平原河网河道结构与水体自净能力关系实验研究  

Relationship between River Structure of Plain River Netand Water Purification Capacity

作　　者：蔡晔[1] 黎明[2] 刘德启[1] 袁雯[3] 顾俊[1] 田香君[1] 

机构地区：[1]苏州大学化学化工学院 [2]苏州大学生命科学学院,苏州215123 [3]华东师范大学资源环境学院,上海200064

出　　处：《环境科学与技术》2007年第3期7-9,共3页Environmental Science & Technology

基　　金：国家自然科学基金项目(40471019);"211工程"学科建设项目(R2317312)

摘　　要：文章利用模拟实验开展了平原地区缓流河道中的水质变化对河道水流速度与来水水质的响应规律研究。结果显示,当流速<0.5m/h时,河道中的各种污染物主要以沉积过程为主。当流速在0.5～1.5m/h时,水体最易受外界有机物输入的影响,容易引起局部水质的恶化。当流速>1.5m/h时,水动力条件有利于河道中的有机物的降解,但促进了底泥磷的释放,并会导致下游河道营养盐的升高。所以在河道改造、城市生态河网建设与管理中,应从区域河网整体着手,也应注意缓流河道中来水水质的管理。Experiment was made to simulate slow flow riverway of plain at the aim to find effect of water quality on current velocity and quality of input water. Results showed that when current velocity below 0.5m/h, contamination in river was mainly in the form of deposit. When current velocity between 0.5~1.5m/h, water body was most vulnerable by external organic matters and quality of local water deteriorated easily. When current velocity exceeds 1.5m/h, the hydrodynamic condition was propitious to the degradation of organic matters, but it promoted the release of phosphorus of sediment from the bottom of river and cause rise of nutrient salts in downstream river. Whole regional river net should be considered and input water quality should be managed in river alteration, construction and management of urban ecotypic river net.

关 键 词：平原河网 水动力条件 污染物转化 实验模拟 

分 类 号：X522[环境科学与工程—环境工程]