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Artykuły w czasopismach na temat „Groundwater flow Computer simulation”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 28 stycznia 2023

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1

VAN HERWAARDEN, ONNO A., and JOHAN GRASMAN. "DISPERSIVE GROUNDWATER FLOW AND POLLUTION." Mathematical Models and Methods in Applied Sciences 01, no. 01 (March 1991): 61–81. http://dx.doi.org/10.1142/s0218202591000058.

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By solving asymptotically the Dirichlet problem for the backward Kolmogorov equation describing the random walk of a particle in a dispersive flow, it is computed at what rate contaminated particles cross the boundary of a protected zone. The method also yields an estimate of the expected arrival time.

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Wang, Yan, Wen Xia Wei, Hui Ling Han, and Ying Wang. "Groundwater Migration Modeling and Parameter Sensitivity Analysis on Contaminated Site." Advanced Materials Research 878 (January 2014): 775–81. http://dx.doi.org/10.4028/www.scientific.net/amr.878.775.

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Contamination control and remediation of groundwater is one of the hotness points in environmental protection field. Groundwater contamination numerical simulation is widely used for groundwater contamination transportation. In this paper, we constructed an indoor sandbox to conduct hydraulic control experiment and tracer experiment. We also set up groundwater flow model and solute transport model by computer and chose the model's key parameters for sensitivity analysis. The results indicated that the sensitivity of hydraulic conductivity was highest, which was the key parameter in the groundw

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Ji, Xiaohui, Tangpei Cheng, and Qun Wang. "CUDA-based solver for large-scale groundwater flow simulation." Engineering with Computers 28, no. 1 (February 19, 2011): 13–19. http://dx.doi.org/10.1007/s00366-011-0213-2.

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Kupfersberger, Hans, Gerhard Rock, and Johannes C. Draxler. "Combining Groundwater Flow Modeling and Local Estimates of Extreme Groundwater Levels to Predict the Groundwater Surface with a Return Period of 100 Years." Geosciences 10, no. 9 (September 18, 2020): 373. http://dx.doi.org/10.3390/geosciences10090373.

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Knowledge about extreme groundwater levels is needed to avoid structural or environmental damage by groundwater flooding. Typically, distributions of extreme groundwater levels are generated by interpolation between results derived from local extreme value analysis at groundwater observation wells. As an alternative methodology, we propose to apply the Gumbel distribution to groundwater level time series, which are computed by a groundwater flow model. In the approach, model-based and observation-based extreme groundwater values are compared at every observation well using the model simulation

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5

Lei, Xinbo, Xiuhua Zheng, Chenyang Duan, Jianhong Ye, and Kang Liu. "Three-Dimensional Numerical Simulation of Geothermal Field of Buried Pipe Group Coupled with Heat and Permeable Groundwater." Energies 12, no. 19 (September 27, 2019): 3698. http://dx.doi.org/10.3390/en12193698.

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The flow of groundwater and the interaction of buried pipe groups will affect the heat transfer efficiency and the distribution of the ground temperature field, thus affecting the design and operation of ground source heat pumps. Three-dimensional numerical simulation is an effective method to study the buried pipe heat exchanger and ground temperature distribution. According to the heat transfer control equation of non-isothermal pipe flow and porous media, combined with the influence of permeable groundwater and tube group, a heat-transfer coupled heat transfer model of the buried pipe group

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6

Zhao, Ying Wang, Xue Yuan Li, Shi Lei Chen, and Kai Bian. "Groundwater Flow Field Analysis and 3D Visualization System." Advanced Materials Research 1073-1076 (December 2014): 1664–68. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.1664.

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According to the low accuracy of velocity filed in current software, we develop a new system to analyze and visualize the 3D groundwater flow field. We employ the most advanced algorithm to deal with the data form groundwater simulation. The system could compute the flux across arbitrary face and the velocity of arbitrary point in the research domain. The system is debugged in Microsoft Visual Studio. The interactive interface is developed in .Net and the visualization tool is OpenGL. The application shows that the system is robust.

