ABSTRACT

LID methods have been longly considered to manage urban runoff and improve water. In this research, attempts have been made to obtain the optimal size, type and location of LIDs considering the long-term condition of rainfalls in an urban catchment. The results have been compared in three scenarios: normal, wet and dry conditions in terms of annual rainfalls. For this purpose, LIDs including swale, bioretention system, permeable pavement and detention pond were optimally selected for an urban catchment by coupling up SWMM model with NSGA-II algorithm. The optimal combination of LID techniques showed much more impact on flood reduction and pollutants removal compared to the individual LIDs. This is particularly highlighted in the wet scenario where the reduction in the annual flooding and pollutant mass is estimated by 55.96% and 60.2%, respectively. Among the applied LIDs, the permeable pavement had the most reduction in flooding and swale on pollutants reduction.

摘要

长期以来，LID 方法一直被认为是管理城市径流和改善水源的方法。在这项研究中，考虑到城市集水区降雨的长期条件，已尝试获得 LID 的最佳尺寸、类型和位置。结果在三种情况下进行了比较：就年降雨量而言，正常、潮湿和干燥条件。为此，通过将 SWMM 模型与 NSGA-II 算法耦合，为城市流域优化选择了包括洼地、生物滞留系统、透水路面和滞留池在内的 LID。与单个 LID 相比，LID 技术的最佳组合对减少洪水和去除污染物的影响更大。这在潮湿情景中尤为突出，估计每年洪水和污染物质量减少 55.96% 和 60.2%，分别。在应用的 LID 中，透水路面在减少污染物方面的洪水和洼地减少最多。