New numerical/physical framework for mobile-bed modelling

Abstract

A new computational framework for one-dimensional simulation has been developed. The approach is based on use of the full de St. Venant flow equations, treatment of sediment mixtures, recognition of the distinctly different physics of suspended-load and bedload movement, use of a spatial-delay loading law for bedload, and fully coupled, implicit numerical solution of the resulting set of partial-differential equations. In eliminating most of the conceptual and numerical weaknesses of existing methods, the new approach establishes a new standard of fidelity to the governing conservation laws, whatever be the particular empirical sediment relations employed for a particular application. This article, a companion to Holly and Rahuel [2], presents some demonstrative results and a formal assessment of the method.