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7

Ryu, Han-Sun, Jinah Moon, Heejung Kim, and Jin-Yong Lee. "Modeling and Parametric Simulation of Microplastic Transport in Groundwater Environments." Applied Sciences 11, no. 16 (August 4, 2021): 7189. http://dx.doi.org/10.3390/app11167189.

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Efforts to reduce the toxic effects of microplastics (MPs) on the environment have increased globally in recent years. However, the existing models used for the simulation of contaminant transport in groundwater are meant for dissolved substances, which is not suitable for studying MPs. Therefore, in this study, the transport of MPs in a saturated porous medium was modeled by establishing governing equations. Simulations were performed using the finite element method to examine the effects of the parameters of the governing equations on the transport of MPs. The results suggest that it is nece

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8

Fischer, T., D. Naumov, S. Sattler, O. Kolditz, and M. Walther. "GO2OGS 1.0: a versatile workflow to integrate complex geological information with fault data into numerical simulation models." Geoscientific Model Development 8, no. 11 (November 12, 2015): 3681–94. http://dx.doi.org/10.5194/gmd-8-3681-2015.

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Abstract. We offer a versatile workflow to convert geological models built with the ParadigmTM GOCAD© (Geological Object Computer Aided Design) software into the open-source VTU (Visualization Toolkit unstructured grid) format for usage in numerical simulation models. Tackling relevant scientific questions or engineering tasks often involves multidisciplinary approaches. Conversion workflows are needed as a way of communication between the diverse tools of the various disciplines. Our approach offers an open-source, platform-independent, robust, and comprehensible method that is potentially us

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9

Wu, Yue, Yan-Zhi Li, Wei-Guo Qiao, Zhen-Wang Fan, Shuai Zhang, Kui Chen, and Lei Zhang. "Water Seepage in Rocks at Micro-Scale." Water 14, no. 18 (September 11, 2022): 2827. http://dx.doi.org/10.3390/w14182827.

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To complete groundwater diversion, the complex flow law of groundwater in rocks must be investigated so that groundwater diversion can be improved. This research uses the computer finite element method (FEM), CT scanning calculation method, Avizo method, and digital core technology combined with the Fluent calculation method (FCM) to reconstruct rocks with microscopic pore structures on a computer. The numerical simulation results under different conditions show that: the total pressure change gradually decreases under different pressure gradients. In a seepage channel, the seepage path does n

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10

Xueya, Lin, and Yang Yuesuo. "The Optimization of Ground Water Supply System in Shi Jiazhuang City, China." Water Science and Technology 24, no. 11 (December 1, 1991): 71–76. http://dx.doi.org/10.2166/wst.1991.0338.

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This paper established a response function of groundwater level using the principle of superposition formed a response matrix which combined the simulation model of groundwater flow system and the optimization model of groundwater supply system. The calculation was carried out by micro-computer. Two methods were used to determine the unit pulse value so as to calculate more accurate response coefficients. Based on the hydrogeologic conceptual model of the study area, a management model for optimization of groundwater supply system was established under the conditions of not only meeting the in

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11

Pongritsakda, Thatthep, Kengo Nakamura, Jiajie Wang, Noriaki Watanabe, and Takeshi Komai. "Prediction and Remediation of Groundwater Pollution in a Dynamic and Complex Hydrologic Environment of an Illegal Waste Dumping Site." Applied Sciences 11, no. 19 (October 4, 2021): 9229. http://dx.doi.org/10.3390/app11199229.

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The characteristics of groundwater pollution caused by illegal waste dumping and methods for predicting and remediating it are still poorly understood. Serious 1,4-dioxane groundwater pollution—which has multiple sources—has been occurring at an illegal waste dumping site in the Tohoku region of Japan. So far, anti-pollution countermeasures have been taken including the installation of an impermeable wall and the excavation of soils and waste as well as the monitoring of contamination concentrations. The objective of this numerical study was to clarify the possibility of predicting pollutant t

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12

Booij, M., A. Leijnse, S. Haldorsen, M. Heim, and H. Rueslåtten. "Subpermafrost Groundwater Modelling in Ny-Ålesund, Svalbard." Hydrology Research 29, no. 4-5 (August 1, 1998): 385–96. http://dx.doi.org/10.2166/nh.1998.0030.

