A Study of the Anomaly Genesis for the Frequency Selection Method in a Natural Electric Field of a Karst Body
详细信息
- 责任者：Yang Tianchun (College of Civil Engineering ; Hunan University of Science and Technology ; Xiangtan 411201 ; China) ; Zhang Hui
- 刊名：Hydrogeology and Engineering Geology
- 出版年：2013
- 卷期：40(5)
- 关键词：大地电磁法 ; magnetotelluric methods ; 岩溶水 ; karst water
- 页码：p.22-28
- 图表：5 illus., 17 refs.
- 分类号：1600
- issnNo：ISSN1000-3665
- isbnNo：CN11-2202/P
摘要
On the basis of in situe detection,the main purpose of this paper is to study the anomaly genesis of the frequency selection method.In situ detection is performed in a water-filled cave,and practical anomaly curves are obtained.Based on the Maxwell equations and the boundary conditions,magnetic vector potential of a low resistivity sphere or a horizontal cylinder in a homogeneous harmonious vertical magnetic field is solved.The analytic expressions of an induced electric field outside the abnormities are obtained.Parameters of the model are assumed,and anomaly profiles of the induced electric field are also obtained.Results between practical prospecting curves are compared with theoretical simulating curves,and similar characteristics are indicated.The anomaly genesis of the frequency selection method is induced in the natural electric field for a water-filled low resistivity abnormity.The induced natural electric field is one of the important factors causing anomalies.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |