1D Modeling of Mud/Debris Unsteady Flows

Abstract

The National Weather Service 1D dynamic flood routing model FLDWAV is enhanced to include capability of modeling mud/debris unsteady flows by including an additional friction slope term in the momentum equation of the Saint-Venant equations. Three techniques are incorporated into the model to determine the mud/debris related friction slope term due to the internal viscous dissipation of non-Newtonian fluids and granular sliding friction of coarse-grained debris surges. These techniques are tested and some computational results are compared with observed field data and experimental data.