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1. Optimal remediation design and simulation of groundwater flow coupled to contaminant transport using genetic algorithm and radial point collocation method (RPCM)

Author:
Seyedpour, S.M.; Kirmizakis, P.; Brennan, P.; Doherty, R.; Ricken, T.
Source:
The Science of the total environment 2019 v.669 pp. 389-399
ISSN:
0048-9697
Subject:
groundwater; groundwater flow,   etc   ; algorithms; models; oxidants; remediation;     Show all 6 Subjects
Abstract:
... The simulation-optimisation models of groundwater and contaminant transport can be a powerful tool in the management of groundwater resources and remediation design. In this study, using Multiquadratic Radial Basis Function (MRBF) a coupled groundwater flow and reactive transport of contaminant and oxidant was developed in the framework of the Meshfree method. The parameter analysis has determined ...
DOI:
10.1016/j.scitotenv.2019.01.409

2. Hydrogeological conceptual model building and testing: A review

Author:
Enemark, Trine; Peeters, Luk J.M.; Mallants, Dirk; Batelaan, Okke
Source:
Journal of hydrology 2019 v.569 pp. 310-329
ISSN:
0022-1694
Subject:
groundwater; groundwater flow,   etc   ; guidelines; models; prediction; uncertainty;     Show all 6 Subjects
Abstract:
... Hydrogeological conceptual models are collections of hypotheses describing the understanding of groundwater systems and they are considered one of the major sources of uncertainty in groundwater flow and transport modelling. A common method for characterizing the conceptual uncertainty is the multi-model approach, where alternative plausible conceptual models are developed and evaluated. This revi ...
DOI:
10.1016/j.jhydrol.2018.12.007

3. Response of Triangular-Shaped Leaky Aquifers to Rainfall-Induced Groundwater Recharge: an Analytical Study

Author:
Mahdavi, Ali
Source:
Water resources management 2019 v.33 no.6 pp. 2153-2173
ISSN:
0920-4741
Subject:
groundwater; groundwater recharge,   etc   ; aquifers; equations; finite element analysis; isotropy; streams;     Show all 7 Subjects
Abstract:
... Different aspects of groundwater mound dynamics in triangular-shaped aquifers are investigated analytically under spatially uniform recharge of time-varying rate. The aquifer response is analyzed relying on 2-D linearized Boussinesq equation, subject to two different configurations of hydrogeological boundary conditions (constant-head streams and no-flow barrier). The aquifer is homogeneous, isotr ...
DOI:
10.1007/s11269-019-02234-7

4. Accurate approximate semi-analytical solutions to the Boussinesq groundwater flow equation for recharging and discharging of horizontal unconfined aquifers

Author:
Hayek, Mohamed
Source:
Journal of hydrology 2019 v.570 pp. 411-422
ISSN:
0022-1694
Subject:
groundwater; groundwater flow,   etc   ; dewatering; equations; streams; unconfined aquifer; water table;     Show all 7 Subjects
Abstract:
... The Boussinesq equation is usually used to describe one-dimensional unconfined groundwater movement. Solutions of this equation are important as they provide useful insights regarding the water table response to stream level variations and allow us to quantify the exchange flow between the stream and the aquifer. Due to the nonlinearity of the Boussinesq equation, the solutions are generally obtai ...
DOI:
10.1016/j.jhydrol.2018.12.057

5. An assessment of the replicability of a standard and modified sanitary risk protocol for groundwater sources in Greater Accra

Author:
Yentumi, W.; Dzodzomenyo, M.; Sashie-Doe, K.; Wright, J.
Source:
Environmental monitoring and assessment 2019 v.191 no.2 pp. 59
ISSN:
0167-6369
Subject:
groundwater; groundwater contamination,   etc   ; pipes; protocols; risk; sewage; surveys; wells; Ghana;     Show all 9 Subjects
Abstract:
... Sanitary risk inspection, the systematic observation of contamination hazards, is often used to manage safety of water sources such as wells and boreholes. However, the replicability of sanitary risk inspections undertaken by different observers has not been studied. This study aimed to assess the replicability of sanitary risk inspections by two different observers in urban and peri-urban neighbo ...
DOI:
10.1007/s10661-018-7174-5

