基于杭嘉湖平原河网模型的嘉善水厂断面水质达标分析  

Up-to-standard analysis of water quality based on Hangjiahu plain river network model: A case study of Jiashan waterworks section

作　　者：朱铭铭[1] 逄勇[1,2] 谢蓉蓉[1] 王健健[1] 徐凌云[1] 

机构地区：[1]河海大学环境学院,江苏南京210098 [2]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098

出　　处：《水资源保护》2013年第3期34-38,共5页Water Resources Protection

基　　金：国家自然科学基金(51179053);国家水体污染控制与治理科技重大专项(2012ZX07506-006;2012ZX07506-007)

摘　　要：针对杭嘉湖平原地区河网特征,基于MIKE11软件建立杭嘉湖河网水环境数学模型,并对模型进行率定验证。率定得到河道糙率在0.025～0.05之间,CODMn降解系数在0.08～0.12/d之间,NH3-N降解系数在0.07～0.10/d之间;验证得到水位相对误差小于10%,CODMn和NH3-N的降解系数平均误差分别为11%和20%,模型计算值和实测值吻合良好。基于已建立的模型对研究区域的内外源权重及嘉善水厂断面水质进行达标分析,结果表明:①区域内部污染源对嘉善水厂断面影响大于区域外部污染源影响,CODMn和NH3-N的内源权重分别为55.4%和67.2%;②为使嘉善水厂断面水质达标,CODMn需削减68%,NH3-N需削减75%。According to the characteristics of river networks in the Hangjiahu plain region, a water environment mathematical model was established with the MIKE 11 software, and was calibrated and validated. The calibration results of the model show that the roughness values of the fiver channels ranged from 0. 025 to 0.05, the values of the CODM, degradation coefficient ranged from 0. 08 per day to 0. 12 per day, and the values of the NH3-N degradation coefficient ranged from 0. 07 per day to 0. 1 per day. The validation results of the model show that the relative error of the water level was less than 10% , while the average errors of CODM. and NH3-N concentrations were 11% and 20%, respectively. Based on these results, we can see that the simulated results of the established model fit the measured results well. With the established model, we analyzed the weight parameters of the contributions of pollution sources both inside and outside the study area and conducted an up-to-standard analysis of the water quality at the Jiashan waterworks section. The results show the following ： （ 1 ） the contribution of internal pollution sources in the study area to the water quality of the Jiashan waterworks section was greater than that of the external pollution source： the weight parameter of the internal CODMn was 55.4%, and the internal NH3-N was 67.2% ; and （2） to ensure that the water quality in the Jiashan waterworks section can reach the standard, the amount of CODMn needs to be reduced by 68% and the amount of NH3-N needs to be reduced by 75%.

关 键 词：MIKE11模型 率定验证 断面达标 内外源权重 平原河网 杭嘉湖地区 

分 类 号：X824[环境科学与工程—环境工程]