs: its distribution structure and effect on sedimentation(in Chinese with English abstract) Guo, Z.G.;Z.S. Yang;D.X. Hu;H. Bai
  11. Acta Sedimentologica Sinica v.18 Study in comparison sedimentary geochemistry of mud area on East China Sea continental shelf(in Chinese with English abstract) Guo, Z.G.;Z.S. Yang;Y.H. Qu;D.J. Fan
  12. Chinese Journal of Oceanology and Limnology v.2 Upwelling and sedimentation dynamics. I. The role of upwelling in sedimentation in the Huanghai Sea and East China Sea-a description of general features Hu, D.-X. https://doi.org/10.1007/BF02888388
  13. The Marine Geology of the East China Sea(in Chinese) Jin, X.L.(ed.)
  14. Oceanologia et Limnologia Sinica v.32 Suspended sediment fluxes in spring on the East China Sea Shelf with different surface sediment types(in Chinese with English abstract) Lei, K.;Z.S. Yang;Z.G. Guo;H. Bai
  15. Cont. Shelf Res. v.16 Shelf mud fields formulation within historical times: examples from offshore the Gironde estuary Lesueur, P.;J. P. Tastet;L. Marambat
  16. J. Geophys. Res. v.88 Particulate size spectra, behavior, and origin of nepheloid layers over the Nova Scotia contienental rise McCave, I. N. https://doi.org/10.1029/JC088iC12p07647
  17. Cont. Shelf Res. v.4 Mordern Huanghe-derived muds on the outer shelf of the East China Sea: Identification and potential trasport mechanisms Milliman, J.D.;R.C. Beardsley;Z.S. Yang;R. Limeburner https://doi.org/10.1016/0278-4343(85)90028-7
  18. Sedimentary Facies in the Active Plate Margin Sediments and sedimentary processes in the Yellow and East China Sea. Milliman, J.D.;Y.-S. Qin;Y.A. Park;Taira, A.(ed.);F. Masuda(ed.)
  19. China Ocean Engineering v.18 no.3 Numerical modeling of vertical distribution of suspended sediment concentrations, North Chanel. Changjiang Estuary (in Chinese with English abstract) Shi, Z.;H.Q. Zhou
  20. Oceanologia et Limnologia Sinica v.31 Spatial and temporal variations in suspended particulate matter trasport on the Yellow and East China Sea shelf (in Chinese with English abstract) Sun, X.G.;M. Fang;W. Huang
  21. Unpublished Ph.D.Thesis Northwestern Pacific Ocean circulation patterns and their influence on the circulation in China seas (in Chinese with English abstract) Xu, D.F.
  22. J. Oceanogr. v.51 A numerical experiment on the sediment processes in the Yellow Sea and the East China Sea Yanagi, T.; K.-I. Inoue https://doi.org/10.1007/BF02270523
  23. J. Oceanogr. v.52 Baroclinic eddides south of Cheju Island in the East China Sea Yanagi, T.; T. Shimizu;T. Matsuno https://doi.org/10.1007/BF02239464
  24. J. Oceanogr. v.52 Seasonal variation in the transport of suspended matter in the East China Sea Yanagi, T.;S. Takahashi;A. Hoshira;T. Tanimoto https://doi.org/10.1007/BF02238320
  25. Acta Oceanlogica Sinica v.23 no.2 Basic pattern of transportation of suspended mater from the Yellow Sea and East China Sea to the east deep seas (in Chinese, with English abstract) Yang, Z.-S.;Z.-G. Guo;Z.-X. Wang;J.-P. Xu;W.-B. Gao
  26. Geochemistry (in Chinese) Zhao, Y.-Y.;M.-C. Yan