摘要:通过设置多组实验，模拟不同暴雨径流及缓冲带条件，对城市滨水缓冲带在不同暴雨雨型、历时、重现期、缓冲带坡度、植被覆盖度、初期冲刷等条件下的径流削减和水质净化作用进行研究。得出在不同实验条件下，滨水缓冲带的雨量动态径流系数结果在0.29-0.55之间。分析实验结果发现缓冲带对峰型靠前、历时较短、重现期短的暴雨径流削减效果更好，同时更平缓与植被覆盖度更高的缓冲带对径流的削减效果更佳。模拟实验显示，径流中不同污染物去除率范围分别为：SS为66.41%-90.29%、TN为44.48%-64.90%、NH₃-N为32.72%-63.68%、TP为89.83%-95.04%、COD为34.32%-66.23%。缓冲带的径流水质净化效果在应对不同暴雨雨型时未显示明显规律，而缓冲带对中高浓度径流污染物削减率更高能够应对较强的初期冲刷效应。同时更平缓与植被覆盖度更高缓冲带，即表流流速更缓慢时，显示出更好的径流净化效果。



Abstract:This simulation study investigated the function of riparian buffer strips in reducing rainstorm-runoff and purifying pollutants under various conditions of rainstorm types, durations, recurrence periods, slopes of the riparian buffer strip, vegetation coverage, and first flush. Simulation of rainstorm-runoff and buffer strip conditions indicated that the pluviometric runoff coefficient of the riparian buffer strip ranged from 0.29 to 0.55. The riparian buffer strip function in reducing rainstorm-runoff worked better when storm duration was short, and the recurrence period was long. The reduction of rainstorm-runoff was also better when the buffer strips had gentle slopes and good vegetation cover. Pollutant removal rates were:suspended solids 66.41%-90.29%, total nitrogen 44.48%-64.90%, ammonia nitrogen 32.72%-63.68%, total phosphorus 89.83%-95.04%, and chemical oxygen demand 34.32%-66.23%. There is no clear trend of riparian buffer strip's purifying function in different storm types. The riparian buffer strip can purify first flush because of the higher reduction rate to high concentration runoff pollutants. In addition, the riparian buffer strip purifies better when the surface flow velocity is slower.





PDF全文下载地址:

https://www.ecologica.cn/stxb/article/pdf/stxb201902230337