耦合NSGA-Ⅱ算法与高精度水动力模型的LID设施优化设计方法研究

Optimization design method of LID facilities coupling NSGA-Ⅱalgorithm and high-precision hydrodynamic model

目前LID设施优化设计方法中常采用水文方法进行模拟计算,而该方法存在模拟精度不高等问题。基于NSGA-Ⅱ算法并利用城市一、二维耦合水动力高精度数值模型提出了LID设施优化设计成本效益方案的自动寻优方法。将该优化设计方法应用于西安市西咸新区海绵城市建设,分别对单项及组合LID设施优化解集中3种不同建设成本方案进行了分析。结果表明:随着建设成本的增加,单项及组合LID设施的建设效果也随之增加;在相同建设低成本的方案中,组合LID设施建设效果会低于某单项LID设施建设效果,但随着建设成本的持续增加,最终组合设施的建设效果会优于单项设施;决策者可以基于此种方法得到LID设施建设成本与建设效果间的规律,选择满足实际工程需求的设施建设最优方案。

Hydrological methods are commonly adopted in the simulation process of the optimization design of LID facilities,which is often flawed by low simulation accuracy.Here,an automatic optimization method for cost-benefit schemes of LID facility optimization design is proposed based on the NSGA-Ⅱalgorithm and high-precision urban one-and two-dimensional coupled hydrodynamic numerical model.Then,this method is applied to the optimization design of the sponge city construction in Xixian New District of Xi’an City,and three different construction cost schemes of the individual and combined LID facilities are analyzed respectively.The results show that the construction effects of the individual facility and combined LID facilities increase with the increase of the construction cost.In the same low-cost construction scheme,the construction effect of the combined LID facilities is lower than that of an individual LID facility,but as the construction cost continues to increase,the final construction effect of the combined LID facilities keeps increasing and then exceeds that of the individual facility.Using this method,decision makers can grasp the interaction between the cost and effect of the construction and choose an optimal scheme for the construction of LID facilities that meets actual engineering needs.