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Journal articles on the topic 'Near-surface aquifer'

Author: Grafiati

Published: 9 November 2024

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1

Wu, Peipeng, Jean-Christophe Comte, Lijuan Zhang, Shuhong Wang, and Bin Chang. "Effect of Surface Water Level Fluctuations on the Performance of Near-Bank Managed Aquifer Recharge from Injection Wells." Water 13, no. 21 (2021): 3013. http://dx.doi.org/10.3390/w13213013.

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Managed aquifer recharge operations are often conducted in near-bank areas to regulate water resources or reduce seawater intrusion. Yet little is known about the influence of surface water level fluctuations at different temporal scales on MAR performance. A generalized conceptual model was developed based on an investigation site in Western China as a basis to simulate the response surface water level fluctuations on the water table, artificially recharged water lens (formed by the artificially recharged water), groundwater flow paths and average travel times (which is an important control o

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2

Sugiyanto, Didik, Ibnu Rusydy, Marwan Marwan, Dian Mutia Hidayati, and Asrillah Asrillah. "A PRELIMINARY STUDY ON AQUIFER IDENTIFICATION BASED ON GEO-ELECTRICAL DATA IN BANDA ACEH, INDONESIA." Jurnal Natural 18, no. 3 (2018): 122–26. http://dx.doi.org/10.24815/jn.v18i3.11204.

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The aquifers exploration has been conducted at the western part of Banda Aceh, Indonesia. This research aims to explore the aquifer layer beneath the surface and to obtain the cross-section model of the aquifer. The Vertical Electrical Sounding (VES) method was applied to investigate the aquifer layer. The VES method worked as the current penetrated into the ground using of two electrodes and the potential response due to its current being measured by another two electrodes. Ten grid points of VES has performed in western part of Krueng Aceh of Banda Aceh using the ARES (Automatic Resistivity

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3

Wumu, Rizky Hizrah, Ahmad Zainuri, and Noviar Akase. "Karakteristik Akuifer Menggunakan Metode Geolistrik Resistivity Di Kecamatan Kota Tengah Kota Gorontalo." Jambura Geoscience Review 4, no. 1 (2022): 60–68. http://dx.doi.org/10.34312/jgeosrev.v4i1.12752.

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Kota Tengah Subdistrict has the highest population density in Gorontalo City, with a population density of 6,755 people/km2. This high population density requires a large amount of water to meet the needs of the population, where one form of fulfillment is taken from groundwater. For this reason, it is necessary and important to know the characteristics of aquifers. This study aims to determine the characteristics of groundwater aquifers in the Kota Tengah Subdistrict. The method used is the resistivity geoelectric method to obtain aquifer characteristics in the form of material type (litholog

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Kocar, Benjamin D., Shawn G. Benner, and Scott Fendorf. "Deciphering and predicting spatial and temporal concentrations of arsenic within the Mekong Delta aquifer." Environmental Chemistry 11, no. 5 (2014): 579. http://dx.doi.org/10.1071/en13244.

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Environmental context Himalayan derived arsenic contaminates groundwater across Asia, ranging from the deltas of Ganges-Brahmaputra of Bangladesh to the interior basins of the Yangtze and Yellow Rivers in China, where more than one hundred million people are drinking water with hazardous levels of the toxin. Our ability to predict the distribution and changes in arsenic concentration in aquifers of affected regions has been limited. Here we provide a dynamic model that captures arsenic migration and can be used to forecast changes in groundwater arsenic concentrations. Abstract Unravelling the

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Mažeika, Jonas, Tõnu Martma, Rimantas Petrošius, Vaidotė Jakimavičiūtė-Maselienė, and Žana Skuratovič. "Radiocarbon and Other Environmental Isotopes in the Groundwater of the Sites for a Planned New Nuclear Power Plant in Lithuania." Radiocarbon 55, no. 2 (2013): 951–62. http://dx.doi.org/10.1017/s0033822200058100.

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The assessment of construction sites for the new Visaginas Nuclear Power Plant (Visaginas NPP), including groundwater characterization, took place over the last few years. For a better understanding of the groundwater system, studies on radiocarbon; tritium; stable isotopes of hydrogen, oxygen, and carbon; and helium content were carried out at the location of the new NPP, at the Western and Eastern sites, as well as in the near-surface repository (NSR) site. Two critical depth zones in the Quaternary aquifer system were characterized by different groundwater residence times and having slightl

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HENRY, J. L., P. R. BULLOCK, T. J. HOGG, and L. D. LUBA. "GROUNDWATER DISCHARGE FROM GLACIAL AND BEDROCK AQUIFERS AS A SOIL SALINIZATION FACTOR IN SASKATCHEWAN." Canadian Journal of Soil Science 65, no. 4 (1985): 749–68. http://dx.doi.org/10.4141/cjss85-080.