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Svalbard is a high arctic archipelago where the permafrost thickness is 150-450 m and almost continuous in ice-free areas. The model work was carried out in Ny-Ålesund, where the subpermafrost aquifers are recharged by water from the bottom of the Vestre Lovénbreen glacier. One main discharge spring is found at the entrance of an old coal mine. The computer code SUTRA has been used to simulate two-dimensional fluid movement and energy transport in the ground under steady state conditions. For the simulation, a cross section with unit thickness parallel to groundwater flow has been chosen. With

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13

Triatmojo, Pramudita, and Mas Agus Mardyanto. "Forward Problems Solving of Groundwater Flow using Stochastic Groundwater Vistas Method." Jurnal Lahan Suboptimal : Journal of Suboptimal Lands 10, no. 2 (October 1, 2021): 160–69. http://dx.doi.org/10.36706/jlso.10.2.2021.525.

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In the forward problems, the hydraulic head value can be found by knowing the value of the groundwater parameter. Parameters of groundwater such as hydraulic conductivity, vary over space due to the variation of aquifer properties. Consequently, it is difficult or almost impossible to treat these kinds of variability by a deterministic approach because there is no exact value to be used as input for a parameter. The objective of this research was to obtain a mathematical model of groundwater flow made with the Groundwater Vistas Program that is in accordance with the physical model. Mathematic

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14

Akram, Sedki. "Improved Flower Pollination Algorithm for Optimal Groundwater Management." International Journal of Computational Intelligence and Applications 19, no. 03 (August 5, 2020): 2050022. http://dx.doi.org/10.1142/s1469026820500224.

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Groundwater management problems are typically of a large-scale nature, involving complex nonlinear objective functions and constraints, which are commonly evaluated through the use of numerical simulation models. Given these complexities, metaheuristic optimization algorithms have recently become popular choice for solving such complex problems which are difficult to solve by traditional methods. However, the practical applications of metaheuristics are severely challenged by the requirement of large number of function evaluations to achieve convergence. To overcome this shortcoming, many new

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15

Hughes, J. D., C. D. Langevin, and J. T. White. "MODFLOW-Based Coupled Surface Water Routing and Groundwater-Flow Simulation." Groundwater 53, no. 3 (June 5, 2014): 452–63. http://dx.doi.org/10.1111/gwat.12216.

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Bedekar, Vivek, Richard G. Niswonger, Kenneth Kipp, Sorab Panday, and Matthew Tonkin. "Approaches to the Simulation of Unconfined Flow and Perched Groundwater Flow in MODFLOW." Ground Water 50, no. 2 (June 2, 2011): 187–98. http://dx.doi.org/10.1111/j.1745-6584.2011.00829.x.

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17

Owen, S. J., N. L. Jones, and J. P. Holland. "A comprehensive modeling environment for the simulation of groundwater flow and transport." Engineering with Computers 12, no. 3-4 (September 1996): 235–42. http://dx.doi.org/10.1007/bf01198737.

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18

Cai, Jinbang, Yue Su, Huan Shen, and Yong Huang. "Simulation of Groundwater Flow in Fractured-Karst Aquifer with a Coupled Model in Maling Reservoir, China." Applied Sciences 11, no. 4 (February 21, 2021): 1888. http://dx.doi.org/10.3390/app11041888.

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A coupled model has been developed to simulate groundwater flow in fractured karst systems according to the complex geological and karst hydrogeological conditions of the dam site, where a 3D mathematical model based on Boussinesq equation was used to describe the movement of groundwater flow in fractured medium, and a 1D conduit model for karst medium. The model was solved with the continuous hydraulic heads at the common boundaries. The hydraulic conductivities of karst medium were determined by geometrical parameters and flux of pipes. Furthermore, the permeability parameters for fractured

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19

Tolera, Mesfin Benti, and Il-Moon Chung. "Integrated Hydrological Analysis of Little Akaki Watershed Using SWAT-MODFLOW, Ethiopia." Applied Sciences 11, no. 13 (June 28, 2021): 6011. http://dx.doi.org/10.3390/app11136011.

