flow modeling Articles
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Impact of pumping in open pit mining on groundwater flow: a case study
The groundwater flow behaviour was analysed during pre-monsoon, monsoon, and post-monsoon seasons. At first, the groundwater model was analysed in the steady state, and then the same was applied in the transient state to predict the spatio-temporal behaviour of groundwater in the region. Transient flow model was also developed to estimate the potential impact of pumping of groundwater due to ...
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The combined use of MODFLOW and precipitation-runoff modeling to simulate groundwater flow in a diffuse-pollution prone watershed
A numerical modeling case study of groundwater flow in a diffuse pollution prone area is presented. The study area is located within the metropolitan borders of the city of Izmir, Turkey. This groundwater flow model was unconventional in the application since the groundwater recharge parameter in the model was estimated using a lumped, transient water-budget based precipitation-runoff model that ...
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Study of groundwater using visual MODFLOW in the Manas River Basin, China
For effective groundwater management of a basin, it is essential that a careful water balance study be carried out. A three-dimensional transient-state finite difference groundwater flow model is used to quantify the groundwater fluxes and analyze the dynamic changes of groundwater level. After monitoring groundwater levels for 43 typical observation wells through a simulation study of the ...
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Assessing the extent of induced leakage to an urban aquifer using environmental tracers: an example from Bishkek, capital of Kyrgyzstan, Central Asia
A groundwater residence time study of the deep fluvioglacial aquifer supplying Bishkek, capital of Kyrgyzstan, has found evidence of deep infiltration of recent recharge both in the main periurban wellfield and below the city. Commonly-employed hydrochemical markers detected urban influence in the city-centre to depths of 65–100 m, but gave no indication of the important role of induced ...
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Groundwater flow modeling to support water management scenarios – the Bekaa Valley, Lebanon
The Italian Ministry of Foreign Affairs funded a project aimed at developing tools for water management in the Bekaa valley, Lebanon. The Lebanese Ministry of Energy and Water implemented the project, supported by the University of Milan Department of Agricultural and Environmental Sciences (DISAA). The geologic framework consists of a cretacean-eocean carbonatic structure, crossed by a fracture ...
By Tethys srl
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Project - Wellhead Protection Area Delineation and Vulnerability Scoring for the Brantford Airport Wellfield
Client: Grand River Conservation Authority (GRCA): 400 Clyde, Cambridge, ON Contact: Sonja Strynatka, P.Geo, Senior Hydrogeologist Key Personnel: Michael Takeda, Spencer Malott, E.J. Wexler The Brantford Airport wellfield, located 6 kilometers west of the Brantford town centre, services a small population of residential and industrial water users. A single well (Airport Well 1) ...
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An investigation on the effect of geometric shape of streams on stream/ground water interactions and ground water flow
Ground water should be used efficiently and improved for sustainable water management plans. For this purpose, comprehensive ground water flow models are developed incorporating surface/ground water interactions. Typically, these models require a significant amount of hydrological parameters and the sensitivities of these parameters on interaction mechanisms need to be clarified. Therefore, in ...
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Screening level modeling of long-term impact of petroleum hydrocarbon contamination on fresh groundwater lenses in the Arabian Gulf region
The Gulf War in 1991 created an environmental catastrophe, one of the major consequences of which was setting several oil wells on fire in the Arabian Gulf area. The total oil spilled as a result of the damaged wells was about 3.5 × 106 m3. Out of these, 3.3 × 106 m3 of oil was recovered and exported. The rest was left behind as it was not economical to collect. The oil left behind was subject to ...
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Micro level groundwater flow and transport model to predict future spread of pollution for Ambur sub–basin, Tamil Nadu, India
Realistic groundwater flow and transport models have greater use in understanding, predicting and managing groundwater systems in water–scarce and polluted areas. In this study, micro–level flow and transport models were developed, using the Visual MODFLOW software, for the highly polluted Ambur sub–basin, Tamil Nadu for the purpose of predicting pollution migration in the next 50 years and ...