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The stratigraphy and hydrology of saline soils were investigated at 15 sites in Saskatchewan, Canada. At five sites (Series A) nests of piezometers were installed and at 10 sites (Series B) a single piezometer was installed in or near an aquifer. Piezometric surface data from the nests showed the potential for upward movement in all Series A sites. The electrical conductivity (EC) of water from Series A piezometers increased from the deepest to shallowest and there was a general increase in soil EC towards the soil surface. Hydraulic conductivity of strata was measured at three sites and varie

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Darsono, Darsono, Ahmad Marzuki, Nuryani Nuryani, and G. Yuliyanto. "Detection of groundwater aquifers using geoelectrical resistivity method (case study : Plupuh Sub-district, Sragen District )." Journal of Physics: Conference Series 2498, no. 1 (2023): 012004. http://dx.doi.org/10.1088/1742-6596/2498/1/012004.

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Abstract An aquifer is a layer below the ground surface that contains groundwater. Inside the earth there are unconfined aquifers and confined aquifers, where unconfined aquifers are located near the surface while confined aquifers are located very deep beneath the earth. This study aims to find the location, depth, and thickness of aquifers that have the potential to contain large amounts of groundwater. The instrument used in this research is a resistivity meter OYO Model 2119C Mc OHM-EL, with a Schlumberger configuration with a current electrode length of AB/2 to 350 meters. Data acquisitio

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Hinzman, Larry D., Matthew Wegner, and Michael R. Lilly. "Hydrologic Investigations of Groundwater and Surface-water Interactions In Subarctic Alaska." Hydrology Research 31, no. 4-5 (2000): 339–56. http://dx.doi.org/10.2166/nh.2000.0020.

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Dynamic interactions between rivers and adjacent aquifers can significantly affect near-bank geochemistry and processes associated with natural attenuation of contaminants by mixing water or introducing oxygen or nutrients. During 1997 and 1998 in a study near Fairbanks, Alaska U.S.A, the hydrologic conditions in the Chena River and in the adjacent groundwater were monitored. The river stage, groundwater elevations, and the water chemistry and temperature in both river and groundwater were measured. In the spring of 1997, the groundwater gradient close to the Chena River reversed causing surfa

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Mukherjee, S., E. A. Mohammad, and R. H. Worden. "Satellite data interpretation of causes and controls on groundwater-seawater flow directions, Merseyside, UK: implications for assessing saline intrusions." Hydrology and Earth System Sciences Discussions 2, no. 3 (2005): 887–916. http://dx.doi.org/10.5194/hessd-2-887-2005.

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Abstract. Groundwater in the Triassic Sherwood Sandstone aquifer, Liverpool, UK, has locally elevated chloride concentrations (~4000 mg/l) in parts of the coastal region although there is freshwater right up to the coast line in other areas. The aquifer is cut my numerous faults with vertical displacements of as much 300 m. SPOT satellite data have been used for the Merseyside area of Liverpool. The satellite data revealed and confirmed the location of some of the main faults since the fault zones of the aquifer have low permeability (due to grain crushing, cataclasis, and clay smearing). Wher

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10

Peñafiel, Lilia, Francisco Javier Alcalá, and Javier Senent-Aparicio. "Usefulness of Compiled Geophysical Prospecting Surveys in Groundwater Research in the Metropolitan District of Quito in Northern Ecuador." Applied Sciences 11, no. 23 (2021): 11144. http://dx.doi.org/10.3390/app112311144.

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As in other large Andean cities, the population in the Metropolitan District of Quito (MDQ) in northern Ecuador is growing, and groundwater is becoming essential to meet the increasing urban water demand. Quito’s Public Water Supply Company (EPMAPS) is promoting groundwater research for sustainable water supply, and geophysical prospecting surveys are used to define aquifer geometry and certain transient groundwater features. This paper examines the usefulness of existing geophysical prospecting surveys in groundwater research in the MDQ. A database was built using 23 representative geophysica

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Deeds, Neil, Michael Turco, Van Kelley, Christina Petersen, and Susan Baird. "Assessment of Subsidence Risk Associated with Brackish Groundwater Development in the Coastal Lowlands Aquifer, Houston, Texas, USA." Proceedings of the International Association of Hydrological Sciences 382 (April 22, 2020): 437–41. http://dx.doi.org/10.5194/piahs-382-437-2020.

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Abstract. Significant undeveloped brackish groundwater resources exist within the Coastal Lowlands Aquifer System (Gulf Coast Aquifer System) near Houston, Texas, USA. As the development of these frontier resources is imminent, an improved understanding of the impact development may have on the availability of the resource and land subsidence is needed. In this region, land subsidence is caused by the depressurization of the aquifer and compaction of the many clay lenses in the subsurface. The Gulf Coast Aquifer System in the study area includes three primary water bearing units (from shallow

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Broster, B. E., and D. A. Pupek. "The significance of buried landscape in subsurface migration of dense non-aqueous phase liquids; the case of perchloroethylene in the Sussex Aquifer, New Brunswick." Environmental and Engineering Geoscience 7, no. 1 (2001): 17–29. http://dx.doi.org/10.2113/gseegeosci.7.1.17.

