地下水溶质运移解析法的近似求解

发布时间：2018-04-26 00:17

本文选题：IDL + 坐标系旋转　；参考：《人民黄河》2017年12期

【摘要】：地下水溶质运移解析法是地下水环境影响评价中常采用的一种预测方法。对于实际地下水环境影响评价工作而言,手工查表插值计算显得非常困难,计算机编程语言为解决这一问题提供了方便。以应用最广泛的一维稳定流动二维水动力弥散问题中的连续注入示踪剂-平面连续点源计算公式为例,借助IDL编程语言实现计算公式中第一类越流系统井函数以及第二类零阶修正贝塞尔函数的近似求解,并通过坐标系旋转变换得到与地下水流动方向相一致的污染物浓度值。结果表明:IDL语言结合Surfer软件可以实现地下水溶质运移方程解析解的快速、连续、稳定求解和求解结果的可视化,且所得解析解误差小、精度高,污染物运移方向满足地下水环境影响评价中实际预测的要求。
[Abstract]:The analytical method of solute transport in groundwater is often used in groundwater environmental impact assessment. For the actual groundwater environmental impact assessment, it is very difficult to calculate the table by hand, and the computer programming language is convenient to solve this problem. Taking the calculation formula of continuous injection tracer-planar continuous point source for the most widely used one-dimensional steady flow two-dimensional hydrodynamic dispersion problem as an example, The well function of the first kind of cross flow system and the second kind of zero order modified Bessel function in the calculation formula are solved by IDL programming language, and the pollutant concentration values consistent with the direction of groundwater flow are obtained by the rotation transformation of coordinate system. The results show that the analytical solution of solute transport equation of groundwater can be realized by using Surfer software, which is rapid, continuous, stable and visualized, and the error of the analytical solution is small and the accuracy is high. The direction of pollutant transport meets the requirement of actual prediction in groundwater environmental impact assessment.
【作者单位】：中国辐射防护研究院;
【分类号】：P641.69

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