scholarly journals Cross-Section Resistivity Detection of Tree (Swietenia Magahoni and Gmelina) Using ERT Method

2022 ◽  
Vol 8 (1) ◽  
pp. 39-44
Author(s):  
Evi Fazriati ◽  
Asep Purnama ◽  
Gian Agistian Algifari ◽  
Irene Siti Amilah Muslimah ◽  
Fitria Hapsari Puteri Sumanto ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Cross Section ◽  
Electrical Resistivity Tomography ◽  
Nondestructive Method ◽  
Resistivity Tomography ◽  
Living Tree ◽  
Value Range ◽  
2D Resistivity ◽  
Swietenia Mahagoni ◽  
Monitoring Activity

The existence of trees is very beneficial for humans’ life. There are utilizations of tree such as urban planning and reforestation. However, the tree can be dangerous when the tree is aged and decay because of several factors that might be cause fallen tree. Furthermore, the monitoring activity is needed to know the condition of the tree. One of the methods that can be used to detect hollow in living tree is Electrical Resistivity Tomography (ERT). The ERT is an efficient and nondestructive method that can be potential to estimate resistivity cross section. The measurement of ERT conducted on Swietenia mahagoni and Gmelina with unhealthy and healthy condition visually. The data processed using Res2Dinv and reconstructed for obtaining 2D resistivity cross section. The results shows that the unhealthy Swietenia mahagoni has logarithmic resistivity value range between 0.1-1 Ωm and the healthy Swietenia mahagoni has 1-4 Ωm. Meanwhile, the unhealthy and healthy Gmelina has logarithmic resistivity value range between 0.5-4.5 Ωm and 0.5-3 Ωm, respectively. It is shows that the tree indicated health visually from biological view does not mean the tree is decay. It might be influenced by phenology factor and/or the species of the tree.

scholarly journals Electrical resistivity tomography applied to geologic, hydrogeologic, and engineering investigations at a former waste-disposal site

Geophysics ◽  
2006 ◽  
Vol 71 (6) ◽  
pp. B231-B239 ◽  
Author(s):  
Jonathan E. Chambers ◽  
Oliver Kuras ◽  
Philip I. Meldrum ◽  
Richard D. Ogilvy ◽  
Jonathan Hollands
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Site Investigation ◽  
High Resistivity ◽  
Potential Zone ◽  
Resistivity Tomography ◽  
L2 Norm ◽  
Resistivity Model ◽  
2D And 3D ◽  
2D Resistivity

A former dolerite quarry and landfill site was investigated using 2D and 3D electrical resistivity tomography (ERT), with the aims of determining buried quarry geometry, mapping bedrock contamination arising from the landfill, and characterizing site geology. Resistivity data were collected from a network of intersecting survey lines using a Wenner-based array configuration. Inversion of the data was carried out using 2D and 3D regularized least-squares optimization methods with robust (L1-norm) model constraints. For this site, where high resistivity contrasts were present, robust model constraints produced a more accurate recovery of subsurface structures when compared to the use of smooth (L2-norm) constraints. Integrated 3D spatial analysis of the ERT and conventional site investigation data proved in this case a highly effective means of characterizing the landfill and its environs. The 3D resistivity model was successfully used to confirm the position of the landfill boundaries, which appeared as electrically well-defined features that corresponded extremely closely to both historic maps and intrusive site investigation data. A potential zone of leachate migration from the landfill was identified from the electrical models; the location of this zone was consistent with the predicted direction of groundwater flow across the site. Unquarried areas of a dolerite sill were imaged as a resistive sheet-like feature, while the fault zone appeared in the 2D resistivity model as a dipping structure defined by contrasting bedrock resistivities.

scholarly journals Electrical resistivity tomography for aquifer imaging

2000 ◽  
Vol 22 ◽  
Author(s):  
Dipak Raj Pant
Keyword(s):  
Electrical Resistivity ◽  
Cross Section ◽  
Electrical Resistance ◽  
Apparent Resistivity ◽  
Electrical Resistivity Tomography ◽  
Field Experiments ◽  
Region Of Interest ◽  
Electrical Energy ◽  
Resistivity Tomography ◽  
Computerised Analysis

Aspects related to the development of a technique called electrical resistance tomography for producing two- or three­ dimensional subsurface images of an aquifer have been discussed. The technique is based on the automated measurement and computerised analysis of electrical resistivity changes caused by natural or man-made processes. A subsurface region of the aquifer to be studied is sampled by transmitting electrical energy through it along many paths of known orientations, and the apparent resistivity data derived are used to construct a cross-section al image of the region of interest. The physical model experiments and field experiments show that the presented method is effective and flexible for crosshole resistivity imaging of aquifer with bipole-bipole electrode configurations.

scholarly journals Electrical Resistivity Tomography And Induced Polarization Study For Groundwater Exploration In The Agricultural Development Areas of Brunei Darussalam

