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  • Poroelastic Modeling of a Heterogeneous Geologic Medium: A Case Study from Kanto Basin in Japan
    Groundwater (IF 2.205) Pub Date : 2020-12-28
    Ajit Joshi; Masaatsu Aichi; Tomochika Tokunaga

    Vertical geological heterogeneity, such as clay content and grain size variation, may affect land subsidence caused by groundwater extraction. In order to test this hypothesis, one‐dimensional pore‐water mass balance and force balance equations of a water‐saturated poroelastic medium were solved under different heterogeneous geological conditions. Results showed that clay content and grain size variation

    更新日期:2021-01-14
  • Review of Modeling Approaches to Groundwater Flow in Deformed Carbonate Aquifers
    Groundwater (IF 2.205) Pub Date : 2020-12-24
    Giacomo Medici; Luca Smeraglia; Anita Torabi; Chartlotte Botter

    We discuss techniques to represent groundwater flow in carbonate aquifers using the three existing modeling approaches: equivalent porous medium, conduit network, and discrete fracture network. Fractures in faulted stratigraphic successions are characterized by dominant sets of sub‐vertical joints. Grid rotation is recommended using the equivalent porous medium to match higher hydraulic conductivity

    更新日期:2021-01-12
  • High‐Resolution Integrated Transport Model for Studying Surface Water–Groundwater Interaction
    Groundwater (IF 2.205) Pub Date : 2020-12-28
    Tabea Broecker; Vahid Sobhi Gollo; Aryeh Fox; Jörg Lewandowski; Gunnar Nützmann; Shai Arnon; Reinhard Hinkelmann

    Transport processes that lead to exchange of mass between surface water and groundwater play a significant role for the ecological functioning of aquatic systems, for hydrological processes and for biogeochemical transformations. In this study, we present a novel integral modeling approach for flow and transport at the sediment–water interface. The model allows us to simultaneously simulate turbulent

    更新日期:2021-01-12
  • Nitrogen Overload: Environmental Degradation, Ramifications, and Economic Costs
    Groundwater (IF 2.205) Pub Date : 2021-01-11
    Casey D. Kennedy

    Nitrogen is abundant in the Earth's atmosphere, but it exists primarily as an unreactive form that is relatively inaccessible by most organisms. Although the formation of reactive nitrogen is a natural process, it can be dramatically altered by human activities such as biomass burning, combustion of fossil fuels, and production of synthetic fertilizers, which collectively account for half of the reactive

    更新日期:2021-01-12
  • Hindcasting multidecadal predevelopment groundwater levels in the Floridan aquifer
    Groundwater (IF 2.205) Pub Date : 2021-01-08
    Fatih Gordu; Mahmood H. Nachabe

    Establishing predevelopment benchmark groundwater conditions is challenging without long‐term records to discern impacts of pumping and climate change on aquifer levels. Understanding periodic natural cycles and trends require 100 years or more data which rarely exist. Using limited records, we develop an approach to hindcast multidecadal levels and examine the temporal evolution of climatic and pumping

    更新日期:2021-01-08
  • Multiple Wavelet Coherence to Evaluate Local Multivariate Relationships in a Groundwater System
    Groundwater (IF 2.205) Pub Date : 2020-12-19
    Xiufen Gu; HongGuang Sun; Yong Zhang; Zhongbo Yu; Jianting Zhu

    Groundwater level fluctuations are affected by surface properties due to complex correlations of groundwater‐surface water interaction and/or other surface processes, which are usually hard to be accurately quantified. Previous studies have assessed the relationship between groundwater level fluctuations and specific controlling factors. However, few studies have been conducted to explore the impact

    更新日期:2021-01-08
  • Interpretation of Pumping Tests in Heterogeneous Aquifers with Constant Head Boundary
    Groundwater (IF 2.205) Pub Date : 2021-01-02
    Armin Pechstein; Nadim K. Copty

    This paper investigates the impact of heterogeneity of the transmissvity field on the interpretation of steady‐state pumping test data from aquifer systems delimited by constant head boundaries such as aquifers adjacent to lakes or rivers. Spatially variable transmissivity fields are randomly generated and used to simulate the drawdown due to a pumping well located at different distances from a constant

    更新日期:2021-01-03
  • Machine Learning Predictions of pH in the Glacial Aquifer System, Northern USA
    Groundwater (IF 2.205) Pub Date : 2020-12-11
    Paul E. Stackelberg; Kenneth Belitz; Craig J. Brown; Melinda L. Erickson; Sarah M. Elliott; Leon J. Kauffman; Katherine M. Ransom; James E. Reddy

