不同下垫面径流系数及雨强及历时关系的实验研究.pdfVIP

2006, 11( 5) : 55 59 Journal of China Agri ultural University 1 2 1 1 1 武 晟 汪志荣 张建丰 解建仓 汪雅梅 ( 1. , 710048; 2. , 300191) 城市下垫面类型的多样化, 使得径流系数在时空上的变化越来越复杂采用自制模 降雨系统, 对SBS 不透水地砖水泥地面透水砖和草地等典型下垫面进行了实验研究结果表明: 弱透水性的下垫面径流系数容易 达到较高的稳定值, 透水砖的下渗能力接近草地双曲线模型能够较准确地描述径流系数与单影响因素之间的关 系, 并得了到具有 一定物理意义的降雨历时( 或雨强) 与各下垫面径流系数的最优 合公式, 且除透水砖外其相关 系数达92% ~ 97% , 可见降雨历时对径流系数的影响较大相同降雨条件下, 3 种弱透水性下垫面按径流系数由 大到小依次为: 不透水砖SBS水泥路面降雨量较小时, 下垫面的表面洼蓄及附着水层的比例不能忽略, 此时径 流系数不能反映渗透能力透水砖和草地的下渗能力很强, 适当增加其面积可提高城市雨水下渗能力本研究可 为城市雨水利用研究的后续工作提供参考 雨水利用; 径流系数; 降雨强度; 下垫面 P 333 1007 4333( 2006) 05 0055 05 A Experimental study on relationship among runoff coefficients of different underlying surfaces,rainfall intensity and duration 1 2 1 1 1 WuSheng , Wang Zhirong , Zhang Jianfeng , Xie Jiancang , Wang Yamei (1. Instituteof Water Resources,Xi an niversity of Technology, Xi an710048,China; 2.School of Environmental Science and Safety Engineering, Tianjin Institute of Technology,Tianjin300191, China) Abstract The hange of runoff oeffi ient in the time and spa e has be ome more and more ompli ated be aus e of the diversifi ation of the underly ing surfa e of a ity. The experiments for 5 typi al underly ing surfa es were arried out, that is, SBS, waterproof bri k, ement road surfa e, permeable bri k and grassplot by the artifi ial rainfall simulation system. The results show that the runoff oeffi ient is easier to rea h a steady value for a poor infiltrate surfa e . The permeability of a permeable bri k is lose to a grass plot. Hyperboli models had a higher pre ision to des ribe the rela- tionship between runoff oeffi ient