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A mixed-integer non-linear programming with surrogate model for optimal remediation design of NAPLs contaminated aquifer
A mixed-integer non-linear programming (MINLP) with surrogate model was introduced to derive the optimal surfactant enhanced aquifer remediation (SEAR) process (remediation cost minimisation and removal rate maximisation) at a nitrobenzene-contaminated site. First, a 3D multi-phase flow simulation model was developed to simulate the SEAR process; using a radial basis function artificial neural ...
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Semi-analytical 3D solution for assessing radial collector well pumping impacts on groundwater–surface water interaction
We present a new semi-analytical flow and transport model for the simulation of 3D steady-state flow and particle movement between groundwater, a surface water body and a radial collector well in geometrically complex unconfined aquifers. This precise and grid-free Series Solution-analytic element method approach handles the irregular configurations of radial wells more efficiently than ...
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Modeling Leachate Contamination and Remediation of Groundwater at a Landfill Site
Leachate contamination of an aquifer from a landfill sitewas simulated using the groundwater flow and transport model SUTRA developed by the U.S. Geological Survey. The model calibration was performed by spatially adjusting the hydraulic conductivity in order to capture the measured hydraulic head spatial variation and then by adjusting the dispersivity and porosity match the measured chloride ...
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Development of two-dimensional groundwater flow simulation model using meshless method based on MLS approximation function in unconfined aquifer in transient state
In recent decades, due to reduction in precipitation, groundwater resource management has become one of the most important issues considered to prevent loss of water. Many solutions are concerned with the investigation of groundwater flow behavior. In this regard, development of meshless methods for solving the groundwater flow system equations in both complex and simple aquifers' geometry ...
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USGS surveys, models high plains groundwater resources
A United States Geological Survey publication and model of groundwater resources in the Northern High Plains aquifer can be used to better understand the region’s water resources, a critical component of scientific water management. This type of comprehensive study has not been made in more than 30 years The models can be used to assess the flow, quantity, sources, and sinks of groundwater ...
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A systematic approach for evaluation of capture zones at pump and treat systems
This document describes a systematic approach for performing capture zone analysis associated with ground-water pump and treat (P&T) systems. A “Capture Zone” refers to the three-dimensional region that contributes the ground water extracted by one or more wells or drains (see Figure 1). A capture zone in this context is equivalent to the “zone of hydraulic containment”. If a contaminant ...
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Hydraulic and Thermal Response of Groundwater–Surface Water Exchange to Flooding in Experimental Aquifer
Summary The effects of flooding on interactions between streams and shallow aquifers are poorly studied due to the unpredictable nature of flooding events. This study examines groundwater-surface water interactions in a constructed experimental meander over several simulated flood events using hydrologic and thermal monitoring. Detailed steady-state hydraulic head measurements were taken of the ...
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Evaluation of a Horizontal Well
Background: Air Sparging Air sparging is an in-situ remediation technology where air is injected into the saturated zone of an aquifer. It is an alternative to conventional ex-situ pump and treat systems for remediation of contaminated ground water. It is necessary to understand the pattern of air flow that will occur in the subsurface in order to determine the optimal placement, number, and ...
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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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Estimating contaminant-flushing rates for heterogeneous aquifers
Groundwater remediation evaluations typically include cleanup time projections. Current batch flushing-rate equations and analytical models often used to estimate groundwater cleanup rates typically underestimate cleanup times, with a major factor the flawed assumption of aquifer homogeneity. Numerical modelling of groundwater flow and contaminant transport is a time-intensive and costly ...
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The Influence of an Integrated Remedial System on Groundwater Hydrology
ABSTRACT This paper summarizes the development of a remedial system designed to hydraulically contain and ultimately reduce a plume consisting of primarily 1,1,2,2-tetrachloroethane (1,1,2,2-TeCA). The system consists of groundwater circulating wells or extraction wells located in the core of the 1,1,2,2-TeCA plume to provide active source control, combined with monitored natural attenuation ...
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