瞬变电磁法测量中地形改正方法探讨

A Discussion on the Landform Rectified Way in the Measurement of Transient Electromagnetic Method

瞬变电磁法在工程、水文及金属矿产勘探等方面正日益得到广泛的应用。在地形复杂地区 ,物探异常的准确定位不可避免地受地形因素的影响。笔者通过大量的工作实践 ,提出了用法线进行地形改正的方法。对重叠回线装置而言 ,法线是垂直于回线平面、并通过线框中心点的一条直线。通过专用软件换算出每个测点上的各道电位值所对应的视深度和视电阻率值 ,沿法线方向投影到作图面上 ,从而达到地形改正的目的。

Transient electromagnetic method increasingly has been applied in the fields of engineering,hydrology and metallic mineral exploration. For the regions of complex topography,the accurate orientation of geophysical anomaly unavoidably is influenced by the landform. Through author's numerous practical operations,the way in employing normal in landform rectification is advanced. In terms of the normal-wrapping installation,the normal is a straight line through the center point of linear framework. The visual depth and visual resistivity corresponding to the electric potential value of every track of each determined point are converted by the special software,and are projected on the constructive plan along the normal orientations,further obtaining the corrective aims.