Modeling ice cover effect on river channel bank stability

Environmental Fluid Mechanics - Tập 22 - Trang 1121-1133 - 2022
Jiajia Pan1, Hung Tao Shen2
1China Institute of Water Resources and Hydropower research, Beijing, China
2Distinguished Research Professor in Hydraulic Engineering, Department of Civil and Environmental Engineering, Clarkson University, Potsdam, USA

Tóm tắt

This paper presents a numerical model study on the ice cover effect on bank stability in non-cohesive alluvial channels. The model consists of a coupled two-dimensional finite element unsteady hydrodynamic model with bank erosion and mass failure processes for open water and ice-covered conditions. The associated morphological change is modeled with non-equilibrium sediment transport, including the side slope effect on bed load transport. The model adopts two sets of repose angles for emerged and submerged bank materials in analyzing non-cohesive bank mass collapses and redistributions. The model is validated with published laboratory experiments on bank retreat caused by dam-break flow and equilibrium cross-section evolution and showed improvements over existing numerical models. Simulated results showed that the ice cover caused larger bank retreats and bed depositions and slower channel cross-sectional change due to the reduced bed shear stress and the increased flow depth. A bank stability model is developed by coupling the unsteady hydrodynamics, non-equilibrium sediment transport, and bank erosion and mass failure processes. The model is validated with published laboratory experiments and other models. The ice-covered flow causes larger riverbank retreats and slower cross-sectional changes than that of the open channel flow.

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