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In Ethiopia, groundwater is the main source of freshwater to support human consumption and socio-economic development. Little Akaki watershed is located in Upper Awash basin, known for its high annual rainfall and considered as the potential groundwater recharge zone. On the contrary, urbanization and industrial expansion are increasing at an alarming rate in the area. This became a concern threatening the groundwater resources’ sustainability. To address these challenges, integrated analysis of groundwater recharge and groundwater numerical simulations were made. For groundwater recharge esti

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20

Serageldin, Ahmed A., Ali Radwan, Yoshitaka Sakata, Takao Katsura, and Katsunori Nagano. "The Effect of Groundwater Flow on the Thermal Performance of a Novel Borehole Heat Exchanger for Ground Source Heat Pump Systems: Small Scale Experiments and Numerical Simulation." Energies 13, no. 6 (March 18, 2020): 1418. http://dx.doi.org/10.3390/en13061418.

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New small-scale experiments are carried out to study the effect of groundwater flow on the thermal performance of water ground heat exchangers for ground source heat pump systems. Four heat exchanger configurations are investigated; single U-tube with circular cross-section (SUC), single U-tube with an oval cross-section (SUO), single U-tube with circular cross-section and single spacer with circular cross-section (SUC + SSC) and single U-tube with an oval cross-section and single spacer with circular cross-section (SUO + SSC). The soil temperature distributions along the horizontal and vertic

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21

Kaneko, Shohei, Akira Tomigashi, Takeshi Ishihara, Gaurav Shrestha, Mayumi Yoshioka, and Youhei Uchida. "Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology." Energies 13, no. 8 (April 11, 2020): 1872. http://dx.doi.org/10.3390/en13081872.

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The installation potential of ground-source heat pump (GSHP) systems has been studied based on the spatial interpolation of numerical simulation results using ground heat exchanger (GHE) models. This study is the first to create an estimation formula for the heat exchange rate (HER) to obtain a solution equivalent to the numerical analysis results considering the average method when supplying three-dimensional (3D) hydrogeological information that affects the HER to a two-dimensional (2D) map. It was found that the main factors affecting the HER were groundwater flow velocity, subsurface tempe

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22

An, Nguyen Ngoc, Huynh Song Nhut, Tran Anh Phuong, Vu Quang Huy, Nguyen Cao Hanh, Giang Thi Phuong Thao, Pham The Trinh, Pham Viet Hoa, and Nguyễn An Bình. "Groundwater simulation in Dak Lak province based on MODFLOW model and climate change scenarios." Frontiers in Engineering and Built Environment 2, no. 1 (January 25, 2022): 55–67. http://dx.doi.org/10.1108/febe-11-2021-0055.

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PurposeGroundwater plays a critical part in both natural and human existence. When surface water is scarce in arid climates, groundwater becomes an immensely valuable resource. Dak Lak is an area that frequently lacks water resources for everyday living and production, and the scarcity of water resources is exacerbated during the dry season. As a result, it is critical to do study and understand about groundwater to meet the region's water demand. This study aims to extend the use of the MODFLOW model for groundwater simulation and assess the overall groundwater reserves and water demand in th

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Cheng, Tangpei, Zeyao Mo, and Jingli Shao. "Accelerating Groundwater Flow Simulation in MODFLOW Using JASMIN-Based Parallel Computing." Groundwater 52, no. 2 (April 18, 2013): 194–205. http://dx.doi.org/10.1111/gwat.12047.

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Kobayashi, Kenichiro, Reinhard Hinkelmann, and Rainer Helmig. "Development of a simulation–optimization model for multiphase systems in the subsurface: a challenge to real-world simulation–optimization." Journal of Hydroinformatics 10, no. 2 (March 1, 2008): 139–52. http://dx.doi.org/10.2166/hydro.2008.013.

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The main purpose of this paper is to demonstrate the capability of a new simulation–optimization model especially tailored to investigate the optimal management strategy of a closed coal mine in the Ruhr, Germany. This paper deals with the multiphase/multicomponent flow simulation; the optimization model (simulated annealing); the mesh generation function; the coupling of them; and the use of a parallel computer. Firstly, a mesh generation function is included in the total procedure for the modelling of complex system configurations often required when the real-world problem is dealt with. The

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25

Głogowski, Arkadiusz, and Mieczysław Chalfen. "Analysis of the effectiveness of the systems protecting against the impact of water damming in the river on the increase of groundwater level on the example of the Malczyce dam." ITM Web of Conferences 23 (2018): 00011. http://dx.doi.org/10.1051/itmconf/20182300011.

