A new numerical simulation approach for 2-D flow with submerged spur-dikes

A new two-dimensional numerical model is presented to simulate the flow in the vicinity of submerged spur-dikes, which employs a finite volume method based on structured triangular mesh, and considers water depth around dikes in continuity and momentum discrete equations. In this model, the spur-dikes are supposed as the dikes without thickness, and generalized as grid lines; the depth and velocity nodes are arranged in grid interface, and the water level nodes are arranged in grid center, which is different from the general staggered-grid nodes distribution. The model is first validated against the available observed data obtained from a flume experiment. It is then applied to simulate the flow with submerged spur-dikes in Dongliu waterway downstream the Yangtze River. The model predictions generally agreed with measured data including velocity and water depth, which demonstrates the capability of the model to simulate the flow in the field of submerged spur-dikes.