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The suspended sediment transport equation and its near-bed sediment flux

Science china(Technological Sciences) 2009年第2期52卷 387-391页

作者： li ruijie1,2, luo feng2 & zhu wenjin3 1 key laboratory of coastal disaster and defence (Hohai University), ministry of education, nanjing 210098, china 2 laboratory of Marine Environment, Hohai University, nanjing 210098, china 3 Institute of Physical Oceanography, Hohai University, nanjing 210098, china 1. key laboratory of coastal disaster and defence (Hohai University) Ministry of Education Nanjing 210098 China 2. laboratory of Marine Environment Hohai University Nanjing 210098 China 3. Institute of Physical Oceanography Hohai University Nanjing 210098 China

The suspended sediment transport equation and its near-bed sediment flux are one of the key problems of sediment transport research under nonequilibrium condition. Based on the three-dimensional primitive suspended transport equation, the two-dimensional suspended sediment transport equation is deduced. The derived process indicates that the physical essence of the near-bed sediment flux is right the bottom boundary condition for the suspended sediment transport equation. This paper analyzes the internal relations between the two methods of sediment carrying capacity and shear stress in common use, points out the consistency of these two methods in terms of form and physical meaning, and unifies these two methods theoretically. Furthermore, based on the analysis and comparison of the expressions of the near-bed sediment flux, this paper summarizes some problems to which attention should be paid, thus offering a novel approach to the study and the solution of the problems of suspended sediment transport and exchange flux of near-bed water sediment.

关键词： suspended sediment transport equation near-bed sediment flux sediment carrying capacity shear stress

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