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Abstract At Sussex, New Brunswick, dissolved perchloroethylene (PCE) as high as 28.0 mu g/liter, was detected within the upper aquifer and in concentrations to 1.6 mu g/liter within the lower aquifer that serves as the main source of municipal water supply. Predominantly formed as an esker ridge, the lower aquifer consists of well-sorted, glaciofluvial/ice-contact, sand and gravel layers mostly confined by underlying till and/or bedrock and an overlying unit of laminated silt-clay glaciolacustrine sediments (middle aquitard). The middle aquitard is in turn overlain by an upper aquifer of varia

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Dzakiya, Nurul, Muhammad Faizal Zakaria, Dewa Gede Eka Setiawan, and Robertus Belardo Laksmana. "Study of Groundwater Types Using the Vertical Electrical Sounding (VES) Method in the ‘Martani Field’ Ngemplak District of Yogyakarta." Journal of Applied Geospatial Information 5, no. 1 (2021): 457–61. http://dx.doi.org/10.30871/jagi.v5i1.2703.

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Study of groundwater types using the Vertical Electrical Sounding (VES) method in 'Martani Field’ Ngemplak District of Yogyakarta was done by carrying out eight measurement points to look for groundwater potential. This area is an area on the southern slopes of Mount Merapi which is included in the Yogyakarta Groundwater Basin. The type of lithology is identified based on the measurement of its resistivity value so that there are several types of lithology, namely Breccia (110-670 Ωm), Clay (1.99-10.12 Ωm), Sandstones (17.06-56.82 Ωm) and andesite lava (688-1657 Ωm). The bottom of the aquifer

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14

Moret, Geoff J., Michael D. Knoll, Warren Barrash, and William P. Clement. "Investigating the stratigraphy of an alluvial aquifer using crosswell seismic traveltime tomography." GEOPHYSICS 71, no. 3 (2006): B63—B73. http://dx.doi.org/10.1190/1.2195487.

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In this study, we investigate the use of crosswell P-wave seismic tomography to obtain spatially extensive information about subsurface sedimentary architecture and heterogeneity in alluvial aquifers. Our field site was a research wellfield in an unconfined aquifer near Boise, Idaho. The aquifer consists of a ∼ 20-m-thick sequence of alluvial cobble-and-sand deposits, which have been subdivided into five stratigraphic units based on neutron porosity logs, grain-size analysis, and radar reflection data. We collected crosswell and borehole-to-surface seismic data in wells [Formula: see text] apa

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15

Kotsev, Tsvetan, Sava Kolev, and Vladimir Hristov. "Modeling of groundwater flow and transport of pollutants caused by a difference in groundwater densities (on the example of the valley of Vulche dere creek, downstream of Eleshnitsa tailings pond)." Engineering Geology and Hydrogeology 32, no. 1 (2018): 3–12. http://dx.doi.org/10.52321/igh.32.1.3.

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An attempt is made to model numerically the transport of dissolved substances caused by a difference in groundwater densities. It is supposed that initially at the surface of the aquifer a sector exists with high concentration of а pollutant (sulphates) while it is zero elsewhere in it. As a result, there is a higher water density near the surface. Due to this difference, a density driven flow arises and starts slow upwelling and downwelling movement of the water. The pollution located initially at the surface moves down and after a period of time reaches the bottom of the aquifer. Unsteady Da

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Jodry, Clara, Dashgin Abakarov, Zaur Bayramov, Javid Aliyev, Nigar Karimova, and Murad Abdulla-Zada. "SEG Summer Field Camp: Multigeophysical imaging of an aquifer in the Astara region of Azerbaijan." Leading Edge 43, no. 7 (2024): 453–58. http://dx.doi.org/10.1190/tle43070453.1.

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Groundwater faces growing pressure due to human activities and the impacts of global climate change. Therefore, it is imperative to characterize near-surface aquifers, especially those that are unconfined because they are particularly vulnerable to these challenges. In Azerbaijan, alluvial plain aquifers represent a critical facet of the nation's water resources, yet they remain largely understudied. The objective of our study is to employ a multigeophysical survey (including electrical resistivity, seismic refraction, and ground-penetrating radar) to describe the subsurface attributes of an u

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Kelson, Vic, and Mark Bakker. "Using periodic analytic elements to analyze aquifer tests near surface waters." Computers & Geosciences 51 (February 2013): 56–63. http://dx.doi.org/10.1016/j.cageo.2012.02.032.

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18

Guo, Shulan, Changhong Yan, Liangchen Yu, and Yang You. "Design of the Supporting Structures for Large and Unusually Shaped Foundation Pit near the Yangtze River." Advances in Civil Engineering 2020 (March 25, 2020): 1–9. http://dx.doi.org/10.1155/2020/3831805.

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A large underground transportation hub is located on the west side of the Nanjing Youth Olympic Center, which is close to the embankment of the Yangtze River. The near-surface primarily comprises newly deposited soft soil of considerable thickness; the lower part is a riverbed-phase sandy soil containing two confined aquifers. The foundation pit requires deep excavation and has unusual shapes of “pit in pit” and “pit leaning pit.” For the convenience and safety of excavation, the piezometric head of the upper confined aquifer, where the pit bottom is located, reached 1 m below the bottom plane

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Somaratne, N., K. Smettem, J. Lawson, K. Nguyen, and J. Frizenschaf. "Hydrological functions of sinkholes and characteristics of point recharge in groundwater basins." Hydrology and Earth System Sciences Discussions 10, no. 9 (2013): 11423–49. http://dx.doi.org/10.5194/hessd-10-11423-2013.

