摘要: |
科学合理地划分地下饮用水源地保护区,能够以最精准的范围和较低的经济成本来预防水源受到污染,从而达到保证人民群众安全用水的目的。基于MODFLOW模型对石家庄市滹沱河新调整的地下水源地的地下水流场进行了模拟计算,采用MODPATH计算了两种不同工况下(将水源地17口抽水井作为单井,分别设置反向示踪粒子;将17口抽水井作为水井群,并在井群边界处设置反向示踪粒子)示踪粒子反向运移100天和1000天的运移轨迹。结果表明,两种工况下示踪粒子在100天末的平均运移距离分别为0.54 km、0.49 km;示踪粒子在1000天末的平均运移距离分别为6.1 km、5.6 km。此外,还考虑了入渗场使用条件下地下水流场变化。通过分析两种工况的计算结果,得出了水源地的抽水井概化成井群时,示踪粒子反向运移的轨迹几何形状更加规则,且迁移距离相对较短。同时,考虑到入渗场补水情况,将整个入渗场范围纳入一级保护区。 |
关键词: 地下水源地 保护区划分 数值模拟 Modflow 示踪粒子 反向运移 |
DOI: |
分类号:TV21 |
基金项目:国家水体污染控制与治理科技重大专项(2017ZX07101002) |
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Study on division of protection area of groundwater source area near Hutuo River based on MODFLOW mode |
LENG Wenpeng1, TAO Ya2, SUN Ruohan1, XIA Jianxin1
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1.College of Life and Environmental Sciences,Minzu University of China,Beijing;2.Chinese Academy of Environmental Planning,Beijing
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Abstract: |
The division of underground drinking water source protection areas in scientific and reasonable ways can prevent water sources from being polluted in the most precise ways and with a lower economic cost, to achieve the purpose of ensuring safe water usage for the population. The MODFLOW model was utilized to develop and calculate a simulation of the groundwater flow field of the Hutuo River groundwater source area in Shijiazhuang City. By utilizing the MODPATH, the 100 day and 1000 day reverse migration trajectories of the tracer particles when subjected to two different working conditions were calculated. The two working conditions utilized were as follows. First,17 pumping wells inside of the water source area were utilized as single wells, and then reverse tracer particles were set up in each one. Second, by utilizing the 17 pumping wells as a well group, reverse tracer particles were set up at the boundary of the well group. The results were as follows. The average migration distances of the tracer particles at the end of 100 days under each of the two conditions were 0.54 km and 0.49 km; moreover, the average migration distance of each of the tracer particles at the end of 1000 days was 6.1 km and 5.6 km. Also, the simulation considered the change of the groundwater flow field under the condition of utilizing the infiltration field. By analyzing the calculation results of these two working conditions, the present study concluded that when the pumping wells inside of the water source area were generalized into the well groups, the specific trajectory geometry of the tracer particle reverse migration was more regular, and its migration distance was relatively short. At the same time, by considering the specific water supplement situation of the infiltration field, the whole infiltration field was included in the first-grade protection area as well.. |
Key words: underground water source protection zone numerical simulation Modflow tracer particle reverse migration |