
Simulation of Runoff Coefficient for Green Roof Based on SCS Model
ZHANG Qi-zhao, SHEN Hong-bin
Simulation of Runoff Coefficient for Green Roof Based on SCS Model
Green roof is an important infrastructure for the low impact development (LID) and sponge city construction. How to establish a simple and practical hydrologic model, taking the runoff coefficient as an important index, for green roof to evaluate the rainfall-runoff reduction effect is an important question. Based on the measured data of rainfall runoff of green roofs at different times, the calculation expression of runoff coefficient is developed on the basis of the calculation formula of rainfall runoff depth of SCS model. Also, the potential maximum retention is calculated when the measured initial loss is selected reasonably using event analysis method. The results showed that the initial loss and the potential maximum retention at that time are basically linearly related, with an average ratio coefficient of about 0.28. The potential maximum retention will be reduced due to the rainwater retention during the rainfall period, and then gradually recovered during the drought period, and the overall trend is that the initial recovery rate is fast, then gradually decreases, and finally approaches 0. Based on this, A calculation expression to describe the variation process of the potential maximum retention including the rainfall and drought periods is proposed. Based on the runoff depth and runoff coefficient formulas of the SCS model, combined with the calculation expression of the potential maximum retention variation process, the continuous variation processes of the runoff depth and runoff coefficient for green roof are simulated and then the model effect is evaluated using the certainty coefficient R 2 and the Nash Sutcliffe efficiency coefficient NSE. The results showed that the calculated values of runoff depth and runoff coefficient are in good agreement with the measured values. The R 2 values are 0.93, and 0.85, the NSE values are 0.94, and 0.85 respectively, which has a good simulation effect.
green roof / SCS model / event analysis method / the potential maximum retention / runoff coefficient {{custom_keyword}} /
Tab.1 Precipitation and runoff of green roof during monitoring period表1 绿色屋顶降雨径流监测统计表 |
序列 | 时间 | 降雨量/mm | 降雨持续时间/h | 降雨间隔时间/h | 径流深/mm | 截留深/mm | 径流系数 |
---|---|---|---|---|---|---|---|
1 | 2015-06-26 01∶50-06∶35 | 33.3 | 4.75 | 0 | 5.00 | 28.31 | 0.15 |
2 | 2015-06-26 20∶30-21∶35 | 33.5 | 1.08 | 13.92 | 16.75 | 16.75 | 0.50 |
3 | 2015-06-29 13∶15-15∶35 | 8.3 | 2.33 | 63.67 | 0.25 | 8.05 | 0.03 |
4 | 2015-06-30 06∶05-10∶00 | 1.5 | 3.92 | 14.50 | 0.11 | 1.40 | 0.07 |
5 | 2015-07-22 19∶45-21∶05 | 6.7 | 1.33 | 537.75 | 0.07 | 6.63 | 0.01 |
6 | 2015-07-27 20∶00-07-28 00:40 | 54.8 | 4.67 | 118.92 | 25.21 | 29.59 | 0.46 |
7 | 2015-07-28 07∶15-08∶45 | 1.2 | 1.50 | 6.58 | 0.30 | 0.90 | 0.25 |
8 | 2015-08-01 21∶50-22∶55 | 9.7 | 1.08 | 109.08 | 1.07 | 8.63 | 0.11 |
9 | 2015-08-02 01∶15-08∶15 | 1.8 | 7.00 | 2.33 | 0.07 | 1.73 | 0.04 |
10 | 2015-08-07 19∶00-20∶40 | 52.0 | 1.67 | 130.75 | 23.92 | 28.08 | 0.46 |
11 | 2015-09-04 10∶25-09-05 13∶35 | 61.4 | 27.17 | 661.75 | 35.61 | 25.79 | 0.58 |
Tab.2 Event analysis results of SCS model parameters for green roof表2 绿色屋顶SCS模型参数事件分析法统计结果 |
序列 | 时间 | 降雨量/ mm | 径流系数 | 初损量/ mm | 当时可能最大滞留量/mm | 降雨后当时可能 最大滞留量/mm |
---|---|---|---|---|---|---|
1 | 2015-06-26 01∶50-06∶35 | 33.3 | 0.15 | 16.0 | 41.6 | 13.3 |
2 | 2015-06-26 20∶30-21∶35 | 33.5 | 0.50 | 6.0 | 17.6 | 0.9 |
3 | 2015-06-29 13∶15-15∶35 | 8.3 | 0.03 | 6.4 | 12.6 | 4.5 |
4 | 2015-06-30 06∶05-10∶00 | 1.5 | 0.07 | 0.5 | 8.5 | 7.1 |
5 | 2015-07-22 19∶45-21∶05 | 6.7 | 0.01 | 5.2 | 32.1 | 25.5 |
6 | 2015-07-27 20∶00-07-28 00∶40 | 54.8 | 0.46 | 9.0 | 37.4 | 7.8 |
7 | 2015-07-28 07∶15-08∶45 | 1.2 | 0.25 | 0 | 8.4 | 7.5 |
8 | 2015-08-01 21∶50-22∶55 | 9.7 | 0.11 | 5.5 | 12.3 | 3.7 |
9 | 2015-08-02 01∶15-08∶15 | 1.8 | 0.04 | 1.0 | 8.1 | 6.4 |
10 | 2015-08-07 19∶00-20∶40 | 52.0 | 0.46 | 11.4 | 28.3 | 0.2 |
11 | 2015-09-04 10∶25-09-05 13∶35 | 61.4 | 0.58 | 5.0 | 32.7 | 6.9 |
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