    A boosted regression tree model was developed to predict pH conditions in three dimensions throughout the glacial aquifer system of the contiguous United States using pH measurements in samples from 18,386 wells and predictor variables that represent aspects of the hydrogeologic setting. Model results indicate that the carbonate content of soils and aquifer materials strongly controls pH and, when

    更新日期:2020-12-31
  • Nitrogen Attenuation in Septic System Plumes
    Groundwater (IF 2.205) Pub Date : 2020-12-12
    William D. Robertson; Dale R. Van Stempvoort; Sherry L. Schiff

    The persistence of inorganic nitrogen is assessed in a set of 21 septic system plumes located in Ontario, Canada, that were studied over a 31‐year period from 1988 to 2019. In the plume zones underlying the drainfields, site mean NO3− values averaged 34 ± 27 mg N/L and exceeded the nitrate drinking water limit (DWL) of 10 mg N/L at 16 of 21 sites. In plume zones extending up to 30 m downgradient from

    更新日期:2020-12-30
  • Flowing Well—Time‐Domain Solution and Inverse Problem Revisited
    Groundwater (IF 2.205) Pub Date : 2020-12-12
    Tomas Perina

    Time‐domain analytical solution for groundwater flow to a fully penetrating flowing well is derived using the same substitution technique used to re‐derive (Perina 2010) the Theis (1935) equation and the approximate solution by Mishra and Guyonnet (1992) is confirmed. The exponential integral‐based flowing well function is a computationally effective alternative to the original Jacob and Lohman (1952)

    更新日期:2020-12-29
  • The Effects of Fault‐Zone Cementation on Groundwater Flow at the Field Scale
    Groundwater (IF 2.205) Pub Date : 2020-12-11
    Tyler G. Sproule; Glenn A. Spinelli; John L. Wilson; Michael D. Fort; Peter S. Mozley; Jared Ciarico

    Fault zones are an important control on fluid flow, affecting groundwater supply, contaminant migration, and carbon storage. However, most models of fault seal do not consider fault zone cementation, despite the recognition that it is common and can dramatically reduce permeability. In order to study the field‐scale hydrogeologic effects of fault zone cementation, we conducted a series of aquifer pumping

    更新日期:2020-12-24
  • A Dye Tracer Approach for Quantifying Fluid and Solute Flux Across the Sediment–Water Interface
    Groundwater (IF 2.205) Pub Date : 2020-12-06
    Ryan N. Cascarano; Donald M. Reeves; Mark A. Henry
    更新日期:2020-12-17
  • Reducing Groundwater Pumping Cost Using Alternate Pulsed Pumping
    Groundwater (IF 2.205) Pub Date : 2020-12-06
    Nikolaos Nagkoulis

    This paper deals with water pumping cost minimization, in a confined infinite aquifer, proposing an alternate pulsed pumping schedule. The transient flow analysis is conducted for two wells with equal pumping rates. Specifically, two pumping schedules are analytically compared. In the first case, well users pump simultaneously, and in the second one they cooperate so that they pump alternately. This

    更新日期:2020-12-17
  • Edmond Halley's Contributions to Hydrogeology
    Groundwater (IF 2.205) Pub Date : 2020-11-20
    David Deming

    The nature of the hydrologic cycle is one of the oldest and most important questions in geology (Deming 2005, 2014, 2018). The mystery was how the water balance between oceanic, terrestrial, and atmospheric waters was maintained. As Edmond Halley (Figure 1) himself noted, over the course of recorded human history “the sea has not sensibly decreased by the loss in vapor; nor yet abounded by the immense

    更新日期:2020-12-02
  • Unsaturated Zone Flow Processes and Aquifer Response Time in the Chalk Aquifer, Brighton, South East England
    Groundwater (IF 2.205) Pub Date : 2020-10-21
    Peshawa Al‐Jaf; Martin Smith; Friederike Gunzel

    The Chalk aquifer is one of the main sources of water in South East England. The unsaturated zone in the aquifer plays an important role controlling the time and magnitude of recharge and is major pathway for contaminant transport to the water table. A range of previous work has addressed flow processes in the Chalk unsaturated zone, but physical understanding is still incomplete. Here we present the

    更新日期:2020-11-25
  • The Bioavailability of Dissolved, Particulate, and Adsorbed Organic Carbon in Groundwater Systems
    Groundwater (IF 2.205) Pub Date : 2020-10-26
    Francis H. Chapelle

    Dissolved organic carbon (DOC) is the smallest amount of organic carbon present in aquifer systems and is typically dwarfed by amounts of particulate organic carbon (POC) and adsorbed organic carbon (AOC). Research conducted over the last half century, however, has shown that these dissolved, particulate, and adsorbed compartments interact dynamically with each other. That suggests the hypothesis that

    更新日期:2020-11-12
  • No-Purge Groundwater Sampling for PFAS.
    Groundwater (IF 2.205) Pub Date : 2020-09-09
    Melissa Armstrong,Matthew J Seitz,Fern Beetle-Moorcroft,David S Lipson

    Article impact statement: A no‐purge groundwater sampling method for PFAS using disposable bailers is demonstrated to be effective to a 95% degree of confidence.

    更新日期:2020-11-06
  • Constraining a Flow Model with Field Measurements to Assess Water Transit Time Through a Vadose Zone
    Groundwater (IF 2.205) Pub Date : 2020-10-21
    Lamine Boumaiza; Romain Chesnaux; Julien Walter; Christine Stumpp

    The modeling of thick vadose zones is particularly challenging because of difficulties in collecting a variety of measured sediment properties, which are required for parameterizing the model. Some models rely on synthetic data, whereas others are simplified by running as homogeneous sediment domains and relying on a single set of sediment properties. Few studies have simulated flow processes through

    更新日期:2020-11-04
  • On the Performance of Pilot‐Point Based Hydraulic Tomography with a Geophysical a Priori Model
    Groundwater (IF 2.205) Pub Date : 2020-09-29
    Sarada Poduri; B.V.N.P. Kambhammettu

    We present a novel method to estimate the hydraulic and storage properties of a heterogeneous aquifer system using pilot‐point‐based hydraulic tomography (HT) inversion in conjunction with a geophysical a priori model. The a priori model involved a soil stratification obtained by combining electrical resistivity tomography inversion and field data from hydrogeological experiments. Pilot‐point densities

    更新日期:2020-10-11
  • Review of Laboratory Scale Models of Karst Aquifers: Approaches, Similitude, and Requirements
    Groundwater (IF 2.205) Pub Date : 2020-09-26
    Zargham Mohammadi; Walter A. Illman; Malcolm Field

    This review focuses on investigations of groundwater flow and solute transport in karst aquifers through laboratory scale models (LSMs). In particular, LSMs have been used to generate new data under different hydraulic and contaminant transport conditions, testing of new approaches for site characterization, and providing new insights into flow and transport processes through complex karst aquifers

    更新日期:2020-10-11
  • Hydrogeochemistry of Water in Coal Measures During Grouting Treatment of Taoyuan Mine, China.
    Groundwater (IF 2.205) Pub Date : 2020-08-11
    Yan Guo,Jiuchuan Wei,Herong Gui,Zhi Zhang,Mancong Hu,Pei Fang,Guangping Li,Chuan Gao,Xin Wang

    Permian coal measure sandstone fissure water (referred to as “coal measure water,” that is, water in coal measures) is one of the important water sources for industrial and agricultural activities in mining areas. However, the regional high‐pressure grouting, one of the most widely used floor control methods, may affect the coal measure water which is connected with limestone aquifer. This study used

    更新日期:2020-10-05
  • anem: A simple web-based platform to build stakeholder understanding of groundwater behavior.
    Groundwater (IF 2.205) Pub Date : 2020-08-28
    Gopal Penny,Connor Mullen,Diogo Bolster,Bruce Huber,Marc Müller

    Groundwater supports essential societal and ecological functions by acting as a reservoir that buffers against natural variability. Increasing water scarcity and climate variability have resulted in more intensive management of groundwater resources, but groundwater often remains difficult to understand and manage. With this in mind, we develop a simple platform that provides a straightforward, web‐based

    更新日期:2020-09-30
  • Groundwater Plans in the United States: Regulatory Frameworks and Management Goals.
    Groundwater (IF 2.205) Pub Date : 2020-09-09
    Allison Gage,Anita Milman

    Groundwater management plans are an important tool for preventing and addressing degradation and depletion of the resource. Through plans, water users and regulators set forth goals and identify strategies to address the needs of multiple resource users while considering physical constraints of the groundwater resource. This research examines the status of groundwater management plans in the United

    更新日期:2020-09-25
  • Applying a Regional Transport Modeling Framework to Manage Nitrate Contamination of Groundwater.
    Groundwater (IF 2.205) Pub Date : 2020-09-05
    Lihong Yang,Chunmiao Zheng,Charles B Andrews,Chengjian Wang

    Regional nitrate contamination in groundwater is a management challenge involving multisector benefits. There is always conflict between restricting anthropogenic activities to protect groundwater quality and prioritizing economic development, especially in productive agriculture dominated areas. To mitigate the nitrate contamination in groundwater, it is necessary to develop management alternatives

    更新日期:2020-09-22
  • Advantages of the Optimum Pulse Moment in Surface NMR and Application in Groundwater Exploration.
    Groundwater (IF 2.205) Pub Date : 2020-09-05
    Jianwei Pan,Kai Lu,Zhongmei Wang,Kaitian Li,Zhenyu Li

    The surface nuclear magnetic resonance (SNMR) method is widely used in groundwater detection because of its sensitivity to hydrogen in water and direct water detection. However, low signal‐to‐noise ratios (SNRs) restrict the development of this technique. An optimum pulse sequence is designed according to correspondence between the pulse moment strength and its best detection depth. Because only selection

    更新日期:2020-09-20
  • Source and Quality of Groundwater Surrounding the Qinghai Lake, NE Qinghai-Tibet Plateau.
    Groundwater (IF 2.205) Pub Date : 2020-08-25
    Dong-Sheng Li,Bu-Li Cui,Ying Wang,Ya-Xuan Wang,Bao-Fu Jiang

    Comprehensive studies on the spatial distribution, water quality, recharge source, and hydrochemical evolution of regional groundwater form the foundation of rational utilization of groundwater resources. In this study, we investigated the water levels, hydrochemistry, and stable isotope composition of groundwater in the vicinity of the Qinghai Lake in China to reveal its recharge sources, hydrochemical

    更新日期:2020-09-11
  • Modeling and Mapping High Water Table for a Coastal Region in Florida using Lidar DEM Data.
    Groundwater (IF 2.205) Pub Date : 2020-08-17
    Caiyun Zhang,Hongbo Su,Tiantian Li,Weibo Liu,Diana Mitsova,Sudhagar Nagarajan,Ramesh Teegavarapu,Zhixiao Xie,Fred Bloetscher,Yan Yong

    Predicting and mapping high water table elevation in coastal landscapes is critical for both science application projects like inundation risk analysis and engineering projects like pond design and maintenance. Previous studies of water table mapping focused on the application of geostatistical methods, which cannot predict values beyond an observation spatial domain or generate an ideal pattern for

    更新日期:2020-09-10
  • A Physically Based Approach for Estimating Hydraulic Conductivity from HPT Pressure and Flowrate.
    Groundwater (IF 2.205) Pub Date : 2020-08-17
    Robert C Borden,Ki Young Cha,Gaisheng Liu

    The hydraulic profiling tool (HPT) is widely used to generate profiles of relative permeability vs. depth. In this work, prior numerical modeling results are used to develop a relationship between probe advance rate V (cm/s), probe diameter D (cm), water injection rate Q (mL/min), corrected pressure Pc (psi), and hydraulic conductivity K (feet/d) (1)where E is an empirically derived hydraulic efficiency

    更新日期:2020-09-08
  • Upstream Dispersion in Solute Transport Models: A Simple Evaluation and Reduction Methodology.
    Groundwater (IF 2.205) Pub Date : 2020-08-04
    D J Irvine,A D Werner,Y Ye,A Jazayeri

    This article outlines analytical solutions to quantify the length scale associated with “upstream dispersion,” the artificial movement of solutes in the opposite direction to groundwater flow, in solute transport models. Upstream dispersion is an unwanted artifact in common applications of the advection‐dispersion equation (ADE) in problems involving groundwater flow in the direction of increasing

    更新日期:2020-08-20
  • Simulation of Lake-Groundwater Interaction under Steady-State Flow.
    Groundwater (IF 2.205) Pub Date : 2020-07-22
    Chuiyu Lu,Bo Zhang,Xin He,Guoliang Cao,Qingyan Sun,Lingjia Yan,Tao Qin,Tianchen Li,Zepeng Li

    MODFLOW is one of the most popular groundwater simulation tools available; however, the development of lake modules that can be coupled with MODFLOW is lacking apart from the LAK3 package. This study proposes a new approach for simulating lake‐groundwater interaction under steady‐state flow, referred to as the sloping lakebed method (SLM). In this new approach, discretization of the lakebed in the

    更新日期:2020-08-17
  • Chemistry of the Karst Sarabkalan Spring, Iran, and Controls of PDO and ENSO Climate Indices on It.
    Groundwater (IF 2.205) Pub Date : 2020-07-25
    Abolfazl Rezaei

