LID指数模型构建框架及图解应用探讨

Discussion on LID index model construction framework and its graphical application

在分析不同低影响开发技术(Low Impact Development,LID)措施的径流削减效果的基础上,提出了基于LID径流削减效率的LID指数的模型,进而设计了LID设施选择图,以根据建成区径流污染削减目标而快速选择适宜的LID设施类型及不同LID设施类型的比例.结果表明,随着LID指数增加,雨水径流量及雨水径流污染物呈类似指数形式降低,且LID指数越大,LID径流削减率越大,但是径流削减的边际效应逐渐降低;该模型灵活性较高,具有探索应用意义.

In this paper,we propose the concept of“LID(low impact development)Index”and“LID Runoff Reduction Efficiency”based on an analysis of runoff cutting efficiency for different LID technical measures.A map was designed to help quickly select the appropriate LID facility and its proportions according to the pollution reduction target in a built-up area.It shows that when the‘LID index’increases,surface runoff and pollutants exhibit a similar exponential function form;the larger the LID index,the lower the“LID runoff reduction efficiency”.The model data is easy to obtain and flexible,rendering potential applications worthy of exploration.