河流连通工程防洪排涝影响二维数值模拟

Influence of River Connecting Project on Flood Control and Drainage Analysis Based on Two Dimensional Model

平原河网地势平坦,阻水河段多,流动性弱,防洪排涝不畅。为充分利用水域水动力势能,找出最严重的阻水河段和提出消除阻水问题的对策,利用平面二维河网数学模型对绍兴柯桥平原现状河网水流运动进行了计算,综合分析得到最严重的阻水河段,提出了利用河流连通工程减弱水流阻水、加快水流运动的措施,利用二维数学模型计算了该工程措施条件下的水流运动状态,通过对比有无工程措施的计算结果,从时间和空间上分析了工程措施对加快水流运动的影响程度,工程实施前、后的最大流速分别为0.089、0.145 m/s,表明河流连通工程措施加快了水体流动,有利于防洪排涝。

Plain river network has the characteristics of flat riverbed, more block water reaches, weak water flow and poor flood control and drainage. To make full use of w,ater hydrodynamic potential energy and find out the most serious block w,ater river reach and put forward some countermeasures to eliminate resistance water problems and speed up the flood control and drainage, two-dimensional model was used to sim-ulate the water flow- in the current situation and the most serious block water of the river was found out by comprehensive analysis. Measures of using river connecting engineering was put forward to lower flow resistance to speed up the flow of water and the water flow was also simulated. From the analysis on the time and space engineering measures to speed up the flow of influence and by comparing the numerical simulation results of current and project situation, the influence of speeding up the water flow was analyzed from temporal and spatial aspects. The result indicates that the maximum velocities before and after the project are 0.089 m/s and 0.145 m/s respectively. The river connecting engineering measures can speed up the water flow and the flood control and drainage.