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Abstract. Karstic limestone aquifers are hydrologically and hydrochemically extremely heterogeneous and point source recharge via sinkholes and fissures is a common feature. We studied three groundwater systems in karstic settings dominated by point source recharge in order to assess the relative contributions to total recharge from point sources using chloride and δ18O relations. Preferential groundwater flows were observed through an inter-connected network of highly conductive zones with groundwater mixing along flow paths. Measurements of salinity and chloride indicated that fresh water po

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Sağır, Çağdaş, Bedri Kurtuluş, and Moumtaz Razack. "Hydrodynamic Characterization of Mugla Karst Aquifer Using Correlation and Spectral Analyses on the Rainfall and Springs Water-Level Time Series." Water 12, no. 1 (2019): 85. http://dx.doi.org/10.3390/w12010085.

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Karst aquifers have been an important research topic for hydrologists for years. Due to their high storage capacity, karst aquifers are an important source of water for the environment. On the other hand, it is safety-critical because of its role in floods. Mugla Karst Aquifer (SW, Turkey) is the only major water-bearing formation in the close environs of Mugla city. Flooding in the wet season occurs every year in the recharge plains. The aquifer discharges by the seaside springs in the Akyaka district which is the main touristic point of interest in the area. Non-porous irregular internal str

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Boubaya, Djamel. "Combining Resistivity and Aeromagnetic Geophysical Surveys for Groundwater Exploration in the Maghnia Plain of Algeria." Journal of Geological Research 2017 (January 18, 2017): 1–14. http://dx.doi.org/10.1155/2017/1309053.

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The Maghnia plain in western Algeria is filled by Plio-Quaternary and Miocene sediments that rest unconformably on a basement of Jurassic rocks. Electrical sounding (VES), magnetic data, well information, and hydrogeological data have been used to explore for groundwater potential in the Maghnia plain. The interpretation of Schlumberger sounding data was first calibrated with the lithology of available nearby wells. Four geoelectrical layers were identified within the study area. They are a thin near surface topsoil layer with variable resistivities, a moderate resistive aquifer (15–30 ohm-m),

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Koehn, Weston J., Stacey E. Tucker-Kulesza, and David R. Steward. "Characterizing Riverbed Heterogeneity across Shifts in River Discharge through Temporal Changes in Electrical Resistivity." Journal of Environmental and Engineering Geophysics 25, no. 4 (2020): 581–87. http://dx.doi.org/10.32389/jeeg20-049.

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The fluxes between groundwater and surface water play a significant role in quantifying water balance along stream reaches to continent scales. Changes in these dynamics are occurring due to aquifer depletion, where pre-development baseflow conditions have transitioned to losing conditions. This problem is studied along the Arkansas River in Western Kansas across a stream reach that transitions from near steady state to losing conditions, and contributes focused recharge to a depleting Ogallala Aquifer. Existing hydrologic data illustrates the lack of understanding they provide related to the

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Mari, J. L., and G. Porel. "3D Seismic Imaging of a Near-Surface Heterogeneous Aquifer: A Case Study." Oil & Gas Science and Technology - Revue de l'IFP 63, no. 2 (2007): 179–201. http://dx.doi.org/10.2516/ogst:2007077.

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MacDonald, Thomas R., and Peter K. Kitanidis. "Modeling the Free Surface of an Unconfined Aquifer Near a Recirculation Well." Ground Water 31, no. 5 (1993): 774–80. http://dx.doi.org/10.1111/j.1745-6584.1993.tb00850.x.

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Abu Rajab, Jafar Sadi, and Ali Ramadan El-Naqa. "Mapping groundwater salinization using transient electromagnetic and direct current resistivity methods in Azraq Basin, Jordan." GEOPHYSICS 78, no. 2 (2013): B89—B101. http://dx.doi.org/10.1190/geo2011-0362.1.

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Hydrogeophysical characterization using the transient electromagnetic method (TEM) and the DC resistivity sounding (VES) method was implemented in the central part of Azraq Basin (Qa Basin), Jordan, to identify and map the spatial distribution of shallow fresh and saline groundwater in the upper aquifer systems. The alluvium (Al) and chert limestone (URC) shallow aquifers show different degrees of groundwater salinization. The range of groundwater resistivity varies from 0.06 to 10.8 ohm-m. Saline groundwater was detected at depths between 5 to 30 m where the aquifers have a wide spectrum of r

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Tokarevsky, O., and I. Iarmosh. "Assessing Impact of Sorption in Geological Medium on Permissible Activity of Radioactive Waste in Near-Surface Disposal Facilities." Nuclear and Radiation Safety, no. 3(75) (August 22, 2017): 34–39. http://dx.doi.org/10.32918/nrs.2017.3(75).06.

