Urban stormwater and flood control effect of green and grey infrastructures under extreme rainfall conditions
ZHENG Peng1,2, WANG Bei-lei1, CHEN Zi-jie3, PAN Wen-bin1, HUANG Jian-hui4
1. College of Environment and Resources, Fuzhou University, Fuzhou 350108, China;
2. Key Laboratory of Ecological Environment and Information Atlas Fujian Provincial University, Putian University, Putian 351100, China;
3. Fujian Environmental Protection Design Institute Co., Ltd., Fuzhou 350012, China;
4. Fujian Provincial Key Laboratory of Ecology-Toxicological Effects and Control Techniques of Emerging Contaminants, Putian 351100, China
3 universal green infrastructures (green roof, vegetative swale and permeable pavement) and 2 grey infrastructure mitigations (large diameter tube & reservoir) were selected to design 9 types of storm water drainage system modification scenarios in Fuzhou University campus. Under different extreme weather conditions (3 recorded rainfall events with different duration), SWMM model was used to analyze urban stormwater and flood control effect under different simulation scenarios (SS1~SS9). The control effect included runoff depth, node J8 flood flow and flood time, peak time and full flow time in C8 pipeline. The simulations results showed that simulation scenarios including green infrastructure had better control effect. Compared to other simulation scenarios, combinations of green roofs, vegetative swales and continuous permeable pavement systems (SS7) exhibited the best control effect on runoff depth under 3 rainfall events, the reduction ratio under the middle duration rainfall event was the highest, reaching 78%. While combinations of green roofs, vegetative swales, continuous permeable pavement systems and large diameter tubes (SS8, with the characteristics of infiltration, retention and quick drainage) displayed the best control effect on node J8 flood flow and flood time under 3rainfall events, reaching 100%. On the pipe flood control aspect, three combinations including green roofs, vegetative swales, continuous permeable pavement systems (SS7, SS8 and SS9) had a better effect on peak flow and full flow time in C8 pipeline than other simulation scenarios. Combinations of green roofs, vegetative swales, continuous permeable pavement systems and reservoirs (SS9) had the minimum full flow time and latest peak time in the short duration rainfall event. Combinations of green roofs, vegetative swales and continuous permeable pavement systems (SS7) had the minimum full flow time and latest peak time in the long duration rainfall event. Three combinations (SS7, SS8 and SS9) had no distinct differences on pipeline flood control in the middle duration rainfall event.
郑鹏, 王蓓蕾, 陈子杰, 潘文斌, 黄建辉. 极端降雨下绿基和灰基联用的雨洪控制效果[J]. 中国环境科学, 2019, 39(5): 2123-2130.
ZHENG Peng, WANG Bei-lei, CHEN Zi-jie, PAN Wen-bin, HUANG Jian-hui. Urban stormwater and flood control effect of green and grey infrastructures under extreme rainfall conditions. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 2123-2130.
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