Coupled Implicit Simulation of Mobile-Bed Riversby F. M. Holly, Jr., Univ of Iowa, Iowa City, IA, USA,
J. A. Cunge, Univ of Iowa, Iowa City, IA, USA,
B. Wignyosukarto, Univ of Iowa, Iowa City, IA, USA,
R. Einhellig, Univ of Iowa, Iowa City, IA, USA,
Abstract: Numerical and physical deficiencies in existing computational codes for simulation of bed evolution in mobile-bed rivers have led the authors to propose a new approach. The new method is based on fully coupled, implicit finite-difference discretization of the governing water and sediment conservation equations. The full unsteady de St. Venant equations are adopted for water flow. Sediment mass conservation is embodied in an advection-diffusion equation for suspended load, coupled with a bed-load Exner equation through a suspended-sediment source term. A general description of the governing equations, their discretization, and solution strategy is provided along with observations of code performance based on preliminary testing.
Subject Headings: Coupling | Standards and codes | Rivers and streams | Flow simulation | Numerical models | Finite difference method | Water conservation | Sediment
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