天津滨海新区典型河网区非汛期水流循环研究

Hydraulic Circulation of Rivers for the Non-flood Period in the Pilot Area of Tianjin Binhai New Area

针对滨海新区水环境质量差、水资源量不足的问题,结合滨海新区典型河网区河网分布特点提出了非汛期7种水流循环方案。基于丹麦MIKE11平台水动力模块(HD)、对流扩散模块(AD),构建了流域水动力水质一维耦合模型,分别对7种水流循环方案进行模拟,分析了不同闸、泵调度下研究区水质变化趋势及其改善的效果。根据模拟结果,以提高河道水生态质量为评价标准,得出方案4为研究区最佳水流循环方案,方案4在整个模拟期河道最高水位为2.1 m,低于河堤高度,排水泵站(孟港排河泵站)出水COD、NH3-N分别为18.04 mg/L、0.15 mg/L,滨海新区典型河网区河流断面COD、NH3-N平均为16.63 mg/L、0.49 mg/L,劣Ⅴ类断面比例分别为14.22%、5.9%,滞水长度为10 225.25 m。在模型建模过程中,对水动力、水质参数的本地化求算进行了研究和探索。

In order to improve water quality and increase water quantity in Tianjin Binhai New Area （TI3NA）, seven kinds of non-flood water circulation schemes in a typical river area of TBNA were proposed according to the river characteristics. A one-dimensional model on hydrodynamic and water quality in the pilot area was established based on the HD and AD module in MIKE11 and seven water circulation schemes in non-flood period were simulated one by one. Comparing the simulation results obtained in different sluice managements, the simulation result showed that plan IV was the best water circulation scheme to improve river water quality. The simulation result was that the deepest river water was 2.1 m lower than the embankment height, and the length of stagnant water was 10 225.25 meter. The COD and NH3-N concentrations of the outlet water were 18.04 mg/L and 0.15 mg/L in Menggangpai he Pumping Station, and 16.63 mg/L and 0.49 mg/L in the sectional section, respectively. The proportion of V-class inferior section were 14.22% and 5.9%. In addition, some research and exploration were done on model parameters in this paper.