View and Download PowerPoint Presentations on ELECTRICALRESISTIVITY METHOD OF GEOPHYSICAL EXPLORATION PPT. Now customize the name of a clipboard to store your clips. Traditionally, this has been done using one-dimensional (1D) vertical electrical sounding (VES) surveys. As for groundwater potentiality, the second … If you continue browsing the site, you agree to the use of cookies on this website. Although there is … Find PowerPoint Presentations and Slides using the power of XPowerPoint.com, find free presentations about ELECTRICALRESISTIVITY METHOD OF GEOPHYSICAL EXPLORATION PPT. Electrical Resistivity Method: In this method the electrical resistivity of the formations is measured by passing a current. See our User Agreement and Privacy Policy. 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). Exploration for groundwater, which is one of the most valuable natural resources and is vital for the sustenance of life on earth, requires a number of techniques , , . It is therefore suggested that geophysical methods, most especially the electrical resistivity method, along with geological methods should form an integral part of groundwater exploration programs in solving complex geohydrological problems associated with ground water occurrence and resource development. You can change your ad preferences anytime. As you know from our Groundwater Education Series , an aquifer is a natural underground … Well today, we're teaching you the best way we know how to find groundwater—Electrical Resistivity Imaging. 2. If you continue browsing the site, you agree to the use of cookies on this website. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. ρ= ( ) ρ is resistivity in ohm-cm, R is resistance in ohms, A is the cross sectional area (cm … 5 ... PowerPoint Presentation Created Date: Resistivity and Induced Polarization (IP) are commonly-used geophysical survey methods for measuring the electrical properties of subsurface rock. Note the low resistivity (about 0.2 ohm•m) of sea water due to the relatively high salt content. Electrical Method Electrical resistivity method is based on the difference in the electrical conductivity or the electrical resistivity of different soils. VES u… See our Privacy Policy and User Agreement for details. Clipping is a handy way to collect important slides you want to go back to later. Its units are ohm-m 2 /m or simply ohm-m. Centre for Advanced Studies in Earth Science, 10601035 Under the guidance of PROF. J.K PANI PROF. A.K PRADHAN DEPARTMENT OF CIVIL ENGINEERING Electrical Resistivity Tomography (ERT) is a versatile method in the geophysics toolbox; suitable for a broad range of applications and environments such as groundwater prospecting and contamination, mineral exploration, geological mapping and geotechnical investigations. GEOPHYSICAL INVESTIGATION ELECTRICAL METHODS. ELECTRICAL METHODS. Electrical Resistivity Method (ERM) is one of geophysical tool that offer very attractive technique for subsurface profile characterization in larger area. The resistivity of subsurface rock formations is one of the physical properties determined through the process of logging that is performed on most oil and gas wells, utilizing instrumentation inserted into the wellbore. The resistivity is inversely proportional to the rock porosity and its water saturation. Electrical resistivity surveying methods have been widely used to determine the thickness and resistivity of layered media for the purpose of assessing groundwater potential and siting boreholes in fractured unconfined aquifers. Gravity and magnetic (discussed below) methods detect only lateral contrasts in density or magnetization, respectively. You can change your ad preferences anytime. BY The three main methods of electric resistivity surveys are vertical electric sounding (VES), electric profiling, and electric imaging. Advances in geophysical methods are needed to improve cost effectiveness and to enhance solutions of geologic problems. Resistivity surveys carried out in areas of around Bekal, Mogral, Kumbla, Shiriya, Valiyaparamba, Pulimoottil, and Chal of Kasaragod and Kannur districts of Kerala. 1. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 2-Induced Polarization (IP) - This is an active method that is commonly done in conjunction with DC Resistivity. PROF. A. BALASUBRAMANIAN There is no wholly satisfactory electrical system from the standpoint of resolution of subsurface resistivity configuration at the required scale, depth of … Site characterization through electrical properties of the ground itself. EXPLORATION OF GROUND WATER USING ELECTRICAL RESISTIVITY METHOD A Thesis submitted to the National Institute of Technology, Rourkela In partial fulfilment of the requirements of Bachelor of Technology (Civil Engineering) ASHVIN KUMAR MEENA Roll No. From their research came what is now one of the most common methods of groundwater exploration, vertical electrical sounding (VES). The resistivity (P) of a material is given by- Where, R is the resistance, A is the area of cross-section and L is its length. The usual practice in the field is to apply an electrical direct current (DC) between two electrodes implanted in the ground and to measure the difference of potential … • Resistivity method • Induced polarization method (IP) • Self-potential (SP) method ... • Exploration of metalliferous mineral deposits • Detection of water circulation into the ground • Monitoring dams or tank integrity. In Ghana, the method has been used for groundwater exploration to improve success rates in the Voltaian Sedimentary Basin (Chegbeleh et al., 2009). Download groundwater exploration surface geophysical methods electric resistivity withdrawal PPT for free. The resistively method is designed to give information about the electrical conductivity of the earth’s rocks. It utilizes direct currents or low frequency alternating currents to investigate the electrical properties (resistivity) of the subsurface. Get ideas for your own presentations. 2- Active Techniques. 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. The Each of these utilize one of the array configurations mentioned above. The resistivity method is used in the study of horizontal and vertical discontinuities in the electrical properties of the ground. depending on the concentration of dissolved salts. The concept of formation resistivity plays an important part in log analysis. The gravity method also enables a prediction of the total anomalous mass (ore tonnage) responsible for an anomaly. The method allows a quantitative result to be obtained by using a controlled source of specific dimensions. If you continue browsing the site, you agree to the use of cookies on this website. View Geophysical Study Resistivity Method PPTs online, safely and virus-free! Looks like you’ve clipped this slide to already. Studies have showed that groundwater could be explored using electrical resistivity methods (Olorunfemi and Fasoyi, 1993; Olasehinde, 1999; Alile et al., 2008). In contrast, electrical and seismic methods can detect vertical, as well as lateral, contrasts of resistivity As, the water content and its distribution change the electrical properties of the rocks. 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 … Methodology The electrical resistivity technique is a preferable geophysical technique for groundwater exploration. The electrical resistivity survey and electromagnetic methods have been used in groundwater studies because of the close Applicable alternative technique in groundwater exploration such as ERM which complement with existing conventional method may produce comprehensive and convincing output thus effective in terms of cost, time, data coverage and … The electrical resistivity method is useful in this regard, as it is an efficient and economical method for determining the presence of groundwater . well known method used in groundwater exploration. lows. University of Mysore Vertical Electric Sounding. See our Privacy Policy and User Agreement for details. Groundwater Exploration Methods To best understand how electrical resistivity surveys for groundwater exploration work today, it’s important to understand where resistivity testing began. 2. i. Surface electrical resistivity surveying is based on the principle that the distribution of electrical potential in the ground around a current-carrying electrode depends on the electrical resistivities and distribution of the surrounding soils and rocks. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Common applications of resistivity surveying Groundwater exploration Mineral exploration, detection of cavities Oil exploration Waste site exploration Electrical methods employ a variety of measurements within the Earth. The application, interpretation, and understanding of electrical methods requires a familiarity with the relationship between soil and rock characteristics and the resistivities obtained from electrical data. Electrical resistivity methods. This makes the resistivity method an ideal technique for mapping the saline and fresh water interface in coastal areas. The resistivity of rock formation gives an indication of the presence of groundwater. Share yours for free! See our User Agreement and Privacy Policy. 1- Passive Techniques. 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. Source of specific dimensions your LinkedIn profile and activity data to personalize ads to! Ppt for free handy way to collect important slides you want to go back later... Of Mysore Mysore resistivity plays an important part in log analysis below ) methods detect only lateral contrasts in or. Rock formation gives an indication of the subsurface electrical resistivity method for groundwater exploration ppt 're teaching you the best way we know how to groundwater—Electrical! 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