MODFLOW中两种模拟混合井流问题方法的耦合

王全荣; 唐仲华; 翟莉娟

MODFLOW中两种模拟混合井流问题方法的耦合

The improved approach coupling two methods in MODFLOW to simulate a multiaquifer well

WANGQuan-rong,

摘要

摘要: 对于无(弱)水力联系的多含水层,混合井改变了含水层的结构,通过井筒将无(弱)水力联系的含水层联通。对于大区域井流问题数值模拟,MODFLOW中显式流量分配法和"High Kv in Wellblock"法的假设条件都很难得到满足,将两者耦合起来拓展其适用范围。采用质量守恒定理和Darcy定律计算井网格的平均等效渗透系数,结合显式流量分配法模拟混合井流问题。最后,通过两个典型算例来验证该方法的合理性,其中一个算例是非完整井穿透相邻的两个含水层,另一个算例是完整井穿透两个含水层,且中间有隔水层。将耦合法的计算结果与显式流量分配法对比,结果表明:只有在第一个例子中当水流达到稳定时,两种方法的计算结果几乎相同,且井网格的水头差很小;而其它情况两者的差别很明显,且采用流量分配法计算井网格的水头差大于耦合法计算井网格的水头差。根据Neville等的相关结论可知采用耦合法对于文中的两个例子都比较合理。

Abstract: For a multiaquifer system where there is aquitard or aquiclude,multiaquifer wells change the physical system of a aquifer by establishing direct hydraulic links between units that are otherwise isolated. Therefore,how to establish the mathematic model is the one of the key research problems. For the large scale simulation,the hypothesis of discharge allocation method and "High Kv in Wellblock" method in MODFLOW can not be satisfied. Therefore two approaches are coupled to enlarge the extent of a...

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