暴雨和缓冲带特征对城市滨水缓冲带雨洪消减与水质净化效果的影响机制

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 暴雨和缓冲带特征对城市滨水缓冲带雨洪消减与水质净化效果的影响机制 DOI: 10.5846/stxb201902230337 作者: 作者单位: 中国城市规划设计研究院,中国建筑设计研究院有限公司 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金面上项目（51678002）；国家重点研发计划（2016YFC0401108） The influence mechanism of stormwater reduction and water purification of urban riparian buffer strip on different stormwater and buffer strip conditions Author: Affiliation: China Academy of Urban Planning and Design,China Architecture Design&Research Group Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 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. 参考文献 相似文献 引证文献