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Ground Water

Sarah K Marshall, Peter G Cook, Anthony D Miller, Craig T Simmons, Shawan Dogramaci
In large-scale pumping projects, such as mine dewatering, predictions are often made about the rate of groundwater level recovery after pumping has ceased. However, these predictions may be impacted by geological uncertainty-including the presence of undetected impermeable barriers. During pumping, an impermeable barrier may be undetected if it is located beyond the maximum extent of the cone of depression; yet it may still control drawdown during the recovery phase. This has implications for regional-scale modelling and monitoring of groundwater level recovery...
January 7, 2019: Ground Water
Ferenc Székely, Péter Szűcs, Balázs Zákányi
Following Hemker and Maas (1987) the models of 2 or 3 leaky aquifers are applied to simulate the flow to vertical wells operating in the fractured or dual porosity aquifers. The software WT (Székely 2015) is used for calculating the drawdown and discharge rate variation. The comparative analysis with the independent analytical solutions by Boulton and Streltsova-Adams (1978), Warren and Root (1963), Kazemi et al. (1969) concluded with acceptable agreement between the WT simulation and the alternate calculation methods...
January 7, 2019: Ground Water
F Mullen, H Boogaerdt, R Archer
The Kockatea Shale is a proposed target for unconventional gas development in the North Perth Basin in Western Australia. This research is concerned with correlating the extent of thermogenic gas leakage into deep aquifers overlying the Kockatea Shale with an assessment of how close the formation is to mechanical failure. Data from two petroleum exploration wells located approximately 20km apart were considered. Both have comparable stratigraphy, however, they differ by their local tectonic setting. The stress regime is strike slip at Arrowsmith 2 well and for an assumed hydrostatic pressure the Kockatea Shale is not close to frictional limits...
December 25, 2018: Ground Water
Feihe Kong, Jinxi Song, Yan Zhang, Guobin Fu, Dandong Cheng, Guotao Zhang, Ying Xue
As a crucial agricultural and economic development zone since the Qin Dynasty (221 to 206 BC), the Guanzhong section of the Weihe River Basin is facing serious water resource shortages due to population growth and regional development. Its water resource amount per capita is only 361 m3 , about 1/6 of the average in China and less than 1/20 of the average in the world. Surface water and groundwater (SW-GW) interaction, having a significant influence on the spatiotemporal distribution of water resources, was qualitatively and quantitatively investigated during a wet year based on stable isotopes and hydrochemistry...
December 23, 2018: Ground Water
Franklin W Schwartz, Yiding Zhang, Motomu Ibaraki
This paper shows how important the historical contaminant boom, 1975-2005, has been to hydrogeology. Its role in this respect has never been well documented or appreciated. We use text mining and machine learning to extract information describing research trends in subsurface hydrology (SH), in groundwater plus the vadose zone. The analysis, using articles from Water Resources Research (WRR) and Environmental Science and Technology (ES&T), shows how SH grew from a small niche area within broader hydrologic sciences in the 1960s to become the dominant area of research by 1995...
December 21, 2018: Ground Water
David Deming
No abstract text is available yet for this article.
December 19, 2018: Ground Water
Claire Carlier, Stefanie B Wirth, Fabien Cochand, Daniel Hunkeler, Philip Brunner
This study investigates how catchment properties influence low-flow dynamics. With 496 synthetic models composed of a bedrock and an alluvial aquifer, we systematically assess the impact of the hydraulic conductivity of both lithologies, of the hillslope and of the river slope on catchment dynamics. The physically-based hydrogeological simulator HydroGeoSphere is employed, which allows obtaining a range of low-flow indicators. The hydraulic conductivity of the bedrock Kbedrock , a proxy for transmissivity, is the only catchment property exerting an overall control on low flows and explains 60% of the variance of Q95/Q50...
December 7, 2018: Ground Water
Steven J Berg, Edward A Sudicky
No abstract text is available yet for this article.
December 4, 2018: Ground Water
Mason O Stahl
No abstract text is available yet for this article.
November 26, 2018: Ground Water
Grant Ferguson, Jennifer C McIntosh
No abstract text is available yet for this article.
November 26, 2018: Ground Water
Fabien Cochand, René Therrien, Jean-Michel Lemieux
The potential impact of climate change on water resources has been intensively studied for different regions and climates across the world. In regions where winter processes such as snowfall and melting play a significant role, anticipated changes in temperature might significantly affect hydrological systems. To address this impact, modifications have been made to the fully-integrated surface-subsurface flow model HydroGeoSphere (HGS) to allow the simulation of snow accumulation and melting. The modified HGS model was used to assess the potential impact of climate change on surface and subsurface flow in the Saint-Charles River catchment, Quebec (Canada) for the period 2070-2100...