    The Sarabkalan Spring serves as a primary water supply to irrigation and domestic use in the Sirvan Region, Iran. As it has a highly variable discharge, understanding its teleconnections with large‐scale climate variability is crucial. In this study, we first characterize the springshed and its corresponding karst aquifer system using genetic algorithm analysis on the spring discharge, water balance

    更新日期:2020-08-14
  • A Method to Represent a Well in a Three-Dimensional Discrete Fracture Network Model.
    Groundwater (IF 2.205) Pub Date : 2020-07-06
    Hai Pham,Rishi Parashar,Nicole Sund,Karl Pohlmann

    In discrete fracture network (DFN) modeling, fractures are randomly generated and placed in the model domain. The rock matrix is considered impermeable. Small fractures and isolated fractures are often ignored to reduce computational expense. As a result, the rock matrix between fractures could be large and intersections may not be found between a well introduced in the model and the hydraulically

    更新日期:2020-07-31
  • Fault seal analysis in an onshore unconventional gas target, North Perth Basin.
    Groundwater (IF 2.205) Pub Date : 2020-06-29
    F Mullen,R Archer,G Yielding,H Boogaerdt

    During the 1980s, hydrocarbons were logged in aquifers during drilling of conventional gas wells in the Woodada gasfield. The gasfield is located in the North Perth Basin in Western Australia. Using Fault Seal Analysis Technology, our goal was to test the hypothesis that faults in the Kockatea Shale that are currently being reactivated may be leak prone. Wells proximal to faults with a fracture stability

    更新日期:2020-07-23
  • Coastal Resiliency Groundwater Considerations.
    Groundwater (IF 2.205) Pub Date : 2020-07-23
    Daniel J Rozell

    The potential for rising groundwater is an important consideration in any coastal resiliency assessment. Unlike other groundwater modeling that focuses mostly on contaminant tracking, coastal groundwater resiliency assessments are primarily concerned with the potential for groundwater emergence induced by sea level rise. This provides more options for modelers that range from simplified water table

    更新日期:2020-07-23
  • Unstructured Gridding for MODFLOW from Prior Groundwater Flow Models: A New Paradigm.
    Groundwater (IF 2.205) Pub Date : 2020-07-13
    M Adil Sbai

    This work introduces a new unstructured gridding approach relying on feedback from a previous groundwater flow model. All cells in a relatively coarse model using a rectilinear grid are recursively subdivided following a cell wise specific discharge‐based indicator to generate quadtree, octree or Voronoï grids. This technique leverages the full potential of the latest MODFLOW engines. The suitability

    更新日期:2020-07-13
  • Parallel Simulation in Subsurface Hydrology: Evaluating the Performance of Modeling Computers.
    Groundwater (IF 2.205) Pub Date : 2020-06-12
    Theo S Sarris,David M Scott,Murray E Close

    Monte Carlo uncertainty analysis, model calibration and optimization applications in hydrology, usually involve a very large number of forward transient model solutions, often resulting in computational bottlenecks. Parallel processing can significantly reduce overall simulation time, benefiting from the architecture of modern computers. This work investigates system performance using two realistic

    更新日期:2020-07-08
  • Modeling Groundwater Inflow to the New Crater Lake at Kīlauea Volcano, Hawai'i.
    Groundwater (IF 2.205) Pub Date : 2020-06-08
    S E Ingebritsen,A F Flinders,J P Kauahikaua,P A Hsieh

    During the 2018 eruption of Kīlauea Volcano, Hawai'i, scientists relied heavily on a conceptual model of explosive eruptions triggered when lava‐lake levels drop below the water table. Numerical modeling of multiphase groundwater flow and heat transport revealed that, contrary to expectations, liquid water inflow to the drained magma conduit would likely be delayed by months to years, owing to the

    更新日期:2020-06-29
  • Use of Groundwater Level Fluctuations near an Operating Water Supply Well to Estimate Aquifer Transmissivity.
    Groundwater (IF 2.205) Pub Date : 2020-05-20
    Sergey Pozdniakov,Pavel Ivanov,Paul Davis,Nikolay Sizov

    We developed a method to estimate aquifer transmissivity from the hydraulic‐head data associated with the normal cyclic operation of a water supply well thus avoiding the need for interrupting the water supply associated with a traditional aquifer test. The method is based on an analytical solution that relates the aquifer's transmissivity to the standard deviation of the hydraulic‐head fluctuations

    更新日期:2020-06-26
  • Recommended Sampling Intervals for Arsenic in Private Wells.
    Groundwater (IF 2.205) Pub Date : 2020-06-02
    Brian J Mailloux,Nicholas A Procopio,Mark Bakker,Therese Chen,Imtiaz Choudhury,Kazi Matin Ahmed,M Rajib H Mozumder,Tyler Ellis,Steve Chillrud,Alexander van Geen

