scholarly journals Integration of geophysical, hydrogeological and geospatial analysis for groundwater assessment in Chotanagpur Granite-Gneiss Complex, Ranchi

2021 ◽  
Author(s):  
Gaurav Kumar ◽  
Dewashish Kumar ◽  
Pratibha Warwade
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Groundwater Resources ◽  
Regional Scale ◽  
Granite Gneiss ◽  
Resistivity Tomography ◽  
Weighted Overlay ◽  
Gneiss Complex ◽  
Aquifer Systems ◽  
Groundwater Assessment

Integrated study combining electrical resistivity tomography, geology, hydrogeomorphology, and weighted overlay analysis of various surface and subsurface thematic layers proved to be a very useful tool for evaluating the heterogeneous hard aquifer systems for groundwater assessment and development. A comprehensive study was carried out at representative and varied geological settings viz., Chotanagpur Granite-Gneiss Complex (CGGC), Ranchi has been accomplished from geology and geophysical datasets. The electrical resistivity tomography results revealed potential target zones at three sites in the study area up to a maximum of 170 m depth with a large variation in aquifer resistivity ranging from 80 to 800 Ω.m. These significant findings depicted a good correlation and are validated with the lithology in the surrounding of the resistivity tomography results. Nevertheless, the weighted overlay technique act as an essential tool for spatial analysis and interpretation of potential groundwater zones in the study area as well as validated the geophysical depth models whereas in-depth study on geology and hydrogeomorphology provides a detailed hydrogeological scenario throughout the study area for the long-term sustainability of the groundwater resources both at a local and in regional scale in the typical hard rock aquifer system.

scholarly journals Characterization of aquifer system using electrical resistivity tomography (ERT) and induced polarisation (IP) techniques

2021 ◽  
Vol 880 (1) ◽  
pp. 012025
Author(s):  
N Akhtar ◽  
M S Mislan ◽  
M I Syakir ◽  
M T Anees ◽  
M S M Yusuff
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Imaging System ◽  
Borehole Data ◽  
Resistivity Tomography ◽  
Aquifer System ◽  
Saturation Zone ◽  
Average Percentage ◽  
Aquifer Systems ◽  
Freshwater Resource

Abstract Groundwater plays a major role as an alternative freshwater resource for irrigation and industrial purposes. This study aimed to characterize the subsurface of aquifer systems in TelukIntan district, Perak, Malaysia using Electrical Resistivity Tomography (ERT) and Induced Polarization (IP) methods. The horizontal profiling (TL1 and TL2) was conducted at length of 400 m. The estimated depth is 150 m below ground level (b.g.l.). An ABEM SAS 4000 Terrameter and ABEM LUND ES464 Imaging System were applied to create a resistivity pseudo-section using polar-dipole configuration. The collected geo-electrical data was interpreted using RESIST software with partial curve matching and computer iteration. ERT and IP survey profile results were validated with in-situ borehole data from borehole 2 (B2). Eleven samples of soil profile were collected at depth from 5.6 m to 61.2 m, with average percentage of sand, silt and clay are 93.77 %, 5.78 % and 0.02 %, respectively. The geology of subsurface settings is the key factor in determining the aquifer system characterized by interlayer sand-silt sequence indicating the saturation zone of aquifer underlain by shale at the bottom. Further study on hydraulics perspective is important to understand the overall capacity of the aquifer.

scholarly journals Hydrogeophysical Investigation for Groundwater Resources from Electrical Resistivity Tomography and Self-Potential Data in the Méiganga Area, Adamawa, Cameroon

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Meying Arsène ◽  
Bidichael Wahile Wassouo Elvis ◽  
Gouet Daniel ◽  
Ndougsa-Mbarga Théophile ◽  
Kuiate Kelian ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Groundwater Resources ◽  
Shallow Groundwater ◽  
High Elevation ◽  
Groundwater Potential ◽  
Resistivity Tomography ◽  
South Central ◽  
Exploration And Production ◽  
Self Potential

Exploration and production of groundwater, a vital and precious resource, is a challenging task in hard rock, which exhibits inherent heterogeneity. A geophysical survey was conducted in Méiganga, Mbéré department, in the Adamawa region, Cameroon. High-resolution electrical resistivity tomography (ERT) and self-potential (SP) dataset were collected in a gneissic terrain to solve the groundwater problem as people are facing acute shortage of drinking water in the study area. The analysis and interpretations based on resistivity models revealed substantial resistivity contrast between the altered gneiss that might contain water and massive gneiss and delineated five deeper groundwater prospects zones located at Yelwa, Ngoa-Ekélé, Sabongari, Ngassiri, and Gbakoungué, respectively. Nevertheless shallow groundwater zones (<13 m) are located in the northern part of the study area at high elevation while best prospect and productive groundwater zones lying between 20 and 25 m depth are at low elevation in the southern part. On the other hand, analysis of SP negative peaks along with groundwater head and groundwater vector maps revealed areas of recharge and discharge across the study area. The discharge areas serve as groundwater collection center and are good groundwater potential zones. In addition these maps revealed that groundwater flow pattern shows inward flow from the flanks to center and south central parts of the study area.

scholarly journals Imaging the extent of saltwater intrusion in the Luy river coastal aquifer (Binh Thuan) using electrical resistivity tomography (ERT)

