groundwater quality Articles
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Self-organizing map clustering technique for ANN-based spatiotemporal modeling of groundwater quality parameters
The present study integrates co-kriging as spatial estimator and self-organizing map (SOM) as clustering technique to identify spatially homogeneous clusters of groundwater quality data and to choose the most effective input data for feed-forward neural network (FFNN) model to simulate electrical conductivity (EC) and total dissolved solids (TDS) of groundwater. The methodology is presented ...
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Groundwater quality modeling using neuro-particle swarm optimization and neuro-differential evolution techniques
Recently, the capabilities of artificial neural networks (ANNs) in simulating dynamic systems have been proven. However, the common training algorithms of ANNs (e.g., back-propagation and gradient algorithms) are featured with specific drawbacks in terms of slow convergence and probable entrapment in local minima. Alternatively, novel training techniques, e.g., particle swarm optimization ...
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Application of a GIS-based DRASTIC model and groundwater quality index method for evaluation of groundwater vulnerability: a case study, Sefid-Dasht
Pollution control and removal of pollutants from groundwater are a challenging and expensive task. The aims of this paper are to determine the aquifer vulnerability of Sefid-Dasht, in Chaharmahal and Bakhtiari province, Iran, using the DRASTIC model. In addition, the groundwater quality index (GQI) technique was applied to assess the groundwater quality and study the spatial variability of ...
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Optimal groundwater contamination monitoring using pumping wells
This study presents a new method for selecting monitoring wells for optimal evaluation of groundwater quality. The basic approach of this work is motivated by difficulties in interpolating groundwater quality from information collected for only few sampled wells. The well selection relies on other existing data relevant to contaminant distribution in the sampling domain, e.g. predictions of ...
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Simulation of seawater intrusion in the Nile Delta aquifer under the conditions of climate change
The problem of seawater intrusion is encountered in almost all coastal aquifers. Because of its higher density, the seawater migrates inland into freshwater aquifers even without any pumping activities. Excessive pumping of groundwater would accelerate seawater intrusion. Climate change and sea level rise represent critical parameters affecting the rate and degree of seawater intrusion. In ...
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Aquifer storage recovery efficiency for saline groundwater regions as influenced by buffer storage volume and storage time
Abstract: Field experiments were carried out in a cavity type of Aquifer Storage Recovery well installed in an aquifer having highly saline native groundwater (EC = 28.4 dS m-1). Good quality canal water (EC = 0.46 dS m-1) was injected to investigate the effect of buffer storage volume (varying from 2000 –14000 m3) and storage time (varying from 2.5–70 ...
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Determination of Groundwater Quality Index of a Highland Village of Kerala (India) Using Geographical Information System
In this study, the authors’ goal was to understand the groundwater quality of Nedumkandam panchayat by an integrated approach of traditional water quality analysis and Geographical Information Systems (GIS). Fourteen wells were identified from the study area and samples were collected and analyzed using standard protocols (American Public Health Association, 1998). Parameters analyzed include pH, ...
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Quantitative Assessment of Regional Rock Aquifers, South-Western Quebec, Canada
The population of the St. Lawrence Lowlands platform in south-western Quebec, Canada, is heavily dependent on groundwater. The present study summarizes the quantity, quality and sustainability estimations of the groundwater resources found mainly in sedimentary rock aquifers. Results show that the regional groundwater flow in the considered domain of 1,500 km2 is 97.7 Mm3/y with: 86.6% ...
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Numerical modelling of the environmental impact of landfill leachate leakage on groundwater quality – a field application
Waste disposal facilities are mainly responsible for the gradual quality degradation of subsurface freshwater reservoirs. The main objective of this work is to identify the groundwater contamination risk due to potential leachate leakage and seepage beneath the municipal landfill of the City of Patras in Greece. A groundwater and leachate mass transport model of the underlying aquifer was ...