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The paper considers the conservative scenario of potential exposure that envisages simultaneous destruction of barriers with simultaneous release of radionuclides by the example of Lot 3 near-surface radioactive waste disposal facility at the Vektor Industrial Complex located in the Chornobyl Exclusion Zone. A conceptual model that considers migration of radionuclides through the aeration zone and aquifer to the potable water well, as well as mixing of infiltration water containing radionuclides with ground water in case of reaching the aquifer, was developed to analyze the mentioned scenario.

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Lewandowski, J., K. Meinikmann, F. Pöschke, G. Nützmann, and D. O. Rosenberry. "From submarine to lacustrine groundwater discharge." Proceedings of the International Association of Hydrological Sciences 365 (March 2, 2015): 72–78. http://dx.doi.org/10.5194/piahs-365-72-2015.

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Abstract. Submarine groundwater discharge (SGD) and its role in marine nutrient cycling are well known since the last decade. The freshwater equivalent, lacustrine groundwater discharge (LGD), is often still disregarded, although first reports of LGD are more than 50 years old. We identify nine different reasons why groundwater has long been disregarded in both freshwater and marine environments such as invisibility of groundwater discharge, the size of the interface and its difficult accessibility. Although there are some fundamental differences in the hydrology of SGD and LGD, caused primari

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Kobierska, F., T. Jonas, J. W. Kirchner, and S. M. Bernasconi. "Linking baseflow separation and groundwater storage dynamics in an alpine basin (Dammagletscher, Switzerland)." Hydrology and Earth System Sciences 19, no. 8 (2015): 3681–93. http://dx.doi.org/10.5194/hess-19-3681-2015.

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Abstract. This study aims at understanding interactions between stream and aquifer in a glacierized alpine catchment. We specifically focused on a glacier forefield, for which continuous measurements of stream water electrical conductivity, discharge and depth to the water table were available over 4 consecutive years. Based on this data set, we developed a two-component mixing model in which the groundwater component was modelled using measured groundwater levels. The aquifer actively contributing to streamflow was assumed to be constituted of two linear storage units. Calibrating the model a

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Chen, Xi, Yan-fang Zhang, Xianwu Xue, Zhicai Zhang, and Lingna Wei. "Estimation of baseflow recession constants and effective hydraulic parameters in the karst basins of southwest China." Hydrology Research 43, no. 1-2 (2012): 102–12. http://dx.doi.org/10.2166/nh.2011.136.

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By analysing the hydrographs of karst basin outflow, it is possible to identify aquifer characteristics and, accordingly, the main features of a karst basin. In this study, 19 basins with daily observed flow discharges during drought periods between October and April 1973–1983 were selected to analyse the master recession curve (MRC). During a drought period, the MRCs were separated into segments of fast flow exponential recession and slow flow exponential recession. Break points of the fast and slow recession segments were identified and the recession constants α were determined. Relationship

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Richards, Laura A., Daniel Magnone, Jürgen Sültenfuß, et al. "Dual in-aquifer and near surface processes drive arsenic mobilization in Cambodian groundwaters." Science of The Total Environment 659 (April 2019): 699–714. http://dx.doi.org/10.1016/j.scitotenv.2018.12.437.

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Lauber, U., W. Ufrecht, and N. Goldscheider. "Spatially resolved information on karst conduit flow from in-cave dye-tracing." Hydrology and Earth System Sciences Discussions 10, no. 9 (2013): 11311–35. http://dx.doi.org/10.5194/hessd-10-11311-2013.

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Abstract. Artificial tracers are powerful tools to investigate karst systems. Tracers are commonly injected into sinking streams or dolines, while springs serve as monitoring sites. The obtained flow and transport parameters represent mixed information from the vadose, epiphreatic and phreatic zones, i.e., the aquifer remains a black box. Accessible active caves constitute valuable but underexploited natural laboratories to gain detailed insights into the hydrologic functioning of the aquifer. Two multi-tracer tests in the catchment of a major karst spring (Blautopf, Germany) with injections a

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Voloshyn, P. "The flooding of Lviv territory: reasons, patterns of development, ecological consequences." Visnyk of the Lviv University. Series Geography, no. 39 (December 15, 2011): 72–77. http://dx.doi.org/10.30970/vgg.2011.39.2164.

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Flooding territories of Lviv occupy area more than 50 km2 . The largest area of technogenic flooding belongs to Lviv plateau. Highly dissected parts of Roztochchya belong to nonflooding. Main nature reasons of flooding development are near to surface occurrence waterproof deposits and leveled relief. Technogenic flooding are outflows of water from engineer networks and infraction of surface water. Key words: flooding, technogenic aquifer, soil waters, waterproof deposits, cultural layer, seismicity.

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Husain, Muin M., John A. Cherry, Scott Fidler, and Shaun K. Frape. "On the long-term hydraulic gradient in the thick clayey aquitard in the Sarnia region, Ontario." Canadian Geotechnical Journal 35, no. 6 (1998): 986–1003. http://dx.doi.org/10.1139/t98-057.

