groundwater investigation Articles
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Next generation of magnetic resonance tools
Readers of Preview who work with groundwater may be interested in two next generation Magnetic Resonance (MR) tools. These are Vista Clara products, so, in the spirit of full disclosure, I should say that I have been working as Vista Clara’s sales and equipment representative in Australia since 2017. Vista Clara is a US-based company exclusively focussed on MR instrumentation for ...
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Three-phase approach to improve deep groundwater supply availability in the Elidar district of Afar region of Ethiopia
This study provides new evidence on the effectiveness of a combined remote sensing and hydrogeological investigation method for deep groundwater development in complex geologic and geomorphologic situations in Ethiopia. The study was undertaken in the Elidar district of the Afar region of Northern Ethiopia. Due to the water availability and vegetation in this district, the majority of the ...
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Wavelet and neuro-fuzzy conjunction model for predicting water table depth fluctuations
The ability of a wavelet and neuro-fuzzy conjunction technique for groundwater depth forecasting was investigated in this study. The wavelet-neuro-fuzzy model was improved by combining two methods, the discrete wavelet transform and the neuro-fuzzy model. The conjunction model was applied to different input combinations of daily groundwater depth data of Bondville and Perry wells. Root mean ...
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Multi-electrode resistivity survey for groundwater exploration in the Harare greenstone belt, Zimbabwe
A multi-electrode resistivity survey, carried out over metasedimentary strata and metavolcanics in the Harare greenstone belt in northeastern Zimbabwe as part of a groundwater resources investigation, illustrates the ability of this technique to produce high-resolution images of the subsurface, which are useful for groundwater resources assessment. The resistivity results provide a clear view of ...
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Westbay System Delivers Cost-Effective Groundwater Monitoring in Mountainous Region - Case study
CHALLENGE After installing a number of traditional monitoring wells at the site, it became clear to the project scientists that more and better data would be necessary to properly characterize the complex groundwater flow system. SOLUTION The high cost (measured in both time and money) of installing conventional well clusters at high-elevation locations caused DCRG to consider other options. ...
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Chemical composition of groundwaters in the Hornsund region, southern Spitsbergen
Chemical composition of groundwaters was investigated in the region of the Hornsund fjord (southern Spitsbergen). The investigations were conducted during polar expeditions organized by the University of Wroclaw in two summer seasons of 2003 and 2006. Three zones of groundwater circulation: suprapermafrost, intrapermafrost and subpermafrost, were identified in areas of perennial permafrost in ...
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FastTIMES article: Surface and Borehole NMR as a Characterization Tool for Managed Aquifer Recharge
Nuclear Magnetic Resonance (NMR) is a powerful technology for groundwater investigations, leveraging the same physics as medical MRI imaging to directly detect water and characterize subsurface hydrogeologic parameters. In geophysics, surface NMR methods can be used to non-invasively map groundwater aquifers and borehole logging NMR tools can be used to obtain high-resolution estimates of ...
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Application of Rn-222 isotope for the interaction between surface water and groundwater in the Source Area of the Yellow River
A pioneering rapid and direct measurement of dissolved 222Rn in the field has been used here to explore interaction between surface and groundwater in the source area of the Yellow River (SAYR). The results indicate average 222Rn activity of 2,371 Bq/m3 in surface water and 27,835 Bq/m3 in groundwater. The high 222Rn activity (up to 9,133 Bq/m3) found in the southeast part of the SAYR ...
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Removal of trichloroethylene in groundwater with two oxidants: siderite catalyzed hydrogen peroxide and sodium persulfate
Trichloroethylene (TCE), a widely used solvent, is often determined in groundwater and is one of biologically refractory organic contaminants. The aim of the study is to use a new chemical oxidation method to degrade TCE source pollution in groundwater. Fenton-like reactions (hydrogen peroxide catalyzed by iron minerals generates hydroxyl radicals) and sodium persulfate activation (sodium ...
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Benefits of Magnetic Resonance (NMR) compared to Electrical Resistivity in Brackish and Saline Groundwater Investigations
Geophysical NMR measurements deliver reliable and straightforward hydrogeologic information, even in saline groundwater environments. These environments can be challenging to characterize with conventional electrical resistivity measurements, because differences in resistivity may be associated with the fluid or with the formation. Low resistivity could be correlated with a impermeable clay, or ...