November 19, 2018: Ground Water
B S Gilfedder, I Cartwright, H Hofmann, S Frei
Transient storage zones (TSZs) are located at the interface of rivers and their abutting aquifers and play an important role in hydrological and biogeochemical functioning of rivers. The natural radioactive tracer 222 Rn is a particularly well-suited tracer for studying TSZ water exchange and age. Although 222 Rn measurement techniques have developed rapidly, there has been less progress in modelling 222 Rn activities. Here we combine field measurements with the numerical model HydroGeoSphere (HGS) to simulate 222 Rn emanation, decay and transport during steady state (riffle-pool sequence) and transient (bank storage) conditions...
November 18, 2018: Ground Water
Courtney R Scruggs, Martin Briggs, Frederick D Day-Lewis, Dale Werkema, John W Lane
The characterization of pore-space connectivity in porous media at the sediment/water interface is critical to understanding contaminant transport and reactive biogeochemical processes in zones of groundwater and surface-water exchange. Previous in situ studies of dual-domain (i.e., mobile/less-mobile porosity) studies have been limited to solute tracer injections at scales of meters to 100s of meters and subsequent numerical model parameterization using fluid concentration histories. Pairing fine-scale (e...
November 14, 2018: Ground Water
Steven J Berg, Nancy R Grosso, Michael P Sherrier, Kevin Mudrick, Matthias Ohr, Hyoun-Tae Hwang, Young-Jin Park, Michael V Callaghan, Steven K Frey, Edward A Sudicky
The interaction between surface water and groundwater during flood events is a complex process that has traditionally been described using simplified analytical solutions, or abstracted numerical models. To make the problem tractable, it is common to idealize the flood event, simplify river channel geometry, and ignore bank soil heterogeneity, often resulting in a model that only loosely represents the site, thus limiting its applicability to any specific river cross-section. In this study, we calibrate a site-specific fully-integrated surface and subsurface HydroGeoSphere model using flood events for a cross-section along the South River near Waynesboro, VA...
November 8, 2018: Ground Water
Oliver S Schilling, Young-Jin Park, René Therrien, Ranjeet M Nagare
For the simulation of winter hydrological processes a gap in the availability of flow models existed: one either had the choice between (a) physically-based and fully-integrated, but computationally very intensive, or (b) simplified and compartamentalized, but computationally less expensive simulators. To bridge this gap, we here present the integration of a computationally efficient representation of winter hydrological processes (snowfall, snow accumulation, snowmelt, pore water freeze-thaw) in a fully-integrated surface water-groundwater flow model...
November 5, 2018: Ground Water
Alraune Zech, Sabine Attinger, Alberto Bellin, Vladimir Cvetkovic, Peter Dietrich, Aldo Fiori, Georg Teutsch, Gedeon Dagan
Transverse dispersion, or tracer spreading orthogonal to the mean flow direction, which is relevant e.g, for quantifying bio-degradation of contaminant plumes or mixing of reactive solutes, has been studied in the literature less than the longitudinal one. Inferring transverse dispersion coefficients from field experiments is a difficult and error-prone task, requiring a spatial resolution of solute plumes which is not easily achievable in applications. In absence of field data, it is a questionable common practice to set transverse dispersivities as a fraction of the longitudinal one, with the ratio 1/10 being the most prevalent...
October 31, 2018: Ground Water
Nathan L Young, Jacqueline E Reber, William W Simpkins
Fractures in porous media have been documented extensively. However, they are often omitted from groundwater flow and mass transport models due to a lack of data on fracture hydraulic properties and the computational burden of simulating fractures explicitly in large model domains. We present a MATLAB toolbox, FracKfinder, that automates HydroGeoSphere (HGS), a variably-saturated, control volume finite-element model, to simulate an ensemble of discrete fracture network (DFN) flow experiments on a single cubic model mesh containing a stochastically-generated fracture network...
October 31, 2018: Ground Water
Amir Safi, Troels Norvin Vilhelmsen, Ibrahim Alameddine, Majdi Abou Najm, Mutasem El-Fadel
Groundwater model predictions are often uncertain due to inherent uncertainties in model input data. Monitored field-data are commonly used to assess the performance of a model and reduce its prediction uncertainty. Given the high cost of data collection, it is imperative to identify the minimum number of required observation wells and to define the optimal locations of sampling points in space and depth. This study proposes a design methodology to optimize the number and location of additional observation wells that will effectively measure multiple hydrogeological parameters at different depths...
October 30, 2018: Ground Water
Chengcheng Li, Xubo Gao
Dramatic decreases in groundwater quality have raised widespread concerns about water supplies and ecological crises in China. In this study, hydrochemistry, stable isotopes, graphical and multivariate statistical methods are integrated to identify hydrogeochemical processes controlling groundwater quality in the Yuncheng Basin, China. Our results show that groundwater with 21 variables (pH, temperature-T, TDS, major-trace elements and stable isotopes) is chemically classified into three distinct clusters: fresh water [C1], brackish-saline water [C2], and saline water [C3]...
October 30, 2018: Ground Water
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No abstract text is available yet for this article.
November 2018: Ground Water
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