Abstract

CCHE1D is a 1-D numerical model for the nonuniform sediment transport under unsteady flow conditions in channel networks. In this study, it is tested using the experimental data of trench migration and mining pit evolution, and applied to assess the impacts of sand and gravel mining on channel morphology in a hypothetical field-scale case. The simulations show that CCHE1D is very stable and does not have numerical oscillations. The model predicts well the trench migration and sediment deposition in mining pits, but it underestimates the headcut and tailcut erosion depths in the experimental cases. For the hypothetical field-scale case, the CCHE1D results are close to the HEC-6 model results, but are somewhat different from those of the ADOT (Arizona Department of Transportation) procedure.

Keywords: Sediment transport, Sediment mining, Headcut, Tailcut, 1-D numerical model