改善太仓城区水环境原型调水实验研究及模型建立

为达到改善太仓城区水环境的目的,于2004年4月21日进行了调水实验.调水历时14 h,期间向城区调水21.8万m3.通过对监测点采样,得到水量、水质实测数据.根据实验数据,建立了符合太仓河网的水量水质数学模型,分析了从长江引水对太仓城区水环境的改善程度.同时对不同引水方案情况下城区水环境改善效果,以及截污和清淤对水环境的影响做了分析.研究表明,引水只能短期改善水环境;要根治水环境,必须从源头抓起,进行截污.

On City Taicang's water transfer environment and acorresponding simulated model for its improvement

This paper aims at analyzing the effect of water transfer on the quality of water and establishing a mathematical simulation model to improve the City Taicang's water environment.The water experiment presented here was done on April 21,2004.The whole monitoring project consisted of the water level,water quantity and water quality(COD_(Mn),NH~+_4-N) involved in the city.For the research purposes,the authors divided the whole water levels into 16 sections,and the water quality monitoring system into 19 sections.It took a period of time of 14 hours and water was transferred to the city up to 218 000 m~3.The data of water volume and water quality were obtained under the sampling of the test point.From the result of the water transferring experiment,it was found that the city's water environment has been improved to some extent,and the average improvement of COD_(Mn) was 2.7 mg/L.Especially in section 4,the improvement was up to 6.5 mg/L.Based on the data of experiment,we have established the city's hydraulic and water quality simulated models and analyzed the degree of its water environment improvement.At the same time,the improved degree of the city's water environment was shown under the different water diversion projects and the results of clearing-away of sludge and getting rid of pollutant sources.From the achievement rated,it can be found that the calculating values of water quantity and water quality by mathematic model in every section are well into conformity with the monitored value with the relative errors being about 10%-20%,which indicated that the simulated model is practical and feasible for its purpose.Through the research,it can be concluded that the transferring water can improve the urban water environment only temporarily,while radical improvement of the water environment of the city is cutting down the pollutant sources.