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The aim of the article is to determine to what extent individual elements of the project protecting the village of Rzeczyca and adjacent areas against flooding after the planned damming up of water in the Odra on the Malczyce dam. The assessment of the impact of damming on the nearby towns was made using a mathematical model based on a two-dimensional and non-stationary version of the Boussinesq equation and the finite element method (FEM). In the simulations, the proprietary FIZ software was used for calculating water flow and chemical pollution in a porous medium. Four computer simulations w

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26

Rudolph, D. L., and E. A. Sudicky. "Simulation of groundwater flow in complex multiaquifer systems: Performance of a quasi three-dimensional technique in the steady-state case." Canadian Geotechnical Journal 27, no. 5 (October 1, 1990): 590–600. http://dx.doi.org/10.1139/t90-074.

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The ability of the classical quasi three-dimensional formulation to describe steady-state groundwater flow problems in complex multiaquifer environments is examined. In the present formulation, discontinuities in the aquifer and aquitard units can be accommodated along with partial or complete aquifer dewatering and confined or unconfined flow conditions. Some of the main assumptions underlying classical quasi three-dimensional schemes are scrutinized, including the requirement of a two orders of magnitude permeability contrast between aquifers and aquitards. Performance of the numerical schem

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27

Hanasaki, Naota, Sayaka Yoshikawa, Yadu Pokhrel, and Shinjiro Kanae. "A global hydrological simulation to specify the sources of water used by humans." Hydrology and Earth System Sciences 22, no. 1 (January 29, 2018): 789–817. http://dx.doi.org/10.5194/hess-22-789-2018.

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Abstract. Humans abstract water from various sources to sustain their livelihood and society. Some global hydrological models (GHMs) include explicit schemes of human water abstraction, but the representation and performance of these schemes remain limited. We substantially enhanced the water abstraction schemes of the H08 GHM. This enabled us to estimate water abstraction from six major water sources, namely, river flow regulated by global reservoirs (i.e., reservoirs regulating the flow of the world's major rivers), aqueduct water transfer, local reservoirs, seawater desalination, renewable

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28

Budinski, Ljubomir, Julius Fabian, and Matija Stipic. "Modeling groundwater flow by lattice Boltzmann method in curvilinear coordinates." International Journal of Modern Physics C 26, no. 02 (February 2015): 1550013. http://dx.doi.org/10.1142/s0129183115500138.

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In order to promote the use of the lattice Boltzmann method (LBM) for the simulation of isotropic groundwater flow in a confined aquifer with arbitrary geometry, Poisson's equation was transformed into a curvilinear coordinate system. With the metric function between the physical and the computational domain established, Poisson's equation written in Cartesian coordinates was transformed in curvilinear coordinates. Following, the appropriate equilibrium function for the D2Q9 square lattice has been defined. The resulting curvilinear formulation of the LBM for groundwater flow is capable of mod

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29

Bultreys, T., S. Van Offenwert, W. Goethals, M. N. Boone, J. Aelterman, and V. Cnudde. "X-ray tomographic micro-particle velocimetry in porous media." Physics of Fluids 34, no. 4 (April 2022): 042008. http://dx.doi.org/10.1063/5.0088000.

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Fluid flow through intricate confining geometries often exhibits complex behaviors, certainly in porous materials, e.g., in groundwater flows or the operation of filtration devices and porous catalysts. However, it has remained extremely challenging to measure 3D flow fields in such micrometer-scale geometries. Here, we introduce a new 3D velocimetry approach for optically opaque porous materials, based on time-resolved x-ray micro-computed tomography (CT). We imaged the movement of x-ray tracing micro-particles in creeping flows through the pores of a sandpack and a porous filter, using labor

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30

Szymkiewicz, Adam, Anna Gumuła-Kawęcka, Dawid Potrykus, Beata Jaworska-Szulc, Małgorzata Pruszkowska-Caceres, and Wioletta Gorczewska-Langner. "Estimation of Conservative Contaminant Travel Time through Vadose Zone Based on Transient and Steady Flow Approaches." Water 10, no. 10 (October 10, 2018): 1417. http://dx.doi.org/10.3390/w10101417.

