Search for dissertations about: "Electrical Resistivity Tomography"

Showing result 1 - 5 of 11 swedish dissertations containing the words Electrical Resistivity Tomography.

2. 1. Advances in time–domain induced polarisation tomography : Data acquisition, processing and modelling

   Author : Per-Ivar Olsson; Teknisk geologi; []
   Keywords : Tomography; Signal–to–noise ratio; Waveform; Duty–Cycle; induced polarisation; Electrical properties;

   Abstract : What would you find below your feet – how do you find out? Perhaps you could look at a geological map, drill, or dig? That could work, but sometimes the maps are not detailed enough, and digging everywhere to find out is impractical. Imagine if you could develop a method that allows you to see straight through the ground, as x–rays through the body! To some extent, such methods already exist; you can for example send electric current into the ground that tells you what lies beneath when it returns. READ MORE

4. 2. Characterization of Hydrogeological Media Using Electromagnetic Geophysics

   Author : Niklas Linde; Laust B. Pedersen; Max A. Meju; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geophysics; Hydrogeophysics; radio magnetotellurics; ground penetrating radar; electrical resistance tomography; inversion; regularization; geostatistics; electrical anisotropy; fractured rock; Geofysik; Geophysics; Geofysik;

   Abstract : Radio magnetotellurics (RMT), crosshole ground penetrating radar (GPR), and crosshole electrical resistance tomography (ERT) were applied in a range of hydrogeological applications where geophysical data could improve hydrogeological characterization. A profile of RMT data collected over highly resistive granite was used to map subhorizontal fracture zones below 300m depth, as well as a steeply dipping fracture zone, which was also observed on a coinciding seismic reflection profile. READ MORE

5. 3. Natural and Controlled Source Magnetotelluric Data Processing and Modeling

   Author : Chunling Shan; Thomas Kalscheuer; Laust Pedersen; Mehrdad Bastani; Thorkild Rasmussen; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geophysics; Airborne Electromagnetic Method; Radio Magnetotellurics; Controlled Source Magnetotellurics; Electrical Resistivity Tomography; Moving Magnetotellurics; 2D inversion; 3D inversion;

   Abstract : In this thesis, four studies using different geophysical electromagnetic methods are presented. In the first study dealing with airborne measurements, the noise response due to the rotation of the aircraft and the aircraft itself as a metallic conductive body on the Earth's electromagnetic response in very low frequency and low frequency band was investigated. READ MORE

6. 4. Joint inversion and integration of multiple geophysical data for improved models of near-surface structures

   Author : Shunguo Wang; Alireza Malehmir; Mehrdad Bastani; Thomas Kalscheuer; Mark Everett; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; joint inversion; ERT; RMT; CSRMT; boat-towed; tomography; Geofysik med inriktning mot fasta jordens fysik; Geophysics with specialization in Solid Earth Physics;

   Abstract : Geophysical methods are non-invasive and allow an effective way of understanding subsurface structures and their physical properties. One of the main challenges is the often non-uniqueness of the geophysical models and that several different models can explain a dataset to an agreeable fit. READ MORE

7. 5. Advances in time-domain induced polarization monitoring with application on chlorinated solvents contamination : Towards scalable real-time geophysical monitoring

   Author : Aristeidis Nivorlis; Teknisk geologi; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Geoelectrical monitoring; Chlorinated solvents; geophysics; Electrical resistivity tomography ERT ; Contaminated soil; contamination remediation geophysics;

   Abstract : Environmental pollution is a significant concern for scientists, practitioners, authorities and the society. Among the various pollutants, chlorinated solvents pose a considerable risk to our groundwater resources. READ MORE