aquifer study Articles
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A finite layer technique for calculating three-dimensional pollutant migration in soil
A technique for the analysis of two— and three—dimensional pollutant migration through a layered soil medium is described. An earlier solution for plane diffusion in a single homogeneous layer of soil is extended using the finite layer method for general three-dimensional diffusion. Particular attention is focused on the effects of horizontal advective velocity and coefficient of hydrodynamic ...
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Saltwater Intrusion in Deep Southern California Aquifers - Case Study
Motivation The US Geological Survey and water managers in California required improved understanding of saltwater intrusion in deep, coastal Southern California aquifers. In San Diego, the groundwater managers needed unambiguous, high-resolution information on the hydrologic properties of water-bearing formations beneath San Diego Harbor, to depths of up to 3000 feet, to identify and assess the ...
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A Crystal Clear Solution
Iron oxide residues in groundwater are becoming an increasing problem, estimated to affect about 40% of the world’s water bores, and anecdotal evidence indicates that this number is steadily increasing. Whether caused by naturally occurring bacteria or straight chemical means, these residues will eventually affect nearly everyone who sources water from groundwater aquifers. This case study ...
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Fresh Water Springs in High Salinity Aquifer GeoTrax Survey - Case Study
Bottom Line: GeoTrax Survey was used to locate the source of fresh water springs in the Great Artesian Basin (GAB), South Australia Blue zones shown above represent the interpreted distribution of upwelling of GAB fluids to the spring mounds Green rectangles shown above represent spring dependent surface vegetation Yellow circles represent inferred connections to surface based on GeoTrax ...
By Aestus, LLC
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A GIS-based methodology to delineate aquifer recharge areas
A GIS-based methodology to delineate risk areas for contamination of groundwater resources is presented by identifying recharge conditions to the aquifer. Identifying the recharge areas is based upon surface and subsurface geologic conditions that may control the risk of potential oil spill contaminants into the aquifer. This study uses the Chicot aquifer system in southwest Louisiana as a pilot ...
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Mapping of freshwater aquifers case study
Big Pine Key, Florida The Nature Conservancy is coordinating investigations to document the physical and biological changes that will occur on small oceanic islands as a result of sea level rise. Big Pine Key, FL is one of the primary areas of investigation because of extensive previous work and that a large portion of the island is a National Wildlife Refuge and therefore not subject to future ...
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Impact of over-pumping and sea level rise on seawater intrusion in Gaza aquifer (Palestine)
Seawater intrusion is considered as one of the main processes that degrade water quality by raising salinity to levels exceeding acceptable drinking water standards. Over-abstraction is the main cause of seawater intrusion. Moreover, climate change and sea level rise speed up seawater intrusion. This paper presents the development of a coupled transient finite element model for simulation of ...
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Using CoBupH MG to adjust aquifer pH - Case Study
Problem A US Government site had elevated TCE. Low aquifer pH stalled in situ bioremediation. Project Goal Inject organic substrate in the aquifer to enable naturally-occuring bacteria to effect in situ anaerobic reductive dechlorination Control pH to sustain long-term performance Achieve regulatory remediation levels of 5 µg/L TCE in groundwater and 53 µg/kg TCE in soil ...
By Redox Tech
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Simple methods for quick determination of aquifer parameters using slug tests
The slug test is still one of the simplest and cost-effective methods to interpret the hydraulic parameters for aquifer analysis. This study introduces two new estimation approaches for the slug test, the time shift method (TSM) and arc-length matching method (AMM), to identify aquifer parameters in a reliable and accurate manner, which was established on the idea that any change in the ...
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The variation of stygofauna along a gradient of salinization in a coastal aquifer
We examined the variation of stygofauna composition collected in wells, along a gradient in groundwater salinity/conductivity in a coastal aquifer from southern Portugal. The studied coastal aquifer is considered vulnerable to salinization due to seawater intrusion, caused by overexploitation of the aquifer. Knowing the response of the stygofauna species to present levels of groundwater ...
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Spatial variation in irrigation demand and supply across canal commands in Punjab: a real integrated water resources management challenge
The Indus Basin Irrigation System (IBIS) is more than a century old. Water allowances and canal water distributions responded to increasing crop water requirements in a southward direction, e.g. higher water allowance in Sindh as compared to Punjab. But within a province, the canal water supplies do not address the issue of difference in irrigation demand. The consequence is unprecedented ...
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Assessment of groundwater quality using geographical information system (GIS), at north-east Cairo, Egypt
The present investigation has been conducted to delineate the hydrogeochemical and environmental factors that control the water quality of the groundwater resources in the north-east of Cairo. A complementary approach based on hydrogeochemistry and a geographical information system (GIS) based protectability index has been employed for conducting this work. The results from the chemical ...
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Modeling impacts of climate change and human activities on groundwater resources using MODFLOW
This paper analyzes the impacts of climate change and human pressures on Yazd-Ardakan aquifer using the Hadley Centre Coupled Model, version 3 (HADCM3) circulation Model and A2 emission scenario. Water levels in the study aquifer were simulated using three-dimensional finite-difference groundwater model (MODFLOW 2000) with GMS 8.3 as pre- and postprocessing software. Input for groundwater ...
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NMR Geophysical tools provide critical data for aquifer recharge studies in the Cosumnes River Basin - Case Study
Motivation The Cosumnes River watershed system in Central California is an extremely valuable resource, supplying water for agriculture and domestic needs and provides critical habitat for natural resources. It is one of the few remaining dam-free rivers in the region with a natural salmon run and supports some of the most productive agricultural areas of California. The subbasin has been ...
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Fate of triclocarban during soil aquifer treatment: soil column studies
There are current concerns about the presence of persistent chemicals in recharge water used in soil aquifer treatment systems. Triclocarban (TCC) has been reported as a persistent, high production volume chemical with the potential to bioaccumulate in the environment. It is also known to have adverse effects such as toxicity and suspected endocrine disruption. This study was carried out to study ...
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Arsenic and heavy metals contamination, risk assessment and their source in drinking water of the Mardan District, Khyber Pakhtunkhwa, Pakistan
The present study was conducted to investigate the physico-chemical characteristics in drinking water of Mardan District, Pakistan. Furthermore, water quality was evaluated for the risk assessment of arsenic and heavy metals (HMs) and their contamination sources. Representative groundwater samples of shallow and deep sources were collected in the study area. These samples were analyzed for ...
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Mapping of freshwater aquifers by GeoView case study
Big Pine Key, Florida The Nature Conservancy is studying the physical and biological changes that will occur on small oceanic islands as a result of sea level rise. Big Pine Key, Florida is one of the primary areas of investigation because of extensive previous work on the key and because a large portion of the island is a National Wildlife Refuge. As part of the investigation, GeoView was ...
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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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Arsenic geochemistry in a biostimulated aquifer: An aqueous speciation study
Stimulating microbial growth through the use of acetate injection wells at the former uranium mill site in Rifle, Colorado, USA, has been shown to decrease dissolved uranium (VI) concentrations through bacterial reduction to immobile uranium (IV). Bioreduction also changed the redox chemistry of site groundwater, altering the mobility of several other redox‐sensitive elements present in the ...
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A new no-purge, non-displacement groundwater sampler
What Is It? The HydraSleeve sampler is designed to collect representative water samples from monitoring wells without purging. The disposable sampler collects a discreet sample from only the 'fresh formation' water in the screened interval of the well. It is fast, inexpensive, simple to use, generates no purge water and collects a sample suitable for all analytical parameters. Why It Works The ...
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