弯曲性分叉河道中污染物扩散性的初步研究.pdfVIP

第 22 卷第 4 期 水 资 源 保 护 Vol . 22 No . 4 2006 年 7 月 WATER RESOURCES PROTECTION Jul . 2006 弯曲性分叉河道中污染物扩散性的初步研究 1 1 2 1 江 　帆 ,陈维平 ,陈　敏 ,李元元 ( 1. 华南理工大学机械工程学院 ,广东 广州 　510640 ; 2 . 广东省环境保护局 ,广东 广州 　510630) 摘要 :弯曲性分叉河道中水流特征复杂 ,对污染物扩散有很大影响 。为了定量分析其水流特征对污染物扩散 的影响 ,采用有限元方法求解弯曲性分叉河道中的污染物扩散数学模型 ,研究其中污染物扩散的状况 。主要 针对河道回流 、绕流对污染物扩散的影响进行了详细数值模拟计算 ,并分别给出了可视化结果及平均的扩散 距离 。计算结果表明:边界层稍微减弱污染物的扩散 ,弯道分离使污染物扩散呈现多向扩散 ,而回流和绕流 尾迹区使污染物很难扩散 ,从而有利于泄漏污染物的收集和集中治理 。 关键词 :河流污染 ;弯曲性分叉河道 ;污染物扩散 ;数学模型 ;有限元 ( ) 中图分类号 :X12 　　　文献标识码 :A 　　　文章编号 :1004 6933 2006 04 003003 Primary study on diff usion of conta minants in meandering f urcated rivers 1 1 2 1 JIANG Fan , CHEN Weiping , CHEN Min , L I Yuanyuan ( 1. College of Mechanical Engineering , South China University of Technology , Guangz hou 510640 , China ; 2. Environmental Protection B ureau of Guangdong Province , Guangz hou 510630 , China) Abstract :The flow characteristics in meandering furcated rivers are complicated and have great influence on the diffusion of contaminants. In order to analyze the influence quantitatively , the mathematical model for diffusion of contaminants was solved by finite element method . The influences of circumfluence and back flow on the diffusion of contaminants were simulated and calculated in detail , and the visual result and averaged diffusion distance were obtained . The results include that the boundary layer can alleviate the diffusion a little , the separation of the bends make the contaminants diffuse in multidirection , and contaminants are difficult to diffuse in circumfluence and wake of back , which are good for the colle