2021 ◽  
Author(s):  
Lieyana Azffri ◽  
Stefan Herwig Gödeke ◽  
Mohammad Faizan Ibrahim
Keyword(s):  
Electrical Resistivity ◽  
Agricultural Development ◽  
Electrical Resistivity Tomography ◽  
Groundwater Exploration ◽  
Induced Polarization ◽  
Resistivity Tomography ◽  
Well Drilling ◽  
Brunei Darussalam ◽  
Groundwater Yield ◽  
2D Resistivity

Abstract Electrical Resistivity Tomography (ERT) and Induced Polarization (IP) study was carried out for groundwater exploration at eight agricultural development areas in Brunei Darussalam. The study was undertaken to meet the growing demands of water supply in the Brunei agricultural sector, particularly for paddy field irrigation. A total of nineteen survey lines with survey lengths of up to 800 m and investigation depths of up to 150 m below ground level were conducted to delineate subsurface geological structures, formations and aquifer zones in the study area. Aquifer zones with resistivity values ranging from 1 to 100 ohm-m and chargeability values of less than 1 mV/V were detected in all surveyed locations. New groundwater well drilling was conducted at two of the surveyed sites based on interpretations of 2D resistivity and chargeability inversion models. Water well drilling encountered aquifer zones, which were primarily in sandy layers. Hydraulic tests revealed groundwater yields of 4.3 and 288 m³/day. Estimated transmissivity values of the aquifer units based on pumping tests are 0.53 and 109 m²/day, while their hydraulic conductivity values are 0.05 and 2.75 m/day. Estimated parameters of the aquifer units indicate weak to moderate groundwater yield for withdrawal and distribution for irrigation purposes at the investigated sites. The present study helped decision-makers take suitable measures for placing future irrigation wells and achieve significant groundwater exploration results in the study area.

scholarly journals Struktur Resistivitas Dangkal Sebagai Upaya Mitigasi Bencana Pergerakan Tanah

2019 ◽  
Vol 5 (1) ◽  
pp. 108
Author(s):  
Bambang Wijatmoko ◽  
Budy Santoso ◽  
Eleonora Agustine ◽  
Yudi Rosandi
Keyword(s):  
Electrical Resistivity ◽  
Cross Section ◽  
Carrying Capacity ◽  
Electrical Resistivity Tomography ◽  
Disaster Mitigation ◽  
Inversion Method ◽  
High Demand ◽  
Resistivity Tomography ◽  
2D Inversion ◽  
Settlement Site

Cisempur village is located at the slope of Mount Geulis, having a very variated morphology from gentle slopes to very steep ones. Due to the high demand for settlements the land use change can not be avoided.  The steepness of the slope, the decrease of the number of vegetations, and the increase of load from buildings may induced land slide occurrence.  This problem motivate us to perform measurement at the area, in order to uncover the information about the level of stability and the land carrying capacity, through the study of the subsurface rock layering condition. In this work, we present the shallow resistivity by means of Electrical Resistivity Tomography (ERT) method in two measurement lines. The obtained data is processed using 2D inversion method, in order to obtain the layering structure cross-section. The interpretation of the results suggest the existence of sandstone, which is normally associated with the location of aquifer and tuffaceous clay. The tuffaceous may function as the slide plane in the land slide event. The interpretation also shows that the carrying capacity decrease very extremely at the settlement site, which is indicated by the land displacement. This information has to be socialized and transferred to the inhabitant, in order to build awareness, and the land slide disaster mitigation can be carried out.

scholarly journals 3D and Boundary Effects on 2D Electrical Resistivity Tomography

2019 ◽  
Vol 9 (15) ◽  
pp. 2963 ◽  
Author(s):  
Yin-Chun Hung ◽  
Chih-Ping Lin ◽  
Chin-Tan Lee ◽  
Ko-Wei Weng
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Geophysical Methods ◽  
Boundary Effects ◽  
Electrode Spacing ◽  
Resistivity Tomography ◽  
Buried Objects ◽  
Survey Line ◽  
Parametric Studies ◽  
2D Resistivity

Electrical resistivity tomography (ERT) is one of the most widely used geophysical methods in geological, hydrogeological, and geo-environmental investigations. Although 3D ERT is now available, 2D ERT remains state-of-the-practice due to its simplicity in fieldwork and lower space requirements. 2D ERT assumes that the ground condition is perpendicular to the survey line and outside the survey line is homogeneous. This assumption can often be violated in conditions such as geologic strikes not perpendicular to the survey line and topographic changes or buried objects near the survey line. Possible errors or artifacts in the 2D resistivity tomogram arising from violating the 2D assumption are often overlooked. This study aimed to numerically investigate the boundary effects on 2D ERT under various simplified conditions. Potential factors including resistivity contrast, depth and size of buried objects, and electrode spacing were considered for the parametric studies. The results revealed that offline geologic features may project onto the 2D tomogram to some extent, depending on the aforementioned factors. The mechanism and implications of boundary effects can be drawn from these parametric studies.