2021 ◽  
Author(s):  
Cong-Thi Diep
Keyword(s):  
Electrical Resistivity ◽  
Coastal Aquifer ◽  
Saltwater Intrusion ◽  
Electrical Resistivity Tomography ◽  
Salt Water ◽  
Groundwater Resources ◽  
Left Bank ◽  
Resistivity Tomography ◽  
South Central ◽  
Recharge Sources

&lt;p&gt;&lt;strong&gt;Imaging the extent of salt water intrusion in the Luy river coastal aquifer (Binh Thuan) using electrical resistivity tomography (ERT)&lt;/strong&gt;&lt;/p&gt;&lt;p&gt;Diep Cong-Thi&lt;sup&gt;1,3&lt;/sup&gt;, Linh Pham Dieu&lt;sup&gt;1,3&lt;/sup&gt;, Robin Thibaut&lt;sup&gt;1&lt;/sup&gt;, Marieke Paepen&lt;sup&gt;1&lt;/sup&gt;, Hieu Huu Ho&lt;sup&gt;3&lt;/sup&gt;,&lt;/p&gt;&lt;p&gt;Fr&amp;#233;d&amp;#233;ric Nguyen&lt;sup&gt;2&lt;/sup&gt;, Thomas Hermans&lt;sup&gt;1&lt;/sup&gt;&lt;/p&gt;&lt;p&gt;&lt;sup&gt;&amp;#160;&lt;/sup&gt;&lt;/p&gt;&lt;p&gt;&lt;sup&gt;1&lt;/sup&gt;Department of Geology,&lt;sup&gt;&lt;/sup&gt;Ghent University, 9000-Gent, Belgium&lt;/p&gt;&lt;p&gt;&lt;sup&gt;2 &lt;/sup&gt;Department of Urban and Environmental Engineering,&lt;sup&gt;&lt;/sup&gt;Liege University and Department of Civil Engineering, KU Leuven, B- 4000 Li&amp;#232;ge and 3000 Leuven, Belgium&lt;/p&gt;&lt;p&gt;&lt;sup&gt;3 &lt;/sup&gt;Department of Marine Geology, Vietnam Institute of Geosciences and Mineral Resources (VIGMR), 100000 Hanoi, Vietnam&lt;/p&gt;&lt;p&gt;&amp;#160; ABSTRACT&lt;/p&gt;&lt;p&gt;Seawater intrusion has been one of the most concerning issues of the Vietnam South Central provinces in recent years, especially in the Binh Thuan province which is characterized by a hyper-arid climate. During the dry season extending from November to April, seawater intrudes through estuaries and threatens groundwater resources. The latter are under increasing pressure due to water extraction for agri- and aquaculture. To evaluate the current state of salinity in the shallow coastal aquifer, 21 electrical resistivity tomography (ERT) measurements were collected along the downstream part of the Luy river based on the previous saltwater intrusion boundary which was estimated from water samples collected from shallow boreholes. The data were inverted to get the resistivity distribution of the subsurface and interpreted in terms of salinity. Comparison with well data shows that resistivity values below 6.5 Ohm.m correspond to the presence of saltwater in the aquifers. On the right bank of the river, a higher elevation dune area contains a freshwater aquifer which limits the intrusion of saltwater. On the left bank dominated by lowland areas, saline water fills almost the entire thickness of the aquifer, except locally for small thin freshwater lenses. At larger distances from the sea, the aquifer displays a complex distribution of fresh and saline lenses. Those variations seem to be correlated with the presence of clay lenses, recharge sources and irrigation practices. ERT data also reveals the depth of the rock basement. The geophysical observations show that the extension of saltwater intrusion is much larger and more complex than expected from existing borehole data and is not limited to interaction with the river.&lt;/p&gt;&lt;p&gt;KEYWORDS: saltwater intrusion, groundwater, electrical resistivity tomography, Luy river. &lt;sup&gt;&amp;#160;&lt;/sup&gt;&lt;/p&gt;&lt;p&gt;*Corresponding Authors. Email: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]&lt;/p&gt;

scholarly journals Electrical Resistivity Tomography for Mapping Groundwater Resources in Different Environ

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
S.N. Rai
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Groundwater Resources ◽  
Ground Surface ◽  
Geothermal Resources ◽  
Resistivity Tomography ◽  
Related Case ◽  
Mining Areas ◽  
Survey Techniques ◽  
Geological Formations

A major share of water supply to meet the ever increasing demands for domestic, industrial and irrigation usages is derived from groundwater resources which are distributed over the entire globe. These resources are invisible from ground surface. The need for their delineation with high precision has led to the continuous advancement in the geophysical survey techniques and interpretation theory. Electrical resistivity tomography (ERT) is an outcome of such advancement in the conventional electrical resistivity methods used for exploration of this sub-surface natural resource on the basis of distinctive reduction in the electrical resistivity value of groundwater bearing geological formations/structure in comparison to their host environs devoid of water. Objective of this paper is to present an overview of the application of ERTin delineation of groundwater resources in complex geological setup of problematic areas, sources of geothermal water, and delineation of groundwater pockets in mining areas in order to prevent natural disasters such as landslide in open cast mines with the help of related case studies. This kind of knowledge about the occurrence of groundwater/geothermal resources is essential to achieve the preset objectives of their management.

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