Analysis of hydrodynamic forces and water exchange characteristics in Dinggang Lake Wetland
In order to maximize the purification potential of ecological wetlands and alleviate and improve water quality,this article took the Dinggang Lake Wetland Park in Shenzhen as an example.Four water replenishment schemes were developed based on factors such as different riverbed roughness and stepped water levels.A two-dimensional hydrodynamic mathematical model including a water age module was established based on the finite volume method,and a detailed simulation was conducted on the lake area with a grid scale of 3 to 5 m.The spatial distribution of hydrodynamic forces and water exchange characteristics of sedimentation ponds,gravel beds,submerged ponds,and outlet ponds were compared and analyzed.The results showed that ecological water replenishment measures in the narrow waters at the top of the lake area can improve the fluidity and exchange effect of water bodies in terms of hydrodynamic forces.The hydrodynamic forces of 54.23％of the lake area were significantly improved,with increases of 22.9％,2.6％,and 1.7％compared to other schemes.In terms of water age,84.79％of the waters can be completely renewed within 10 days,which is much higher than the other schemes of 73.66％,82.96％,and 84.55％.Due to the local concave bank on the eastern terrain boundary of the outlet pond,the retention areas formed by the four ecological water replenishment measures accounted for 0.84％,0.80％,0.79％,and 0.78％,respectively.The research results can not only provide decision support for the flow characteristics and ecological water replenishment effects of Dinggang Lake,but also provide scientific guidance for urban landscape design and environmental protection.
2D hydrodynamic mathematical modelecological water replenishment schemewater agenumerical simulation
万方数据
维普