    Geogenic arsenic in drinking water is a worldwide problem. For private well owners, testing (e.g., private or government laboratory) is the main method to determine arsenic concentration. However, the temporal variability of arsenic concentrations is not well characterized and it is not clear how often private wells should be tested. To answer this question, three datasets, two new and one publicly

    更新日期:2020-06-19
  • An Application of HFE-D for Evaluating Sea Water Intrusion in Coastal Aquifers of Southern Vietnam.
    Groundwater (IF 2.205) Pub Date : 2020-06-05
    Thi Thuy Van Le,Rungruang Lertsirivorakul,Tran Vuong Bui,Marcia K Schulmeister

    The coastal aquifers and inland waters of the Long Xuyen Quadrangle and Ca Mau Peninsula of southern Vietnam have been significantly impacted by sea water intrusion (SI) as a result of recent anthropogenic activities. This study identified the evolution and spatial distribution of hydrochemical conditions in coastal aquifers at this region using Hydrochemical Facies Evolution Diagram (HFE‐D) and Geographical

    更新日期:2020-06-05
  • Are Groundwater Level Data Collected by Citizen Scientists Trustworthy? A Cautionary Tale.
    Groundwater (IF 2.205) Pub Date : 2020-05-24
    Alex K Manda,J Randall Etheridge,Cynthia Grace-McCaskey,Thomas R Allen,Robert Howard

    Public participation in groundwater projects is increasing, however, the efficacy of the data collected in such studies, is not well‐documented in the literature. In this study, the authors describe a citizen science project focused on measuring and recording groundwater levels in an aquifer and evaluate whether the groundwater data collected by the participants are trustworthy. A total of 31 participants

    更新日期:2020-05-24
  • On Solving Groundwater Flow and Transport Models with Algebraic Multigrid Preconditioning.
    Groundwater (IF 2.205) Pub Date : 2020-05-20
    M Adil Sbai,A Larabi

    Iterative solvers preconditioned with algebraic multigrid have been devised as an optimal technology to speed up the response of large sparse linear systems. In this work, this technique was implemented in the framework of the dual delineation approach. This involves a single groundwater flow linear solution and a pure advective transport solution with different right-hand sides. The new solver was

    更新日期:2020-05-20
  • ogs5py: A Python-API for the OpenGeoSys 5 Scientific Modeling Package.
    Groundwater (IF 2.205) Pub Date : 2020-05-20
    Sebastian Müller,Alraune Zech,Falk Heße

    High‐performance numerical codes are an indispensable tool for hydrogeologists when modeling subsurface flow and transport systems. But as they are written in compiled languages, like C/C++ or Fortran, established software packages are rarely user‐friendly, limiting a wider adoption of such tools. OpenGeoSys (OGS), an open‐source, finite‐element solver for thermo‐hydro‐mechanical–chemical processes

    更新日期:2020-05-20
  • Fracture Flow Characterization with Low-Noise Spontaneous Potential Logging.
    Groundwater (IF 2.205) Pub Date : 2020-04-19
    André C G Kowalski,Carlos A Mendonça,Ulrich S Ofterdinger

    Geophysical well logging has been applied for fracture characterization in crystalline terrains by physical properties measurements and borehole wall imaging. Some of these methods can be applied to monitor pumping tests to identify fractures contributing to groundwater flow and, with this, determine hydraulic conductivity and transmissivity along the well. We present a procedure to identify fractures

    更新日期:2020-05-11
  • Assessment of NMR Logging for Estimating Hydraulic Conductivity in Glacial Aquifers.
    Groundwater (IF 2.205) Pub Date : 2020-05-10
    Alexander K Kendrick,Rosemary Knight,Carole D Johnson,Gaisheng Liu,Steven Knobbe,Randall J Hunt,James J Butler

    Glacial aquifers are an important source of groundwater in the United States and require accurate characterization to make informed management decisions. One parameter that is crucial for understanding the movement of groundwater is hydraulic conductivity, K . Nuclear magnetic resonance (NMR) logging measures the NMR response associated with the water in geological materials. By utilizing an external

    更新日期:2020-05-10
  • Field Tracer Tests to Evaluate Transport Properties of Tryptophan and Humic Acid in Karst.
    Groundwater (IF 2.205) Pub Date : 2020-05-10
    Simon Frank,Nadine Goeppert,Nico Goldscheider

