地下多个异常体电磁散射的数值模型

NUMERICAL MODEL FOR ELECTROMAGNETICSCATTERING OF A NUMBER OF UNDERGROUNDANOMALOUS BODIES

本文针对地下两孔电磁法的实际,建立多异常体(包括非均匀异常体)散射的数值模型。给出一种使计算机程序具有一定通用性的处理分块序号与坐标关系的方法。用矩量法解体积分方程,并采用合适的近似公式,计算出不同工作频率下各种异常体散射的场分布。由计算结果可得出一些对解释实测数据有参考价值的结论。

Abstract: In accordance with the reality of the two-hole electromagnetic method, the authors have established a numerical model for the scattering of a number of anomalous bodies (including nonuniform anomalous bodies). A method for handling relationship between serial number of blocking and coordinate is given, which renders the computer program commonly usable to some extent. The moments method is used to solve the volume integral equation; appropriate approximate formulae are adopted to calculate the distribution of scattering fields of various anomalous bodies under the condition of different working frequencies. From the calculations some conclusions may be drawn which are worth considering in the interpretation of measured data.