摘要: This report describes the theoretical principles of three-dimensional sedimenttransport and bed evolution processes and numerical solution of the appropriate governing equations. It also includes technical documentation and user's... 展开 This report describes the theoretical principles of three-dimensional sedimenttransport and bed evolution processes and numerical solution of the appropriate governing equations. It also includes technical documentation and user's instructions for the sediment-operations program module developed as an integral part of the CH3D-WES code. The generalized CH3D-WES code provides numerical simulation of three-dimensional unsteady water flow, sediment transport, and bed evolution in natural watercourses. Sediment mixtures are represented through a suitable and unlimited number of discrete size classes, any of which may be subject to either suspended load or bed load transport (or both) depending on prevailing local hydrodynamic conditions. The governing dimensionless sediment equations are SIGMA-stretched in the vertical direction and transformed into general (nonorthogonal) curvilinear coordinates in the other two directions. The generalized CH3D-WES code includes the feedback between the flow field and changes in bed elevation, bed-surface size distribution, and the density of the mixture containing water and suspended sediment. This report contains detailed descriptions of the sediment-operations program module, memory and time requirements, and an input-data guide for the module. The new mobile-bed numerical procedures are tested by applying the CH3D-WES code with its new sediment-operations program module to a natural prototype case: the Mississippi River at the Old River Control Structure complex. Alluvial channels, Sedimentation, Bed load transport, Suspended sediment transport, Numerical modeling. 收起