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Environmental Geophysics: A Practical Guide by Professor Dr. rer. nat. Dieter Vogelsang (auth.)

By Professor Dr. rer. nat. Dieter Vogelsang (auth.)

Applied geophysics have been built to discover the uncooked fabrics wanted by way of civilization. this present day it really is used to enquire the level and nature of buried infected waste and leachates.
The e-book describes intimately, but in an easy language, percentages, merits and shortcomings of geophysical equipment. Case histories from the USA and around the world are mentioned and richly illustrated, and price estimates for geophysical surveys and standards for the alternative of equipment and the compilation of tenders are provided.
The ebook will allow engineers, scientists and legal professionals to appraise the probabilities of geophysics within the overview of environmental risks.

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Environmental Geophysics: A Practical Guide

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Extra resources for Environmental Geophysics: A Practical Guide

Sample text

Its main purpose is to locate the depth at which ground water flows into a well. During a pumping test, the probe is lowered at a constant speed and continuously records the velocity of vertical flow. Whenever it passes a water-producing depth, the revolutions will decrease. Thereby, the depth of the inflow is well marked. Flowmeter data, which are reduced by the cable speed, allow the computation of the share of the total production each producing layer has. This production can even be negative, if, for example, water flows out of the hole into a zone of fractured hard rock.

Often, information about deeper layers is desired, even for the solution of environmental problems. For example, the structures that control the flow of contaminated plumes should be followed to greater depth to assess the danger of widespread underground contamination. In such cases, reflection surveys are well suited to trace stratigraphically and/or tectonically marked seepage paths. The evaluation of digital registered reflections has to deal with huge amounts of data. The following steps are customary: I.

2. 3. 4. 5. 6. 7. 8. Editing (control of field values) Demultiplexing (lines ~columns) Correction of amplitudes (~common level) Static correction (topography, overlayers) CDP sorting (reference to common midpoint) Stacking (summation of singular seismograms) Deconvolution (elimination of multiple reflections) Bandpass filtering (elimination of noise) After the evaluation follows the digital interpretation, which implies the processing of great volumina of evaluated data. It can be done only by very fast computing systems with large memory capacities.

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