ABSTRACT
During the process of river closure, with the moving of the embankment, the bed and its boundary conditions of the closure gap change accordingly, which brings great difficulty to the hydraulic calculation in construction design. In this work, the moving grid method was applied in river closure modeling to overcome the difficulty faced by traditional fixed grid models where the calculation boundary cannot be dynamically adjusted according to the moving of the embankment. The moving grid method, where the calculation grid can move with the embankment, provides a new way for the calculation of the hydraulic parameters near the gap. The river closure in the Three Gorges Project was taken as an example for model calculation and hydraulic parameter changes during the river closure process were simulated. Comparison revealed that simulation results were in good agreement with results from physical models and measured data, indicating that the developed model can well simulate the hydraulic parameter changes with different widths of closure gap and can provide the necessary scientific basis for river closure project design.
