多闸坝河网水系TMDLs计算模型构建及应用

Buildup of TMDLs model for river networks with multi-sluices and its application

针对多闸坝河网水流控制特征,以MIKE11 HD（hydrodynamic）和AD（advection/dispersion））模块的水量-水质模型为基本模块,通过水位-流量关系及其水位控制,体现闸坝调度对河网水动力及其水质的影响,构建了多闸坝河网水系最大日负荷（Total Maximum Daily Loads Process,TMDLs）计算系统,并应用于淮河流域江苏省沂沭泗水系.利用2006年—2008年及2010年水文、水质监测资料对计算模型的率定与验证.验证结果为：计算区域板浦、沭阳闸下站水位计算值和实测值平均相对误差为0.45%和0.91%,仲集和沭阳（南泓）站CODMn和氨氮的计算值和实测值平均相对误差分别为4%~7.1%和6.5%~20.4%.以2010年（平水年）为设计水文条件,研究区内主要水质受限水体CODMn与氨氮最大日负荷年总计值分别为25276.85吨和1932.56吨.

In according with the flow control characteristics of river networks with multi-sluices,a model for calculating Total Maximum Daily Loads（TMDLs）was built based on MIKE11 HD and AD modules.The model reflects the hydrodynamic and water quality influences of dam operation through stage-discharge relation.The Yishusi river system in Jiangsu province was selected as a typical study area,and the calculation model system for TMDLs process was tested in this area.The results showed that the average relative error of calculated water level was 0.45% and0.91% at Banpu and Shuyangzhaxia stations,respectively.The average relative error of the calculated CODMnand NH3-N were 4%~7.1% and 6.5%~20.4% at Zhongji and Shuyang（South Channel）stations,respectively.Taking 2010,a normal flow year as the design hydrological year,TMDLs of COD and NH3-N in the limited water bodies were 25276.85 ton and 1932.56 ton.