电磁测深EH-4在水电站岩溶探测中的有效性

通过介绍EH-4电磁测深的方法原理，论证了该方法在探测岩溶方面的有效性；通过对可以代表我国陆地地理范围内的高频大地电磁信号特征的26个高频大地测深点的观测和分析，得出了大地电磁场基本稳定可靠的结论，并总结出大地电磁场弱信号频带，便于在实际工作中使用人工场源对此频带信号进行加强弥补、使探测结果准确和完善；文章最后列举具体工程实例，展示了该方法在岩溶探测方面的成功应用。

Validity of EH-4 electromagnetic sounding for Karst detecting in hydropower development project

The validity of EH-4 electromagnetic sounding for Karst detecting is demonstrated herein based on its working principle, in which the conclusion of that the magnetotellurie field being stable and reliable basically is obtained through the observation and analysis on 26 high frequency magnetotellurie sounding points with high frequency magnetotellurie signals within the geographical area of the land in our country. Furthermore, the band with weak frequency are summarized, so as to make it compensated with the source from the man-made field in the actual ease for making the sounding results more correct and perfect. At last, an engineering case is given, which shows the successful application of the method to the Karst detecting for Hongjiadu Hydropower Project.