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Environmental Liability Management for a Large American University
Challenge A large American university recently acquired a two-hundred acre hospital property for the purpose of future developments. One fifth of the property was impacted by chlorinated solvents and petroleum. Antea Group was appointed to assume the liability, return the land to residential use, and abate the migration of contaminants with minimal disruption to the campus or the hospital. ...
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Several natural indicators of radial well ageing at the Belgrade Groundwater Source, part 2
From 2005 to 2009, research was conducted at the Belgrade Groundwater Source (BGWS) to investigate the process of clogging of wells with horizontal lateral screens (radial wells). The clogging process was monitored via the kinetics of the increase in hydraulic losses at the laterals. A correlation of this process with the redox potential, the iron concentration in water, and the microbial ...
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Pollution retention capabilities of roadside soils
ABSTRACTRunoff from highways contains significant loads of heavy metals and hydrocarbons. According to German regulations, it should be infiltrated over embankments to support groundwater-recharge. To investigate the decontaminating effect of greened embankments, soil-monoliths from highways with high traffic densities were taken. Soils were analyzed to characterize the contamination in relation ...
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Nutrient mobilisation and losses related to the groundwater level in low peat soils
The changes in dissolved organic carbon (DOC), N-NO3, N-NH4 and P-PO4 concentrations in response to fluctuations in the groundwater table were investigated in the peatlands of Biebrza National Park and some of its surrounding sites. The lowering of the groundwater table during summer time was accompanied by an increase in P-PO4 and N-NH4 concentrations, and in some cases they were exceptionally ...
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Electrolytic denitrification with an ion-exchange membrane in groundwater
Nitrate contamination of groundwater is an important issue in rural areas. In this study, an electrolytic method for the denitrification of groundwater was investigated in a laboratory reactor. We used an ion-exchange membrane, employing a titanium oxide anode and five kinds of cathode for the investigation. The nitrate removal efficiencies with Cu, Pb, Ti/Ir/Ru, Ti/Ir/Ta, and Zn cathodes ...
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Advantages of NMR vs ERT for Characterizing Aquifers in Highly Saline Environments
One of the more challenging situations in geophysics is the need to identify and characterize aquifers in highly saline environments. Saline environments are inherently conductive, which means conventional Electrical Resistivity Tomography (ERT) techniques are less effective because the ERT signals don’t penetrate very far into highly conductive ground and the contrasts between water and ...
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Shallow groundwater surrounding the Likeng landfill, Guangzhou, China – major ions and elements indicating the contamination sources
An investigation of groundwater contamination around the Likeng landfill, Guangzhou, was carried out. Major ions and elements of 34 groundwater samples were measured, and the Piper trilinear diagram and expanded Durov diagram were used to analyze the chemical types and hydro-geochemical processes of the groundwater. End Member Mixing Analysis was used to find the types and sources of ...
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Solid waste characterisation and the assessment of the effect of dumping site leachate on groundwater quality: a case study
In this study, the characterisation of the solid waste and the effect of the leachate from the major dumping site in Perungudi, Chennai city, on groundwater is investigated. Various physical and chemical parameters were estimated: this includes pH, total hardness, electrical conductivity, and total dissolved solids, major cations such as Ca2+, Mg2+, Na+, and K+, major anions such as NO32−, Cl−, ...
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Risk assessment of BTEX in the groundwater of Songyuan region of Songhua River in China
BTEX compounds (benzene, toluene, ethylbenzene and xylenes (m-, p-xylene and o-xylene)) in shallow groundwater were investigated in 16 monitoring wells of the Songyuan region (Songhua River basin). Mean concentrations of benzene, toluene, ethylbenzene, and xylenes were found to be 1.53 μg/L, 1.76 μg/L, 2.11 μg/L and 0.30 μg/L, respectively. Ecological and human health risk assessments were ...
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Case Study - Groundwater Monitoring Network Investigation - Okanagan Kootenay Region
Western Water Associates was tasked with analyzing groundwater chemistry data, recommending modifications of monitoring networks, and enhancing the capability of client staff to interpret data and present findings. They selected EnviroInsite as their principal data visualization application and made rich use of its capabilities to present spatial and temporal patterns in water quality ...
By EI LLC
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