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对于具有一定走向长度的三维地质构造模型而言,若用一般点源三维的数值解法求解电场时,由于方程数目过多,需要用贮存能力很大的计算机才能完成。为了使上述问题能在较小型或中型计算机上进行计算,芬兰地球物理调查所的L·Eskola和H·Hongisto等人提出了一种在三维点源激发下,求解电导率为各向异性的2(1/2)维模型电场问题的方法。它们用一个走向长度有限的圆柱体来表示2(1/2)维模型,并忽略圆柱体两个底面对电场的作用。在垂直柱体走向的平面中,模型的边界是用任意指向的多边
For a three-dimensional geological structure model with a certain length of orientation, if the three-dimensional numerical solution of the general point source is used to solve the electric field, the number of equations needs to be increased by a computer with a large storage capacity. In order to make the above problems computable on smaller or medium-sized computers, L · Eskola and H · Hongisto et al. Of the Finnish Geophysical Survey proposed a method for solving conductivity anisotropy 2 (1/2) dimensional model of the electric field problem. They represent a 2 (1/2) -dimensional model with a cylinder of finite length and ignore the effect of the two bottoms of the cylinder on the electric field. In the plane of the vertical cylinder, the boundary of the model is an arbitrary directed polygon