6. A semi-analytical solution for groundwater flow-field delineation near pumping/injection wells in confined aquifers

Author:
Bica, Ioan; Boukhemacha, Mohamed Amine; Groza, Ghiocel
Source:
Hydrogeology journal 2019 v.27 no.1 pp. 61-71
ISSN:
1431-2174
Subject:
groundwater; groundwater flow,   etc   ; confined aquifer; isotropy; mathematical models; remediation; wells;     Show all 7 Subjects
Abstract:
... A new semi-analytical solution to study groundwater flow fields associated with pumping or injection wells in confined isotropic aquifers with uniform regional flow is proposed and tested against steady-state and transient-state numerical simulations on MODFLOW-MODPATH. The solution is based on the complex potential theory and can be used for large numbers of arbitrarily positioned wells operated ...
DOI:
10.1007/s10040-018-1869-0

7. Latest development of radiokrypton dating – A tool to find and study paleogroundwater

Author:
Jiang, Wei; Hu, Shui-Ming; Lu, Zheng-Tian; Ritterbusch, Florian; Yang, Guo-min
Source:
Quaternary international 2019
ISSN:
1040-6182
Subject:
groundwater,   etc   ; aquifers; paleoclimatology; water management;     Show all 4 Subjects
Abstract:
... The study of paleogroundwater on a timescale of several thousands to a million years is interesting both in terms of understanding the aquifer system itself and water resource management. It may also provide valuable information about the paleoclimate. In their seminal work, Loosli and Oeschger (1969) identified 81Kr as an ideal age tracer for paleogroundwater up to one million years old. Since th ...
DOI:
10.1016/j.quaint.2019.04.025

8. Your work is my boundary condition!

Author:
Staudinger, Maria; Stoelzle, Michael; Cochand, Fabien; Seibert, Jan; Weiler, Markus; Hunkeler, Daniel
Source:
Journal of hydrology 2019 v.571 pp. 235-243
ISSN:
0022-1694
Subject:
groundwater,   etc   ; models; surface water; watersheds;     Show all 4 Subjects
Abstract:
... Hydrologists and hydrogeologists both study the flux and storage of water with the numerous interactions and feedback mechanisms of surface water and groundwater. Traditionally however, focus, models and scales of the studies differ. In this commentary, situations are illustrated where boundary conditions that each discipline assumes, preserves and actively uses, can and have to be overcome. These ...
DOI:
10.1016/j.jhydrol.2019.01.058

9. Large deformation of tunnels in longwall coal mines

Author:
Wang, Meng; Zheng, Dongjie; Niu, Shuangjian; Li, Wenfeng
Source:
Environmental earth sciences 2019 v.78 no.2 pp. 45
ISSN:
1866-6280
Subject:
groundwater,   etc   ; coal; deformation; engineering; models;     Show all 5 Subjects
Abstract:
... Large deformation of tunnels in longwall coal mines creates massive cracks in the surrounding rocks, which may cause groundwater loss and threaten the coal mine safety. Rock mechanical characterization is crucial for understanding the large deformation of underground openings. Based on the theoretical analysis and laboratory triaxial tests, this study aims to propose a strength degradation model o ...
DOI:
10.1007/s12665-019-8044-3

10. The application of 0–1 mixed integer nonlinear programming optimization model based on a surrogate model to identify the groundwater pollution source

Author:
Guo, Jia-yuan; Lu, Wen-xi; Yang, Qing-chun; Miao, Tian-sheng
Source:
Journal of contaminant hydrology 2019 v.220 pp. 18-25
ISSN:
0169-7722
Subject:
groundwater contamination,   etc   ; algorithms; kriging; models;     Show all 4 Subjects
Abstract:
... The optimization model is presently used for the identification of pollution sources and it is based on non-linear programming optimization. The decision variables in this model are continuous, resulting in a weak recognition of integer variables including pollution source location. In addition, as the number of pollution sources increase, so the calculated load increases exponentially and accurac ...
DOI:
10.1016/j.jconhyd.2018.11.005

11. The Effect of Hydraulic Gradient and Pattern of Conduit Systems on Tracing Tests: Bench‐Scale Modeling

Author:
Mohammadi, Zargham; Gharaat, Mohammad Javad; Field, Malcolm
Source:
Ground water 2019 v.57 no.1 pp. 110-125
ISSN:
0017-467X
Subject:
groundwater,   etc   ; advection; aquifers; karsts; models;     Show all 5 Subjects
Abstract:
... Tracer breakthrough curves provide valuable information about the traced media, especially in inherently heterogeneous karst aquifers. In order to study the effect of variations in hydraulic gradient and conduit systems on breakthrough curves, a bench scale karst model was constructed. The bench scale karst model contains both matrix and a conduit. Eight tracing tests were conducted under a wide r ...
DOI:
10.1111/gwat.12659