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Much of the southwestern part of Ontario between Lake Huron and Lake Erie has a thin freshwater aquifer overlain by an aquitard of Late Pleistocene clayey glaciolacustrine deposits and underlain by a thick Devonian shale aquitard. In a large area east of the St. Clair River, where the Quaternary aquitard is 30-50 m thick, groundwater of Pleistocene origin (identified by 18O and 2H signature) occurs in the aquifer and in the bottom part of the Quaternary aquitard. Numerous piezometer nests in the aquitard show a downward hydraulic gradient with depth. In some areas, the aquitard has downward gr

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Christner, Brent C., Heather F. Lavender, Christina L. Davis, et al. "Microbial processes in the weathering crust aquifer of a temperate glacier." Cryosphere 12, no. 11 (2018): 3653–69. http://dx.doi.org/10.5194/tc-12-3653-2018.

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Abstract. Incident solar radiation absorbed within the ablation zone of glaciers generates a shallow perched aquifer and seasonal icebound microbial habitat. During the melt seasons of 2014 and 2015, borehole investigations were used to examine the physical, geochemical, and microbiological properties in the near-surface ice and aquifer of the temperate Matanuska Glacier (south-central Alaska). Based on temperature, solar forcing, and ice optical properties, the dissipation of shortwave radiation promoted internal melting and the formation of a weathering crust with a maximum depth of ∼2 m. Bo

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Lauber, U., W. Ufrecht, and N. Goldscheider. "Spatially resolved information on karst conduit flow from in-cave dye tracing." Hydrology and Earth System Sciences 18, no. 2 (2014): 435–45. http://dx.doi.org/10.5194/hess-18-435-2014.

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Abstract. Artificial tracers are powerful tools for investigating karst systems. Tracers are commonly injected into sinking streams or dolines, while springs serve as monitoring sites. The obtained flow and transport parameters represent mixed information from the vadose, epiphreatic and phreatic zones (that is, the aquifer remains a black box). Accessible active caves constitute valuable but underexploited natural laboratories to gain detailed insights into the hydrologic functioning of the aquifer. Two multi-tracer tests in the catchment of a major karst spring (Blautopf, Germany) with injec

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Giudici, M., M. Manera, and E. Romano. "The use of hydrological and geoelectrical data to fix the boundary conditions of a ground water flow model: a case study." Hydrology and Earth System Sciences 7, no. 3 (2003): 297–303. http://dx.doi.org/10.5194/hess-7-297-2003.

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Abstract. To assess whether the hydrometric level of an artificial lake in a quarry near Milan (Italy) could be assigned as a Dirichlet boundary condition for the phreatic aquifer in a fine scale groundwater flow model, hydrological measurements of piezometric head and rainfall rate time series have been analysed by spectral and statistical methods. The piezometric head close to the quarry lake proved to be well correlated with seasonal variations in the rainfall. Furthermore, geoelectrical tomography detected no semi-permeable layer between the phreatic aquifer and the lake, so the contact be

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Ibarra-Olivares, Guadalupe, Raúl Miranda-Avilés, José A. Ramos-Leal, et al. "Hydrogeochemical Characterization of Groundwater at the Boundaries of Three Aquifers in Central México." Water 15, no. 22 (2023): 3948. http://dx.doi.org/10.3390/w15223948.

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This study investigates the natural hydrogeochemical mechanisms that govern groundwater chemistry at the margins of the Silao-Romita, Valle de León, and La Muralla aquifers in Mexico’s “Bajío Guanajuatense”. The wells of the La Muralla aquifer have temperatures ranging from 25 to 45 °C, while in the valleys, the temperatures range from 25 to 29 °C. In the Sierra de Guanajuato recharge zone, the thermal spring registers 95 °C. High Na concentrations (125 to 178 mg/L) are measured due to thermalism. One sample includes 316 mg/L of SO4, which is related to a potential gypsum zone. Three hydrogeoc

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Husain, Muin M., John A. Cherry, and Shaun K. Frape. "The persistence of a large stagnation zone in a developed regional aquifer, southwestern Ontario." Canadian Geotechnical Journal 41, no. 5 (2004): 943–58. http://dx.doi.org/10.1139/t04-040.

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An extensive groundwater zone of exceptionally negative δ18O (17.5 to 16.0) exists in a thin, regional, freshwater aquifer between Lake St. Clair and the southern shore of Lake Huron in southwestern Ontario. The zone occurs at the interface between the overlying thick Quaternary clay aquitard of glaciolacustrine origin and the underlying bedrock shale. This isotope signature, which is 7 more negative (lighter) than modern water, indicates a Late Pleistocene origin of the aquifer water. This zone occurs only where the Quaternary aquitard is greater than 35 m thick. In the Quaternary aquita

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Slade, Raymond Maurice. "A recharge-discharge water budget and evaluation of water budgets for the Edwards Aquifer associated with Barton Springs." Texas Water Journal 8, no. 1 (2017): 42–56. http://dx.doi.org/10.21423/twj.v8i1.7020.

