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      Modelling of hydrodynamics and cohesive sediment transport in Tanshui River estuarine system, Taiwan

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      Marine Pollution Bulletin

      Elsevier BV

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          Abstract

          A laterally averaged two-dimensional numerical model is used to simulate hydrodynamics and cohesive sediment transport in the Tanshui River estuarine system. The model handles tributaries as well as the main stem of the estuarine system. Observed time series of salinity data and tidally averaged salinity distributions have been compared with model results to calibrate the turbulent diffusion coefficients. The overall model verification is achieved with comparisons of residual currents and salinity distribution. The model reproduces the prototype water surface elevation, currents and salinity distributions. Comparisons of the suspended cohesive sediment concentrations calculated by the numerical model and the field data at various stations show good agreement. The validated model is applied to investigate the tidally averaged salinity distributions, residual circulation and suspended sediment concentration under low flow conditions in the Tanshui River estuarine system. The model results show that the limit of salt intrusion in the mainstem estuary is located at Hsin-Hai bridge in Tahan Stream, 26 km from the River mouth under Q75 flow. The null point is located at the head of salt intrusion, using 1 ppt isohaline as an indicator. The tidally averaged sediment concentration distribution exhibits a local maximum around the null point.

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          Author and article information

          Journal
          Marine Pollution Bulletin
          Marine Pollution Bulletin
          Elsevier BV
          0025326X
          October 2002
          October 2002
          : 44
          : 10
          : 1076-1088
          10.1016/S0025-326X(02)00160-1
          12474969
          © 2002

          https://www.elsevier.com/tdm/userlicense/1.0/

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