Screen LibraryEveryday applied geophysics. 1, Electrical methods /
Everyday Applied Geophysics 1 covers the physical methods permitting the environmental exploration of the sub-surface in 1, 2, 3 or 4 dimensions (the last is for time-lapse in terms of physical environmental state and geometry). The ground is transparent to electrical currents, electromagnetic induc...
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| Published: |
Elsevier : ISTE Press,
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| Publisher Address: | London ; Kidlington, Oxford : |
| Publication Dates: | [2018] |
| Literature type: | eBook |
| Language: | English |
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| Online Access: |
https://www.sciencedirect.com/science/book/9781785481994 http://www.sciencedirect.com/science/book/9781785481994 |
| Summary: |
Everyday Applied Geophysics 1 covers the physical methods permitting the environmental exploration of the sub-surface in 1, 2, 3 or 4 dimensions (the last is for time-lapse in terms of physical environmental state and geometry). The ground is transparent to electrical currents, electromagnetic induction, magnetic fields and seismic (acoustic) waves. All extend our senses by using the propagation of these phenomena through underground materials. The book specifically addresses the methods feasible, accessible and affordable to all users, and provides simple apparatus electronic diagrams. The book also features open-source and free software links for data interpretation. Covers physical methods permitting the environmental exploration of the sub-surface in 1, 2, 3 or 4 dimensionsAddresses the methods feasible, accessible and affordable to all usersProvides simple apparatus electronic diagrams, as well as open-source and free software links for data interpretation. |
| Carrier Form: | 1 online resource |
| Bibliography: | Includes bibliographical references and index. |
| ISBN: |
9780081019672 008101967X 1785481991 9781785481994 |
| Index Number: | QC806 |
| CLC: | P3 |
| Contents: |
Introduction and General Points -- Introduction: the audience of this book -- What is applied (or subsurface) geophysics? -- spirit of this book: affordable methods on a technological and financial level -- example to begin -- Drawing maps in isovalues -- Direct method, inverse method -- Sampling quantities on the surface, and which resolution can be reached underground? -- General points about measuring protocols -- issue of the measuring grid -- question of georeferencing -- Mapping types of prospecting: point-by-point, "walking" or drones -- Adapting the models to the targets -- Direct Current Electrical Methods -- electricity used in geophysics -- current flowing in the ground -- Resistivity -- Separating volume conductivity from surface conductivity -- Ground resistance -- first approach using hemispherical electrodes -- Realistic electrodes: metal posts -- basic array for electrical prospecting -- Stage 1: what is the potential at the distance (r) from the electrode? -- Stage 2: describing "point" electrodes in more detail -- Stage 3: setting up all the electrodes: two transmitting electrodes and two measuring electrodes -- Stage 4: guarding against intruders -- Dangers involved in electrical prospecting and safety regulations and rules -- Apparent resistivity -- note about reciprocity -- Arrays in electrical prospecting: depth of investigation and sensitivity -- Depth of investigation and sensitivity -- Electrical resistivity tomography -- ERT arrays and sequences -- Using the programs RES2DMOD and RES2DINV -- 3D tomography -- Direct current electrical resistivity mapping -- Vertical electrical sounding (VES, or in short, elec |