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The Barton Springs segment of the Edwards Aquifer represents a small, relatively independent part of the aquifer. Data for the sources of recharge and especially for discharge from the aquifer are well documented. Based on a 6-year water budget of surface recharge and surface discharge, the volumes match within 5%, which is within the potential error limits of the recharge and discharge values. Recharge volumes include increased runoff due to urbanization in the recharge area. A previous water budget based on an earlier period also displayed a balance between recharge and discharge volumes. Bo

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Trček, Branka, and Beno Mesarec. "Impact of the Hydroelectric Dam on Aquifer Recharge Processes in the Krško Field and the Vrbina Area: Evidence from Hydrogen and Oxygen Isotopes." Water 15, no. 3 (2023): 412. http://dx.doi.org/10.3390/w15030412.

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The impact of the damming of the Sava river for the Brežice hydroelectric power plant on the rise of the groundwater level was studied in the intergranular aquifer of the Krško field and the Vrbina area, Slovenia. The study is based on the application of hydrogen and oxygen isotopes (18O, 2H and 3H). Parameters were determined for precipitation, surface water, and groundwater for periods before and after the filling of the accumulation basin, with the aim of evaluating the groundwater–surface water interaction and to elucidate the impact of the hydroelectric dam on aquifer recharge processes.

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Eastoe, Christopher, Barry Hibbs, Mercedes Merino, and Jason Dadakis. "Origins of Sulfate in Groundwater and Surface Water of the Rio Grande Floodplain, Texas, USA and Chihuahua, Mexico." Hydrology 9, no. 6 (2022): 95. http://dx.doi.org/10.3390/hydrology9060095.

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Sulfate isotopes (δ34S, δ18OSO4) interpreted in conjunction with sulfate concentrations show that sulfate of both agricultural and geologic sources is present in groundwater and surface water in the Rio Grande flood plain within the Hueco Bolsón. From previous studies, water isotopes (δ2H, δ18O) in the study area indicate groundwater age relative to dam construction upstream. Surface water entering the Hueco Bolsón contains a mixture of soil-amendment sulfate and sulfate from deep-basin groundwater seeps at the terminus of Mesilla Valley. In the shallow Rio Grande alluvial aquifer within the H

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Balia, Roberto, Enrico Gavaudò, Federica Ardau, and Giorgio Ghiglieri. "Geophysical approach to the environmental study of a coastal plain." GEOPHYSICS 68, no. 5 (2003): 1446–59. http://dx.doi.org/10.1190/1.1620618.

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In the study of coastal plains affected by soil and water salination, a knowledge of several geological aspects, such as structural features, depth to basement, stratigraphy of sedimentary cover, relationships between the phreatic aquifer and underlying aquifers, and the latter's structure, is basic to gaining an adequate understanding of both the causes and possible evolution of salination. In this framework, geophysical techniques can play a very important role. To improve the available geophysical information about the Muravera coastal plain, Sardinia, Italy, which is affected by severe soi

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D A, Ogwu, Molua O C, Ighodalo E.J, and Edobor M. "Hydrogeophysical Investigation of Aquifer Layers in Nkporo, Ohafia Local Government Area." Journal of Energy Engineering and Thermodynamics, no. 24 (July 5, 2022): 8–15. http://dx.doi.org/10.55529/jeet.24.8.15.

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Drilling a borehole in Nkporo area of Ohafia in Abia state without proper investigation may lead to wasting resources if water bearing formation is not achieved. This is because borehole drilling is very expensive. It is therefore necessary to carry out proper hydro-geophysical investigation in order to identify a good aquifer before borehole drilling. Electrical resistivity method has been chosen for the investigation of the water bearing formation. The use of Schlumberger array (Vertical Electrical Sounding (VES)) method of electrical resistivity was chosen based on the geology of the study

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Duckett, Kyle, Jeff Langman, John Bush, Erin Brooks, Pamela Dunlap, and Jeffrey Welker. "Isotopic Discrimination of Aquifer Recharge Sources, Subsystem Connectivity and Flow Patterns in the South Fork Palouse River Basin, Idaho and Washington, USA." Hydrology 6, no. 1 (2019): 15. http://dx.doi.org/10.3390/hydrology6010015.

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Groundwater studies in the South Fork Palouse River Basin have been unable to determine recharge sources, subsystem connectivity and flow patterns due to the discontinuity of pathways in the heterogeneous and anisotropic aquifers located in Columbia River flood basalts and interbedded sediments. Major ion, δ18O, δ2H, δ13C, δ34S and temperature for groundwater collected from 28 wells of varying depths indicate a primary recharge source dominated by snowmelt along the eastern basin margin. This recharge can be separated into two distinct sources—a deeper and relatively less altered snowmelt sign

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Slimani, Rabia, Abdelhamid Guendouz, Fabienne Trolard, Adnane Souffi Moulla, Belhadj Hamdi-Aïssa, and Guilhem Bourrié. "Identification of dominant hydrogeochemical processes for groundwaters in the Algerian Sahara supported by inverse modeling of chemical and isotopic data." Hydrology and Earth System Sciences 21, no. 3 (2017): 1669–91. http://dx.doi.org/10.5194/hess-21-1669-2017.

