水文地质参数对地下水溶质预测结果的影响  

On the effect of the hydro-geological parameters on the forecast of the underground water solute

作　　者：李远伟[1] 苏欣[2] 张静[1,3,4] 甘欣[5] 袁野[1,6] 邓仕槐 

机构地区：[1]四川农业大学资源与环境学院,成都611130 [2]四川师范大学经济与管理学院,成都610101 [3]四川大学建筑与环境学院,成都610065 [4]密歇根州立大学工学院,美国密歇根州东兰辛48823 [5]四川省环境科学研究院,成都610041 [6]四川省成都市环境监测中心站,成都610072

出　　处：《安全与环境学报》2014年第3期303-307,共5页Journal of Safety and Environment

基　　金：国家留学基金项目(201306240067)

摘　　要：以西南某磷矿的尾矿库为对象,研究解析法预测地下水溶质运移过程中水文地质参数对预测结果的影响。通过水文地质勘查获得库区水文地质参数的变化范围,然后选择连续注入示踪剂-平面连续点源模型进行预测。结果表明:极端情况下,承压含水层的总磷最大扩散质量浓度在1 001 d后达到稳定。承压含水层厚度与总磷最大模拟质量浓度呈现倒数关系,当承压含水层厚度小于10 m时,总磷预测质量浓度随承压含水层厚度变化较快;在其他参数为最不利的情况下,承压含水层流速大于0.076 23 m/d时,总磷最大模拟质量浓度随承压含水层流速增大而减小;总磷最大模拟质量浓度随承压含水层扩散系数增大而减小,总磷最大模拟质量浓度随承压含水层扩散系数的变化可分为快速、缓慢下降及平衡3个阶段。In this paper, we have chosen a tailings reservoir of phosphate rocks in China southwest as the case study sample in hoping to explore the effects of the hydro-geologic parameters on the pollution concentration of the groundwater forecast through analysis. As a result, we have obtained the scales of the hydro-geologic parameters by way of doing hydro-geologic investigations and with a continuous injection model of tracer-plane continuous point source to forecast the overall phosphorus concentration. The results of our study prove that, （1） Under the extreme condition of the hydro-geologic parameters, it would be possible for the maximum total phosphorus concentration to get stabilized when the tailings reservoir may experience a leaking period of 1 001 days; （2） There may likely exist a reciprocate nexus between the thickness of the confined aquifer and the maximum total of the phosphorus concentration, which tends to change with the confined aquifer thickness faster when the confined aquifer is less thick than 10 m, which is likely to result in a greater forecast error of the said maximum total phosphorus concentration; （3） Under the extreme surroundings of the other parameters, the total maximum phosphorus concentration tends to decrease with the increase of the flowing velocity of the confined aquifer if it is greater than 0.076 23 m/d. However, if the flow velocity of the confined aquifer varies between 0.14 m/d and 0.51 m/d, it may lead to smaller errors in the forecast as in our case study; （4） The total maximum phosphorus concentration tends to decrease with the increase of the diffusion coefficient of the confined aquifer. Such a total maximum phosphorus concentration can be divided into rapid decline, slow decline and the stage of stable balance. Therefore, as is seen in our case study, suppose that the diffusion coefficients of the confined aquifer vary between 3.92 m^2 /d and 8.92 m^2 /d, it can be concluded that the maximum total phosphorus concentration should be decreasing rapidly wi

关 键 词：环境科学技术基础学科 地下水动力学 平面连续点源 地下水溶质运移 承压含水层 扩散系数 

分 类 号：P641.8[天文地球—地质矿产勘探] X828[天文地球—地质学]