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Development of a coupled flow and solute transport modelling for Astaneh–Kouchesfahan groundwater resources, North of Iran
Astaneh–Kouchesfahan Plain is an important source of groundwater in Northern Iran. In the study area, rational management of groundwater resources requires a precise evaluation of groundwater flow and transport components. For this purpose, a 2–dimentional groundwater flow and solute transport model was developed and calibrated using PMWIN 5.3. Simulation results under ...
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Stochastic hydro-economic model for groundwater quality management using Bayesian networks
A strong normative development in Europe, including the Nitrate Directive (1991) and the Water Framework Directive (WFD) (2000), has been promulgated. The WFD states that all water bodies have to reach a good quantitative and chemical status by 2015. It is necessary to consider different objectives, often in conflict, for tackling a suitable assessment of the impacts generated by water policies ...
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Application of first-order reliability method to modelling the fate and transport of benzene in groundwater
Parameter uncertainty plays a significant role in decision making regarding groundwater contamination and remediation, especially for non-conservative chemicals. This paper presents a probabilistic screening model to accommodate parameter uncertainty in the aquifer media, and physical–chemical parameters, using the first-order reliability method (FORM). The application of the developed model is ...
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Considerations for the mitigation of nitrate contamination: stable isotopes and insights into the importance of soil processes
Nutrient management is widely promoted to minimize the impact of intensive fertilizer use on groundwater quality, however watershed-scale stable isotope studies in eastern North America suggest nitrogen transport to groundwater is dominated by non-growing season fluxes derived principally from the mineralization and nitrification of soil organic matter. In the current field scale study, δ15N ...
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Research on the process-based risk evaluation method of groundwater pollution for contaminated site
A universal method to evaluate groundwater pollution risk with the site scale has not been established. The groundwater pollution risk is commonly evaluated by overlaying the results of groundwater vulnerability and pollution sources, but this method is inapplicable for contaminated sites. Considering the current supervision demands of groundwater pollution in China, this paper suggests a ...
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Environmental impacts of aquifer thermal energy storage investigated by field and laboratory experiments
Aquifer thermal energy storage (ATES) uses groundwater to store energy for heating or cooling purposes in the built environment. This paper presents field and laboratory results aiming to elucidate the effects that ATES operation may have on chemical groundwater quality. Field data from an ATES site in the south of the Netherlands show that ATES results in chemical quality perturbations due to ...
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Modelling nitrate pollution of groundwater using artificial neural network and genetic algorithm in an arid zone
This paper presents a hybrid approach to analyse nitrate pollution based on an Artificial Neural Network (ANN) and Genetic Algorithm (GA). This makes it possible to compute the amount of nitrate in different time-scales easily without employment of confusing complicated mathematical equations. Generally, the results of the current research could be useful in management purposes and also for ...
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Bioremediation Removes Environmental Stigma for Resort
Untitled Document Although environmental contamination is far from our minds when we think of Florida resort properties, leaking underground storage tanks can contaminate soil and groundwater, and prevent property financing and redevelopment. Microbial bioremediation has recently been used at two Florida resorts to restore the propertys environmental ...
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In-Situ Anaerobic Remediation of Perchlorate-Impacted Soils
AbstractARCADIS is currently leading the development, evaluation, and selection of a final groundwater remedy for a 94-acre manufacturing facility in the western U.S. This facility has produced small explosives and vehicular safety products since 1957. As a result of historic operations, soil and groundwater at the site have been impacted by perchlorate. To date, remediation efforts have been ...
By Arcadis
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Potential impacts of climate change on groundwater resources – a global review
Groundwater is a vital resource for sustaining life. Changes in the Earth's climate have the potential to affect both the quality and quantity of available groundwater, primarily through impacts on recharge, evapotranspiration and (indirectly) on pumpage and abstraction. Groundwater is a major contributor to streamflow in areas with relatively shallow water tables, so changes in groundwater ...
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Drinking Water Resource Protection, Germany
Reference Project: Drinking Water Resource Protection, Germany In the catchment area of a major drinking water supplier in western Germany increasing nitrate concentrations were noticed within a deep water-bearing layer. Although high nitrate concentrations, resulting from regional intensive application of fertilizers, were known from shallow layers in the area, they were new to the deep ...
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