A 1D-2D coupled model of the dam-break flood under the joint action of flood and storm surge and its application
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Abstract:
In order to solve the problems of flood overflow, dam break, and back flow of tidal water in river channels in complex conditions, in this paper, we developed a one- and two-dimensional coupled hydrodynamic model to simulate the overflowing and dam-break flood from natural river channels under the joint action of flood and storm surge in a flood-control protection area. Taking into consideration both computational efficiency and precision, we generated grids of different zones, and set a reasonable grid area. According to different vegetation types and surface features, we set different roughness for different zones. We coupled the one-dimensional model of the river channel and the two-dimensional model of the flood-control protection area through the broad-crested weir, used the erosion-based gradual collapse method to simulate the dam-breaking process of the river channel, and realized fine simulation in the complicated situation with flood in the upper reaches of the river and storm surge in the lower reaches. The case study showed that this model can flexibly deal with complicated and volatile hydraulic conditions, and can produce reasonable simulation results. It can provide a powerful basis for the decision-making of flood prevention departments.
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