Assessment of Chromium Waste Contamination by Electrical Resistivity Tomography: A Case Study

2019 ◽  
Vol 24 (1) ◽  
pp. 163-167
Author(s):  
Yuling Wang ◽  
Ya Xu ◽  
Changxin Nai ◽  
Lu Dong
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Soil Analysis ◽  
Soil Samples ◽  
Production Plant ◽  
Resistivity Tomography ◽  
Groundwater Sampling ◽  
Resistivity Model ◽  
Main Production ◽  
2D Resistivity

This study aims to determine the chromium contamination at an abandoned chemical factory by electrical resistivity tomography (ERT). Five ERT survey lines were conducted in the main production plant and two boreholes were drilled to collect soil samples for soil analysis. The 2D and 3D resistivity model were constructed to evaluate the pollution plumes. The ERT results showed that seven low-resistivity zones are observed in the 2D resistivity profiles, which may indicate the main pollution areas at the site. The 3D electrical resistivity model further showed that the soil pollution is more severe in the southwest than in the other areas of the site. The ERT results were partly verified by chemical analysis of soil samples. These ERT results can be further used for additional designs of soil and groundwater sampling.

scholarly journals Earthflow reactivation assessment by multichannel analysis of surface waves and electrical resistivity tomography: A case study

2021 ◽  
Vol 13 (1) ◽  
pp. 1328-1344
Author(s):  
Amr Abd El-Raouf ◽  
Ibrar Iqbal ◽  
Julia Meister ◽  
Kamal Abdelrahman ◽  
Hassan Alzahrani ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Surface Waves ◽  
Electrical Resistivity Tomography ◽  
Three Dimensional ◽  
Integrated Approach ◽  
Resistivity Tomography ◽  
Clay Deposits ◽  
Stable Slope ◽  
Multichannel Analysis ◽  
2D Resistivity

Abstract In this study, we investigated the stability and reactivation of preexisting Tonghua landslide deposits in China, including the adjacent stable slope. We used an integrated approach, combining a multichannel analysis of surface waves (MASW) and electrical resistivity tomography (ERT). We used ERT to determine groundwater seepage paths, weathering conditions, water content, and the depth to bedrock. High-resolution two-dimensional (2D) shear-wave velocity MASW images, on the other hand, played an essential role in detecting both horizontal and vertical compositions, disjointedness, and sliding surfaces related to lithological borders. Based on seismic models, we considered four geological layers encountered in the stable slope, including fractured (gravel) and weathered (phyllite) materials, as a sliding mass. We combined the 2D resistivity profiles obtained to create pseudo-three-dimensional ERT images to estimate water-saturated and unsaturated masses. From the tomography results, we identified different preexisting deposits, including buried arable clay deposits, old accumulated earthflow deposits, a water accumulation zone, and a fissure runoff. Based on the resistivity results, the bottom of the earthflow deposits is susceptible to water, and oversaturation can reactivate the earthflow.

scholarly journals Evaluation of petroleum hydrocarbons contamination in soils and groundwater using electrical resistivity and hydrochemical methods-Case study: Ayetoro, Osogbo southwestern Nigeria

2021 ◽  
Vol 47 (2) ◽  
pp. 597-608
Author(s):  
Mutiu A Fakunle ◽  
Muhydeen A Ibraheem ◽  
Wasiu B Agbaje ◽  
Luqman A Abidoye
Keyword(s):  
Electrical Resistivity ◽  
Petroleum Hydrocarbons ◽  
Electrical Resistivity Tomography ◽  
Silty Clay ◽  
Southwestern Nigeria ◽  
Resistivity Tomography ◽  
Porosity And Permeability ◽  
Dug Wells ◽  
2D Resistivity ◽  
Dug Well

The presence of Petroleum Hydrocarbons (PHCs) in hand-dug wells has become a concern to the residents of Ayetoro area, Osogbo. Consequently, the detection of PHCs was evaluated using, nine Vertical Electrical Soundings (VES) and 2D electrical resistivity tomography surveys. Soil samples collected were analyzed for porosity and permeability. Hand-dug well water samples were screened for PHCs. VES revealed that second layer had high apparent resistivity of 14415.0 Ωm, indicating presence of PHCs that had penetrated to maximum depth of 19.1 m. The highest resistivity of the control points was 48.0 Ωm, indicating absence of PHCs. The 2D resistivity revealed highest value of 3622 Ωm and had migrated to a depth of 10.0 m. The porosity (0.40) and permeability (6.87516 x 10–4 cm/s) were typical of silty clay which allowed passage of PHCs. Hydro-chemical analysis indicated presence of PHCs (0.50–11.00 mg/L). The study has established presence of PHCs in soils and hand-dug wells. Keywords: Petroleum Hydrocarbons, Soil, Groundwater, Electrical resistivity tomography

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