groundwater discharge Articles
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Application of thermal remote sensing to delineate groundwater discharge zones
The paper explores whether thermal anomalies at the surface identified by remote sensing allow for the delineation of groundwater discharge zones. The methodology is based on the principle that in shallow groundwater systems, upward fluxes of deep groundwater discharge reduces seasonal temperature variation in layers close to and at the surface. Thermal anomalies were identified by Landsat data ...
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Groundwater discharge downstream of an arid inland river in Northwestern China
Nalenggele River is an inland river located in the arid, fragile ecological environment area in Northwestern China. Groundwater discharge to the river can significantly impact the ecologic environment in the Nalenggele River basin, but few hydrogeological studies have been conducted in the inland arid basin. In this paper, two sections were chosen to analyze the groundwater discharge in the ...
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Case Study - Groundwater Discharge Permit - Plymouth, Massachusetts
The process of obtaining a groundwater discharge permit for a subdivision scale septic absorption system was faciliated by using the advanced GIS features within EnviroInsite. Geologic features were downloaded and presented at the site scale along with the subdivision boundary and potential downgradient receptors. A cross-section was created showing the detailed soil descriptions, water levels ...
By EI LLC
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Submarine groundwater discharge and alkaline earth element dynamics in a deltaic coastal setting
Submarine groundwater discharge is a process that is often considered negligible in deltaic systems given their low gradient and fine-grained sediment. However, hydrologic budgets and radon surveys indicate that it may be a significant component of the Mississippi River Delta system. To more concretely indicate groundwater's contribution to the local environment, we conducted an analysis of ...
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Estimating the submarine groundwater and nutrients discharge of Yellow River delta with cross-section method
In this paper, cross-section method was used to estimate the groundwater and nutrients discharge fluxing to the Bohai Sea from the Yellow River Delta. The flux of shallow phreatic groundwater (within 10 m) in the Yellow River Farm discharging into sea was 2.9 × 10−5 m3/m d in 2004 and 3.1 × 10−5 m3/m d in 2005. Time distribution monthly mean flux is consistent with the Yellow River's runoff but ...
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Evaluation of submarine groundwater discharge into the northern Bohai Bay, China using 226Ra
Submarine groundwater discharge (SGD) has been widely recognized as a significant source of water and dissolved material transport from land to ocean. To quantify SGD into the northern Bohai Bay, China, naturally occurring radium isotope (226Ra) was measured in water samples collected along two transects in September 2012. Based on a tidal prism model, two different flushing times of the ...
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Decentralized Wasterwater Treatment EcoTanks for the Riverside Communities od Barangay San Francisco: A CITYNET - funded Pilot and Demonstration
In many dense, low income areas of Southeast Asia and elsewhere, effective sanitation solutions are difficult to come by. These areas are often largely unserviced by sewerage systems and the residents may not have had the income available during their home’s construction to install a proper septic tank. Even if they did, unless a subsidized tank desludging program exists ...
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New Spanish regulation on groundwater protection
On 22 October it was issued Royal Decree 1514/2009 regulating the protection of groundwater against pollution and deterioration. The legal framework of this Royal Decree is formed by Directive 2000/60/EC (WFD) in particular Article 17, and Directive 20006/118/EC. The main objectives are to prevent or limit groundwater pollution and to establish criteria and procedures to assess their chemical ...
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Modeling the dynamics of the freshwater-saltwater interface in response to construction activities at a coastal site
Abstract: A numerical model was developed to evaluate the response of groundwater flow and the fresh-saltwater interface in relation to the construction of a particle accelerator at the coastal plain of Tokaimura, Japan. Undisturbed conditions were initially simulated and validated against field observations as a prerequisite for the analysis of predictive scenarios. Groundwater heads and the ...
