基于SUSTAIN模型的LID设施成本效益分析

Cost-effectiveness Analysis of Low Impact Development Facilities Based on SUSTAIN Model

以深圳市某低影响开发(LID)示范区为研究对象,利用SUSTAIN模型分析LID措施在削减峰值流量方面的成本效益。构建研究区域排水系统的现状模型,并利用实测降雨数据进行率定,在现状模型的基础上构建LID方案,以雨水排放口的峰值流量为控制目标,以LID设施的规模为决策变量,设置不同重现期设计暴雨作为边界条件,对多种组合的LID设施进行模拟,得到各情景下的优化方案以及成本-效益曲线。结果显示,相同的LID设置方案在不同强度的降雨条件下的成本-效益曲线有较大差异,LID设施在高强度降雨下的径流控制效果较差。该研究方法可为相关规划与设计中控制目标的制定与建设方案的优化提供参考。

The cost-effectiveness of low impact development （LID） facilities in peak flow reduc- tion in a LID demonstration area in Shenzhen City were studied using SUSTAIN model. The model for the current drainage system in the studied area was built and calibrated with previous monitored data. LID fa- cilities were configured based on the model. Using the peak flow at the outlet as the control target, the capacities of the LID facilities as the decision variables, and the design storms of different return periods as boundary conditions, the LID facilities with various combinations were simulated, and the optimized schemes and the cost-effectiveness curves for LID facilities under different scenarios were obtained. The results showed that the cost-effectiveness curves of the same LID facilities were very different under rain- fails with different intensities, and the performance of LID facilities was relatively poor under high-intense rainfalls. The study can provide reference for making control targets and optimizing construction scheme when planning and designing LID facilities.