道路雨水口布设方案对泄流能力影响的模拟研究

Simulation of Effect of Road Rainwater Inlet Layout Scheme on Drainage Capacity

雨水口作为城市排水系统的重要组成部分,其布设情况对周边小区及道路积水的消除至关重要。为此,利用耦合了水文和水动力过程的数值模型,研究雨水口在不同道路纵坡坡度、布设数量和径流流量条件下的泄流能力。结果表明,道路纵坡坡度越大,雨水口的泄流能力越差,在小流量、雨水口数量为5个(间距为20 m)的条件下,当道路纵坡坡度从0.3%增至8%时,雨水口泄水率从55.64%降至21.05%;雨水口数量越多,其泄流能力越强,在小流量、道路纵坡坡度为0.3%的条件下,当雨水口数量从2个增至5个(间距由50 m降至20 m)时,雨水口泄水率由25.60%增至55.64%;径流流量越大,雨水口的泄流能力越差,在道路纵坡坡度为0.3%且布设5个雨水口的条件下,小、中、大3种流量下雨水口泄水率分别为55.64%、46.92%、37.28%。

As an important part of urban drainage system,the layout of rainwater inlet is crucial to eliminating ponding in surrounding communities and roads.Therefore,a numerical model coupled with hydrological and hydrodynamic processes was used to investigate the drainage capacity of rainwater inlet at different road longitudinal slope gradient,inlet number and runoff flow.The larger longitudinal slope gradient of the road resulted in a worse drainage capacity of the rainwater inlet.In scenario of small runoff flow and five rainwater inlets(spacing of 20 m),the drainage flow of the rainwater inlet decreased from 55.64% to 21.05% when the longitudinal slope gradient of the road increased from 0.3% to 8%.The larger number of rainwater inlets resulted in a stronger drainage capacity.In scenario of small runoff flow and longitudinal slope gradient of 0.3%,the drainage flow of rainwater inlets increased from 25.60% to 55.64% when the number of rainwater inlets increased from 2 to 5(spacing decreasing from 50 m to 20 m).The larger runoff flow resulted in a worse drainage capacity of rainwater inlet.In scenario of longitudinal slope gradient of 0.3% and five rainwater inlets,the drainage flow of rainwater inlet under small,medium and large runoff flow was 55.64%,46.92% and 37.28%,respectively.