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.
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Jin et al. (1999) studied this question.
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