Most of water conservancy and hydropower projects are located in deep valley,and most of them are cliffy and have difficult transportation.It is difficult for ground geophysical surveying in this conditions.But seismic waves,electromagnetic wave CT tomography survey can get good results by making full use of topographic conditions,exsiting tunnel,drilling and other geological engineering facilities.This technique helps to increase the precise of exploration,meanwhile it also reduces the cost of survey.
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