    The monitoring of water quality, especially of karst springs, requires methods for rapidly estimating and quantifying parameters that indicate contamination. In the last few years, fluorescence-based measurements of tryptophan and humic acid have become a promising tool to assess water quality in near real-time. In this study, we conducted comparative tracer tests in a karst experimental site to investigate

    更新日期:2020-05-10
  • Are Visible Fractures Accurate Predictors of Flow and Mass Transport in Fractured Till?
    Groundwater (IF 2.205) Pub Date : 2020-05-09
    Nathan L Young,William W Simpkins,Robert Horton

    Tracer experiments conducted in the laboratory on undisturbed core samples (<7.3-cm-diameter) have been a standard method for estimating hydraulic and transport properties of fractured till since the 1980s. This study assesses the relationship between visible fractures on the top and bottom of core samples and the resulting hydraulic and mass transport properties of the core. We hypothesized that more

    更新日期:2020-05-09
  • Using Wavelet Coherence to Characterize Surface Water Infiltration into a Low-Lying Karst Aquifer.
    Groundwater (IF 2.205) Pub Date : 2020-05-09
    Philip Schuler,Èlia Cantoni,Léa Duran,Paul Johnston,Laurence Gill

    Karstified carbonate aquifers may receive significant recharge contributions from losing streams, hence, the knowledge about surface water-groundwater (SW-GW) interactions is crucial with regard to water management (e.g., source protection zone delineation). The dynamics of SW-GW interactions may depend on factors such as the relative water levels between streams and aquifers, resulting in a temporal

    更新日期:2020-05-09
  • The Enrichment Process of Groundwater Fluorine in Seawater Intrusion Area of Gaomi City, China
    Groundwater (IF 2.205) Pub Date : 2020-03-11
    Qiao Chen; Decheng Hao; Zongjun Gao; Mengjie Shi; Min Wang; Jianguo Feng; Qinghai Deng; Lu Xia; Chunrong Zhang; Yongbo Yu

    A typical area, Gaomi City in China, was chosen to discuss the enrichment process of groundwater fluorine in seawater intrusion area. The groundwater had fluorine levels of 0.09–10.99 mg/L, with an average concentration of 1.38 mg/L. The high‐fluorine groundwater was mainly distributed in the unconsolidated Quaternary sediments, where concentrations in 83.6% of the samples exceeded the national limit

    更新日期:2020-04-22
  • Erratum
    Groundwater (IF 2.205) Pub Date : 2020-04-22

    Mills, A. 2020. Comparison of two computational methods for estimating transmissivity based on the picking equation. Groundwater (this issue). After the manuscript was approved for publication in Groundwater, I continued testing one of the two programs discussed in the paper (PPC‐Recovery). I found an error in the code that involved switching rw for rc in one equation, where rw is the radius of the

    更新日期:2020-04-22
  • Distributed Temperature Sensing to Measure Infiltration Rates Across a Groundwater Recharge Basin.
    Groundwater (IF 2.205) Pub Date : 2020-04-14
    Ricardo Medina,Christine Pham,Megan H Plumlee,Adam Hutchinson,Matthew W Becker,Patrick J O'Connell

    Managed aquifer recharge is used to augment groundwater resources and provide resiliency to water supplies threatened by prolonged droughts. It is important that recharge facilities operate at their maximum efficiency to increase the volume of water stored for future use. In this study, we evaluate the use of distributed temperature sensing (DTS) technology as a tool to measure high‐resolution infiltration

    更新日期:2020-04-14
  • Spatiotemporal Analysis of Extracted Groundwater Volumes Estimated from Electricity Consumption.
    Groundwater (IF 2.205) Pub Date : 2020-04-14
    Hone-Jay Chu,Cheng-Wei Lin,Thomas J Burbey,Muhammad Zeeshan Ali

    Land subsidence caused by groundwater overexploitation is a serious global problem. The acquisition of spatiotemporal pumping rates and volumes is a first step for water managers to develop a strategic plan for mitigating land subsidence. This study investigates an empirical formulation to estimate the monthly maximum pumped volume over a 10‐year period based on electric power consumption data. A spatiotemporal

    更新日期:2020-04-14
  • Using Generative Adversarial Networks as a Fast Forward Operator for Hydrogeological Inverse Problems.
    Groundwater (IF 2.205) Pub Date : 2020-04-13
    Yasin Dagasan,Przemysław Juda,Philippe Renard

    Subsurface characterization using inverse techniques constitutes one of the fundamental elements of hydrogeological modeling applications. Available methods to solve inverse problems rely on a forward operator that predicts state variables for a given set of subsurface parameters. As the number of model parameters to be estimated increases, forward operations incur a significant computational demand