12. Targeted delivery of hydrogen for the bioremediation of aquifers contaminated by dissolved chlorinated compounds

Author:
Maire, Julien; Davarzani, Hossein; Colombano, Stéfan; Fatin-Rouge, Nicolas
Source:
Environmental pollution 2019 v.249 pp. 443-452
ISSN:
0269-7491
Subject:
groundwater; groundwater contamination; groundwater flow,   etc   ; aquifers; bioremediation; foams; glass; hydrogen; models; permeability; surfactants;     Show all 11 Subjects
Abstract:
... Dihydrogen (H2) gas injection is a promising option to enhance the reductive biodehalogenation of contaminants in groundwater. However, it is challenging to ensure its targeted delivery at the right places in plumes, and for the long times required for bioremediation. In this paper, the ability of surfactant foam to retain H2 in the saturated zone and to enhance its release in the dissolved form w ...
DOI:
10.1016/j.envpol.2019.03.033

13. Relationships between rainfall and groundwater recharge in seasonally humid Benin: a comparative analysis of long-term hydrographs in sedimentary and crystalline aquifers

Author:
Kotchoni, D. O. Valerie; Vouillamoz, Jean-Michel; Lawson, Fabrice M. A.; Adjomayi, Philippe; Boukari, Moussa; Taylor, Richard G.
Source:
Hydrogeology journal 2019 v.27 no.2 pp. 447-457
ISSN:
1431-2174
Subject:
groundwater; groundwater extraction; groundwater recharge,   etc   ; aquifers; freshwater; hydrograph; magnetism; rain; sandstone; tropics; water table; Benin;     Show all 12 Subjects
Abstract:
... Groundwater is a vital source of freshwater throughout the tropics enabling access to safe water for domestic, agricultural and industrial purposes close to the point of demand. The sustainability of groundwater withdrawals is controlled, in part, by groundwater recharge, yet the conversion of rainfall into recharge remains inadequately understood, particularly in the tropics. This study examines ...
DOI:
10.1007/s10040-018-1806-2

14. Groundwater–lakewater interactions: an evaluation of the impacts of climate change and increased abstractions on groundwater contribution to the Volta Lake, Ghana

Author:
Yidana, Sandow Mark; Vakpo, Evans Kofi; Sakyi, Patrick Asamoah; Chegbeleh, Larry Pax; Akabzaa, Thomas M.
Source:
Environmental earth sciences 2019 v.78 no.3 pp. 74
ISSN:
1866-6280
Subject:
groundwater; groundwater flow; groundwater recharge,   etc   ; aquifers; basins; climate change; irrigation; lakes; models; Ghana;     Show all 10 Subjects
Abstract:
... A 3D steady state groundwater flow model has been calibrated for the Afram Plains portion of the Southern Voltaian Sedimentary Basin. The model was based on data of hydraulic parameters of the aquifer in the area, and regional groundwater recharge estimates conducted by various researchers using a variety of methods. Model calibration was conducted using hydraulic head data of 43 boreholes in the ...
DOI:
10.1007/s12665-019-8076-8

15. Minimization of Transient Groundwater Pumping Cost - Analytical and Practical Solutions

Author:
Katsifarakis, K.L.; Nikoletos, I.A.; Stavridis, Ch.
Source:
Water resources management 2018 v.32 no.3 pp. 1053-1069
ISSN:
0920-4741
Subject:
groundwater; groundwater flow,   etc   ; aquifers; wells;     Show all 4 Subjects
Abstract:
... In this paper, we study pumping cost minimization for any number and layout of wells under transient groundwater flow conditions in infinite confined aquifers and semi-infinite ones, to which the method of images applies. Moreover, we take into account additional steady-state flow, which is independent of the well system and results in non-horizontal initial hydraulic head level distribution. We p ...
DOI:
10.1007/s11269-017-1854-8

16. Paleo-hydrogeological reconstruction of the fresh-saline groundwater distribution in the Vietnamese Mekong Delta since the late Pleistocene