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Identifying pathways and processes affecting nitrate and orthophosphate inputs to streams in Agricultural Watersheds
Understanding nutrient pathways to streams will improve nutrient management strategies and estimates of the time lag between when changes in land use practices occur and when water quality effects that result from these changes are observed. Nitrate and orthophosphate (OP) concentrations in several environmental compartments were examined in watersheds having a range of base flow index (BFI) ...
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Groundwater levels under climate change in the Gnangara system, Western Australia
The Gnangara system is the main source of freshwater for Perth, Western Australia. However, aquifers in the region are under severe stress due to a drying climate, intensive pumping and changes in land use. The aim of this study is to apply the mean rainfall cumulative deviation and Mann-Kendall analyses at 77 monitoring bores to investigate the response of the water table to key recharge ...
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Identifying pathways and processes affecting nitrate and orthophosphate inputs to streams in agricultural watersheds
Received for publication November 14, 2008. Understanding nutrient pathways to streams will improve nutrient management strategies and estimates of the time lag between when changes in land use practices occur and when water quality effects that result from these changes are observed. Nitrate and orthophosphate (OP) concentrations in several environmental compartments were examined in watersheds ...
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Landscape and weather controls on fine-scale calcareous fen hydrodynamics
Calcareous fens are species-rich peatlands thought to form at discrete alkaline groundwater discharge points. Here the spatial and temporal variability in the peat pore-water hydrodynamics at a fine (plot) scale of three calcareous fens in southern Ontario was investigated over three growing seasons to evaluate the sensitivity of these wetlands to weather fluctuation and landscape position. ...
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Water Cycle
The sun, which drives the water cycle, heats water in oceans and seas. Water evaporates as water vapor into the air. Ice and snow can sublimate directly into water vapor. Evapotranspiration is water transpired from plants and evaporated from the soil. Rising air currents take the vapor up into the atmosphere where cooler temperatures cause it to condense into clouds. Air currents move water vapor ...
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Activated carbon filled reactive mat chosen as low profile permeable capping remedy case study
Project: Zidell Marine Corporation Sediment Cap Location: Portland, OR Products: Reactive Core Mat filled with Granular Activated Carbon (GAC) and Apatite II Background: Cleanup is required for land which was contaminated with a variety of chemicals as a result of ship construction, ship breaking, and barge construction at a site where heavy industrial use dates back to the early 1900s. In ...
By CETCO
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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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Spatial variations of river–groundwater interactions from upstream mountain to midstream oasis and downstream desert in Heihe River basin, China
The Heihe River basin consists of three different characteristic regions: upstream mountain area, midstream oasis region, and downstream desert region. Understanding the river–groundwater interactions in different river reaches is important for sustainable water resources management. In this study, river–groundwater interactions in three different river regions are investigated by the ...
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DOT Highway Construction - Case study
Issues and Challenges: Excessive rainfall amounts Scheduling and project delays Sensitive nearby waters Stringent discharge requirements Groundwater flows Approaches and Solutions: Heavy sediment laden water threatened to breach the temporary retention basin sidewalls resulting in contamination of a nearby river. Liquid Biostar-CH was injected into the water as it was pumped from the ...
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Project - Simulation of Groundwater Flow in the vicinity of the proposed Reeb Quarry, Town of Wainfleet, Ontario
Client: David Ketcheson, Azimuth Environmental Consulting, 85 Bayfield Street, Suite 400, Barrie Ontario L4M 3A7 tel: (705) 721-8451 Key Personnel: E.J. Wexler, D. Kassenaar A groundwater flow model was developed for the proposed Reeb Quarry and surrounding area. The property is located south of the Wainfleet Bog and west of the City of Port Colborne. An active quarry and a rehabilitated quarry ...
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A framework for accurate geospatial modeling using image ranking and machine learning
There is a large class of modeling problems where the complexity of the underlying phenomena is overwhelming and hence the accuracy of mathematical models is limited. Our approach to this class of problems is to design frameworks that bring together physically based and data-driven models, and incorporate the tacit knowledge of experts by providing visual exploration and feedback capabilities. ...
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