We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Share yours for free! Looks like you’ve clipped this slide to already. The gravity method also enables a prediction of the total anomalous mass (ore tonnage) responsible for an anomaly. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The method allows a quantitative result to be obtained by using a controlled source of specific dimensions. 1- DC Resistivity - This is an active method that employs measurements of electrical potential associated with subsurface electrical current flow generated by a DC. The electrical resistivity survey and electromagnetic methods have been used in groundwater studies because of the close Centre for Advanced Studies in Earth Science, The electrical resistivity method is useful in this regard, as it is an efficient and economical method for determining the presence of groundwater . I have published numerous papers on various subjects, including geophysical methods for the detection of underground voids, road radar for pavement investigations, geophysical methods for seismic site classification, and the use of electrical resistivity methods for the aggregate industry. 1. Electrical resistivity method is one of the most useful techniques in groundwater geophysical exploration, because the resistivity of rocks is sensitive to its ionic content (Alile, et al., 2011). Electrical resistivity methods. After attending this module, the user would be able to know about the most popular methods of groundwater exploration. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The electrical resistivity method is most widely accepted and used in ground water exploration. Find PowerPoint Presentations and Slides using the power of XPowerPoint.com, find free presentations about ELECTRICALRESISTIVITY METHOD OF GEOPHYSICAL EXPLORATION PPT. ρ= ( ) ρ is resistivity in ohm-cm, R is resistance in ohms, A is the cross sectional area (cm … See our Privacy Policy and User Agreement for details. Gravity and magnetic (discussed below) methods detect only lateral contrasts in density or magnetization, respectively. INVESTIGATION Note the low resistivity (about 0.2 ohm•m) of sea water due to the relatively high salt content. Resistivity is defined as resistance in ohms between the opposite phases of a unit cube of a material. GEOPHYSICAL INVESTIGATION ELECTRICAL METHODS. You can change your ad preferences anytime. In Ghana, the method has been used for groundwater exploration to improve success rates in the Voltaian Sedimentary Basin (Chegbeleh et al., 2009). 2- Active Techniques. The resistivity is inversely proportional to the rock porosity and its water saturation. See our Privacy Policy and User Agreement for details. In resistivity method the current is driven through the ground using a pair of electrodes and the resulting distribution of the potential in the ground is mapped by using another pair of electrodes connected to a sensitive voltmeter. If you continue browsing the site, you agree to the use of cookies on this website. View and Download PowerPoint Presentations on ELECTRICALRESISTIVITY METHOD OF GEOPHYSICAL EXPLORATION PPT. It utilizes direct currents or low frequency alternating currents to investigate the electrical properties (resistivity) of the subsurface. Exploration for Groundwater Aquifers, using Vertical Electrical Sounding (VES) method, in Wad Hamid area – River Nile State, Sudan Mohammed Adam Ginaya1, Abbas Musa Yagoob2 Department of Water Resources Engineering, College of Water Engineering & Environment, Sudan … Values obtained are interpreted to understand the nature of formations using one-dimensional ( 1D ) vertical electrical (. Density or magnetization, respectively are interpreted to understand the nature of.! Resistivity Imaging or low frequency alternating currents to investigate the electrical properties of the total anomalous mass ( ore ). Exploration, vertical electrical sounding ( VES ), electric profiling, and to provide you with relevant advertising fresh! ( ore tonnage ) responsible for an anomaly method allows a quantitative result to be by... 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