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Abstract. Unpublished chemical and isotopic data taken in November 1992 from the three major Saharan aquifers, namely the Continental Intercalaire (CI), the Complexe Terminal (CT) and the phreatic aquifer (Phr), were integrated with original samples in order to chemically and isotopically characterize the largest Saharan aquifer system and investigate the processes through which groundwaters acquire their mineralization. Instead of classical Debye–Hückel extended law, a specific interaction theory (SIT) model, recently incorporated in PHREEQC 3.0, was used. Inverse modeling of hydrochemical da

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46

Kobierska, F., T. Jonas, J. Kirchner, and S. M. Bernasconi. "Linking baseflow separation and groundwater storage dynamics in an alpine basin (Dammagletscher, Switzerland)." Hydrology and Earth System Sciences Discussions 11, no. 11 (2014): 12187–221. http://dx.doi.org/10.5194/hessd-11-12187-2014.

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Abstract. This study aims at understanding interactions between stream and aquifer in a glacierized alpine catchment. We specifically focused on a glacier forefield, for which continuous measurements of stream water electrical conductivity, discharge and depth to the water table were available over four consecutive years. Based on this dataset, we developed a two-component mixing model in which the groundwater component was modelled using measured groundwater levels. The aquifer actively contributing to stream flow was assumed to be a superposition of two linear storage units. Calibrating the

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Pryambodo, Dino Gunawan, Joko Pihantono, Reiner Arief Troa, and Eko Triarso. "Identifikasi Akuifer Dangkal di Pulau Terdepan NKRI dengan Menggunakan Metode Geolistrik 2D: Studi Kasus Pulau Laut, Kab. Natuna." EKSPLORIUM 37, no. 1 (2016): 51. http://dx.doi.org/10.17146/eksplorium.2016.37.1.2667.

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Kebutuhan akan air bersih untuk menunjang aktivitas masyarakat di bidang perikanan di pulau terluar sangat diperlukan karena di lokasi tersebut kondisinya minim sumber air tawar. Penelitian geofisika dengan metode Geolistrik 2D telah dilakukan untuk mengidentifikasikan keberadaan akuifer di Pulau Laut, Kabupaten Natuna sebagai pulau terluar dari wilayah Negara Kesatuan Republik Indonesia (NKRI). Pengukuran di lapangan dengan enam lintasan geolistrik 2D menggunakan konfigurasi Wenner, bentangan kabel 160 meter, untuk mendapatkan kedalaman penetrasi 26,9 meter di bawah permukaan. Data tahanan je

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Chen, Jung Wei, Kuan Wei Chen, Jung Nan Chang, Sun Zone Lee, and C. H. Lee. "Evaluation on the River Seepage under Groundwater Pumping near Riverside." Applied Mechanics and Materials 212-213 (October 2012): 383–90. http://dx.doi.org/10.4028/www.scientific.net/amm.212-213.383.

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Abstract. Groundwater is to be pumping near the riverside could be induced recharge from the river surface and lateral aquifer layers, and could be reduced the negative effect on the aquifer. In this research, proposes the method of pumping groundwater from the Maoluo riverside and assesses the effect on the riverbank filtration in the middle of Taiwan. This research constructed the four analytical models using MODFLOW to identify the reliability of numerical model. Five groundwater pumping schemes based on the assessment on the effect of the Maoluo river seepage were implemented. For replace

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Steiakakis, Emmanouil, Dionysios Vavadakis, and Ourania Mourkakou. "Groundwater Vulnerability and Delineation of Protection Zones in the Discharge Area of a Karstic Aquifer—Application in Agyia’s Karst System (Crete, Greece)." Water 15, no. 2 (2023): 231. http://dx.doi.org/10.3390/w15020231.

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This work represents a contribution to the protection techniques of karst aquifers against groundwater pollution. The paper sets out the methodology being introduced for the protection of the karstic system that gives rise to five (5) major groups of springs and supplies fourteen (14) pumping wells near Agyia Chania (Crete, Greece). Starting from a geological and hydrogeological survey of the area, the work presents a vulnerability assessment of the karstic aquifer based on the application of three index-based methods (EPIK, PRESK and DRISTPI). The protection zones for the discharge area of th

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Ramachandran, Kumar, Bryan Tapp, Tayler Rigsby, and Erin Lewallen. "Imaging of Fault and Fracture Controls in the Arbuckle-Simpson Aquifer, Southern Oklahoma, USA, through Electrical Resistivity Sounding and Tomography Methods." International Journal of Geophysics 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/184836.

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Arbuckle-Simpson aquifer in southern Oklahoma, USA, is a major source of water for industrial and municipal use. It is also a major source for spring-fed streams in the area. As part of an ongoing study to map and characterize the Arbuckle-Simpson aquifer, an electrical resistivity tomography (ERT) study and electrical resistivity sounding studies were conducted in Johnston County, Oklahoma, USA, to map the subsurface of a small area of the carbonate aquifer. The main aim of the study was to obtain constraints on the location of near surface faults and fractures and how they control groundwate

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