Author:
Hung Van Pham,; Van Geer, Frans C.; Bui Tran, Vuong; Dubelaar, Wim; Oude Essink, Gualbert H.P.
Source:
Journal of hydrology 2019 v.23 pp. 100594
ISSN:
2214-5818
Subject:
groundwater; groundwater flow; groundwater recharge,   etc   ; Pleistocene epoch; aquifers; coasts; models; permeability; river deltas; sea level; water salinity; Vietnam;     Show all 12 Subjects
Abstract:
... Mekong Delta, Vietnam (MKD).Present-day distribution of fresh-saline groundwater is highly heterogeneous in the MKD. Close to the coastline, fresh groundwater is found in aquifers up to 500 m below ground surface. To gain better insight into the fresh-saline groundwater evolution since the late Pleistocene, we simulated long-term groundwater flow and salt transport in a two-dimensional NW-SW cross ...
DOI:
10.1016/j.ejrh.2019.100594

17. Actively facilitated permeable reactive barrier for remediation of TCE from a low permeability aquifer: Field application

Author:
Bekele, Dawit N.; Du, Jianhua; de Freitas, Leandro Gomes; Mallavarapu, Megharaj; Chadalavada, Sreenivasulu; Naidu, Ravi
Source:
Journal of hydrology 2019 v.572 pp. 592-602
ISSN:
0022-1694
Subject:
groundwater; groundwater contamination; groundwater flow,   etc   ; aquifers; compliance; economic feasibility; models; monitoring; permeability; remediation; statistical analysis; trichloroethylene; wells;     Show all 13 Subjects
Abstract:
... Proven in situ treatment and remediation approaches are limited for low-permeability aquifers materials, particularly because of limitations to the delivery of reactive chemicals or access to contaminated plumes. In this paper, we describe the development of a cutting-edge solution for the remediation of contaminated groundwater in a low-permeability and low water-bearing aquifer contaminated with ...
DOI:
10.1016/j.jhydrol.2019.03.059

18. Implementation of Solute Transport in the Vadose Zone into the “HYDRUS Package for MODFLOW”

Author:
Beegum, Sahila; Šimůnek, Jiří; Szymkiewicz, Adam; Sudheer, K. P.; Nambi, Indumathi M.
Source:
Ground water 2019 v.57 no.3 pp. 392-408
ISSN:
0017-467X
Subject:
groundwater; groundwater contamination; groundwater flow,   etc   ; biogeochemistry; hydrologic models; solutes; sorption; unsaturated flow; vadose zone; volatilization; water table;     Show all 11 Subjects
Abstract:
... The “HYDRUS package for MODFLOW” is an existing MODFLOW package that allows MODFLOW to simultaneously evaluate transient water flow in both unsaturated and saturated zones. The package is based on incorporating parts of the HYDRUS‐1D model (to simulate unsaturated water flow in the vadose zone) into MODFLOW (to simulate saturated groundwater flow). The coupled model is effective in addressing spat ...
DOI:
10.1111/gwat.12815

19. Geological control on the origin of fresh groundwater in the Otindag Desert, China

Author:
Zhu, B.-Qi; Ren, X.-Zong; Rioual, Patrick
Source:
Applied geochemistry 2019 v.103 pp. 131-142
ISSN:
0883-2927
Subject:
groundwater; groundwater flow; groundwater recharge,   etc   ; altitude; aquifers; cold; deserts; hydrogeochemistry; mountains; stable isotopes; tectonics; tracer techniques; China;     Show all 13 Subjects
Abstract:
... The present study has explored the origin of fresh groundwater in the Otindag Desert, China using environmental tracers. The results characterize hydrochemical and isotopic properties of groundwater in this middle-latitude desert of Arid Asia, clarifying their spatial distribution and linkage with climatic, topographic and geologic settings, and interpreting the groundwater source and chemical evo ...
DOI:
10.1016/j.apgeochem.2019.03.006

20. Numerical model on the application of sand columns in recharge reservoir

Author:
Azis, Akhmad; Badaruddin, Sugiarto; Faisal, Zulvyah; Iqbal, Muh.Taufik; Hasanuddin, Haeril Abdi
Source:
Groundwater for sustainable development 2019 v.8 pp. 368-372
ISSN:
2352-801X
Subject:
groundwater; groundwater extraction; groundwater recharge,   etc   ; aquifers; mathematical models; regression analysis; saltwater intrusion; sand; subsidence; sustainable development; water quality; water shortages;     Show all 12 Subjects
Abstract:
... Excessive groundwater extraction may lead to groundwater depletion and causes land subsidence, sea water intrusion, and groundwater quality degradation. Regarding these problems, it is required to study the sand column placed at the base of the reservoir as an alternative solution to increase the amount of water recharged into the aquifer. In this study, numerical modelling was used to explore the ...
DOI:
10.1016/j.gsd.2018.12.004