    更新日期:2020-04-13
  • Integrated Hydrologic Modeling to Untangle the Impacts of Water Management During Drought
    Groundwater (IF 2.205) Pub Date : 2020-04-11
    Lauren M. Thatch, James M. Gilbert, Reed M. Maxwell

    Over the past century, groundwater levels in California's San Joaquin Valley have dropped by more than 30 m in some areas mostly due to excessive groundwater extraction used to irrigate agricultural lands and sustain a growing population. Between 2012 and 2015, California experienced the worst drought in its recorded history, depleting surface water supplies and further exacerbating groundwater depletion

    更新日期:2020-04-11
  • Improved Parameter Resolution with Markov Chain Monte Carlo Simulation of Different Aquifer Tests.
    Groundwater (IF 2.205) Pub Date : 2020-04-08
    Tomas Perina

    Hydraulic testing for aquifer characterization at contaminated sites often includes tests of short duration and of different types, such as slug tests and pumping tests, conducted at different phases of investigation. Tests conducted on a well cluster installed in a single aquifer can be combined in aggregate inverse analysis using an analytical model for groundwater flow near a test well. A genetic

    更新日期:2020-04-08
  • Simulating Groundwater-Streamflow Connections in the Upper Colorado River Basin.
    Groundwater (IF 2.205) Pub Date : 2020-04-03
    Hoang Tran,Jun Zhang,Jean-Martial Cohard,Laura E Condon,Reed M Maxwell

    In mountain, snow driven catchments, snowmelt is supposed to be the primary contribution to river streamflows during spring. In these catchments the contribution of groundwater is not well documented because of the difficulty to monitor groundwater in such complex environment with deep aquifers. In this study we use an integrated hydrologic model to conduct numerical experiments that help quantify

    更新日期:2020-04-03
  • Importance of Spatial Resolution in Global Groundwater Modeling
    Groundwater (IF 2.205) Pub Date : 2020-03-31
    Robert Reinecke, Alexander Wachholz, Steffen Mehl, Laura Foglia, Christoph Niemann, Petra Döll

    Global‐scale gradient‐based groundwater models are a new endeavor for hydrologists who wish to improve global hydrological models (GHMs). In particular, the integration of such groundwater models into GHMs improves the simulation of water flows between surface water and groundwater and of capillary rise and thus evapotranspiration. Currently, these models are not able to simulate water table depth

    更新日期:2020-03-31
  • A Flux Detection Probe to Quantify Dynamic Groundwater‐Surface Water Exchange in the Hyporheic Zone
    Groundwater (IF 2.205) Pub Date : 2020-03-28
    Jonathan Thomle; Chris Strickland; Tim C. Johnson; Yue Zhu; James Stegen

    A new probe was designed to quantify groundwater‐surface water exchange in the hyporheic zone under dynamic stage condition. Current methods focus on either vertical pore water velocity or Darcy flux measurements. Both parameters must be understood to evaluate residence time and mass flux of constituents. Furthermore, most instruments are not well suited for monitoring instantaneous velocity or flux

    更新日期:2020-03-28
  • DISOLV: A Python Package for the Interpretation of Borehole Dilution Tests
    Groundwater (IF 2.205) Pub Date : 2020-03-27
    Sarah L. Collins, Marco Bianchi

    Single borehole dilution tests (SBDTs) are an inexpensive but effective technique for hydrogeological characterization of hard‐rock aquifers. We present a freely available, easy‐to‐use, open‐source Python package, DISOLV, for plotting, analyzing, and modeling SBDT data. DISOLV can significantly reduce the time spent interpreting field data by helping to identify flowing fractures intersecting the borehole

    更新日期:2020-03-27
  • The Enrichment Process of Groundwater Fluorine in Sea Water Intrusion Area of Gaomi City, China
    Groundwater (IF 2.205) Pub Date : 2020-03-06
    Qiao Chen; Decheng Hao; Zongjun Gao; Mengjie Shi; Min Wang; Jianguo Feng; Qinghai Deng; Lu Xia; Chunrong Zhang; Yongbo Yu

    A typical area, Gaomi City in China, was chosen to discuss the enrichment process of groundwater fluorine in sea water intrusion area. The groundwater had fluorine levels of 0.09–10.99 mg/L, with an average concentration of 1.38 mg/L. The high‐fluorine groundwater was mainly distributed in the unconsolidated Quaternary sediments, where concentrations in 83.6% of the samples exceeded the national limit

    更新日期:2020-03-06
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