大沽河下游咸水修复试验及方案的优化研究

Research of saline groundwater restoration test and scheme optimization at Dagu river lower reaches

在系统分析大沽河下游李哥庄地区水文地质条件的基础上,利用Visual MODFLOW的SEAWAT模块建立了研究区的水流和溶质运移模型,运用水位和浓度监测资料对模型进行了识别和检验。在示范区内进行了咸水修复试验,但效果不够显著,因此利用模型对修复方案进行了优化,最终确定了两种方案。结果表明,抽注水方案一和二对于示范区咸水体的修复是可行和有效的;在系统停止运行后的自然状态下,修复效果能够长期维持下去;抽注水方案二更为快速、彻底,且总抽注水量小。

Based on analyzing the hydrogeologic conditions of Ligezhuang area at Dagu river lower reaches, a numerical model of flow and solute transport is set up by the SEAWAT moduler of Visual MODFLOW. The model is checked by the observation data of head and concentration. The project of saline groundwater restoration is carried out in the demonstration area, but the effect is not obvious. So the scheme is optimized with the model and two schemes are finally confirmed. The results indicate that the two schemes are efficient to remove the saline water and the restoration effect could keep for ages. In addition, the second scheme is faster and thorough and its pumping water volume is less than the first one.