洪潮遭遇下沿海城市低影响开发措施有效性研究

Study of effectiveness of low impact development in coastal cities affected by flood and tide

针对沿海城市地势平坦、地下水位高、洪潮遭遇等特点,对不同潮位影响下的低影响开发(LID)措施有效性进行了研究,发现以下渗为主要功能的低影响开发措施在不同重现期暴雨及不同潮水位共同作用下的失效规律,由此给出该类地区在海绵城市建设中对不同低影响开发措施实施的优先度.以三亚市某排水片区为例,对5种典型的低影响开发措施进行选址,基于SUSTAIN对不同低影响开发设施及其组合的径流量控制及污染物削减效益进行了评估并对低影响开发组合措施的实施率进行了优化,得到了低影响开发措施对该排水区径流控制率贡献排序以及对TSS、TN、TP削减率的排序.最后,以海绵城市建设控制率为约束,以成本-效益为目标,确定了低影响开发优化方案,本文对沿海地区的海绵城市建设中低影响开发设施布置具有借鉴意义.

Based on the characteristics of the coastal cities,such as flat terrain,high water level and floods meeting with tides,we study the effectiveness of low impact development(LID)measures under different tide levels,and found the failure rule of rainstorm under different return period of low impact development measures such as infiltration trenches and porous pavement whose main faction is infiltration.From this rule,we can give priority to the implementation of different low impact development measures in the construction of sponge cities.Taking the drainage area of Sanya City for example,five typical low impact development measures’sites are selected.Based on SUSTAIN,the runoff control and pollutant reduction benefits of different low impact development facilities and their combinations are evaluated and the implementation rate of low impact development combination measures is carried out.After optimization,the order of the contribution of the low impact development measures to the runoff control rate of the drainage area and the order of the TSS,TN,and TP reduction rates are obtained.Finally,with the control rate of sponge city construction as the constraint and the cost-effectiveness as the goal,the low impact development optimization scheme is determined.This paper has reference significance for the layout of low impact development facilities in the sponge city construction in coastal areas.