Discussion on LID index model construction framework and its graphical application
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摘要: 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.Abstract: 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.
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Key words:
- LID /
- runoff pollution /
- sponge city
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表 1 LID指数设定举例
Tab. 1 Example of LID index setting parameters
LID面积占比(Lx)/% LID径流削减率(Ly)/% LID指数(L = Lx × Ly) 地表径流量(R'地表) 5 90 0.045 代入式(5)计算得到 70 0.035 50 0.025 30 0.015 … … … … 表 2 常用的LID设施径流削减率举例
Tab. 2 Examples of runoff reduction rates for common LID facilities
表 3 使用LID设施后的LID指数与地表径流关系
Tab. 3 Relationship between the LID Index and runoff after using an LID facility
LID 面积占比
(Lx)/%LID径流削减率
(Ly)/%LID指数
(L = Lx × Ly)地表径流量
(R'地表)/m35 90 0.045 12539903.34 70 0.035 12703823.65 50 0.025 12867743.95 30 0.015 13031664.26 15 90 0.135 11392461.20 70 0.105 11884222.12 50 0.075 12375983.04 30 0.045 12867743.95 30 90 0.270 9671298.00 70 0.210 10654819.83 50 0.150 11638341.66 30 0.090 12621863.49 60 90 0.540 6228971.59 70 0.420 8196015.26 50 0.300 10163058.92 30 0.180 12130102.58 90 90 0.810 2786645.19 70 0.630 5737210.68 50 0.450 8687776.17 30 0.270 11638341.66 注: 地表径流量的小数点之所以保留 2 位, 是为了显示不同情况下的细微差异, 而非完全相等的值. -
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