THE STUDY ON 3-DIMENSIONAL MATHEMATICAL-MODEL OF RIVER BED EROSION FOR WATER-SEDIMENT 2-PHASE FLOW

Based on the tensor analysis of water-sediment two-phase how, the basi c model equations for clear water flow and sediment-laden flow are ded uced in the general curve coordinates for natural water variable-densi ty turbulent how. Furthermore, corresponding boundary conditions are a lso presented in connection with the composition and movement of non-u niform bed material. The theoretical results are applied to the calcul ation of the float open caisson in the construction period and good re sults are obtained.