Based on the tensor analysis of water-sediment two-phase flow, thebasic model equations for clear water flow and sediment-laden flow are deduced inthe general curve coordinates for natural water variable-density turbulent flow. Fur-thermore, corresponding boundary conditions are also presented in connection withthe composition and movement of non-uniform bed material. The theoretical resultsare applied to the calculation of the float open caisson in the construction period andgood results are obtained.
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