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Estimation of contaminant travel time through the vadose zone is needed for assessing groundwater vulnerability to pollution, planning monitoring and remediation activities or predicting the effect of land use change or climate change on groundwater quality. The travel time can be obtained from numerical simulations of transient flow and transport in the unsaturated soil profile, which typically require a large amount of data and considerable computational effort. Alternatively, one can use simpler analytical methods based on the assumptions of steady water flow and purely advective transport.

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Maier, Robert S., D. M. Kroll, H. Ted Davis, and Robert S. Bernard. "Pore-Scale Flow and Dispersion." International Journal of Modern Physics C 09, no. 08 (December 1998): 1523–33. http://dx.doi.org/10.1142/s0129183198001370.

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Pore-scale simulations of fluid flow and mass transport offer a direct means to reproduce and verify laboratory measurements in porous media. We have compared lattice-Boltzmann (LB) flow simulations with the results of NMR spectroscopy from several published flow experiments. Although there is qualitative agreement, the differences highlight numerical and experimental issues, including the rate of spatial convergence, and the effect of signal attenuation near solid surfaces. For the range of Reynolds numbers relevant to groundwater investigations, the normalized distribution of fluid velocitie

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Yang, Zhiquan, Dan Zhang, Chaoyue Li, Zhiwei Zhang, Yingyan Zhu, Yi Yang, Na He, et al. "Column Penetration and Diffusion Mechanism of Bingham Fluid Considering Displacement Effect." Applied Sciences 12, no. 11 (May 25, 2022): 5362. http://dx.doi.org/10.3390/app12115362.

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The diffusion progress of grout is hindered by groundwater, which means the diffusion distance cannot reach the designed values required in engineering for water plugging or reinforcement. In this study, based on the generalized Darcy’s law and the continuity equation of steady column penetration, a column diffusion mechanism for Bingham fluid, considering the displacement effect of grout on groundwater, is proposed. This diffusion mechanism is then validated by the penetration grouting experiments that have been previously performed. The influences of the grouting pressure, groundwater pressu

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Ashby, S. F., W. J. Bosl, R. D. Falgout, S. G. Smith, A. F. B. Tompson, and T. J. Williams. "A Numerical Simulation of Groundwater Flow and Contaminant Transport on the CRAY T3D and C90 Supercomputers." International Journal of High Performance Computing Applications 13, no. 1 (March 1999): 80–93. http://dx.doi.org/10.1177/109434209901300105.

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Phoban, Harutus, Uma Seeboonruang, and Prateep Lueprasert. "Numerical Modeling of Single Pile Behaviors Due to Groundwater Level Rising." Applied Sciences 11, no. 13 (June 22, 2021): 5782. http://dx.doi.org/10.3390/app11135782.

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Behaviors of the pile foundation due to groundwater level rising were analyzed by a series two-dimensional finite element analyses with fully coupled flow-deformation analysis. The different numerical models of single bore pile depth and diameter in Bangkok subsoil were represented with the parametric study. The pile–soil movement due to groundwater levels rising between numerical simulation and a previous experiment of the centrifuge test as the same condition are in good agreement. With rising groundwater level, the reduction of pile capacity can be evidently performed by the increase of pil

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Liu, Sida, Yangxiao Zhou, Mingzhao Xie, Michael E. McCalin, and Xu-Sheng Wang. "Comparative Assessment of Methods for Coupling Regional and Local Groundwater Flow Models: A Case Study in the Beijing Plain, China." Water 13, no. 16 (August 16, 2021): 2229. http://dx.doi.org/10.3390/w13162229.

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A coupled regional and local model is required when groundwater flow and solute transport are to be simulated in local areas of interest with a finer grid while regional aquifer boundary and major stresses should be retained with a coarser grid. The coupled model should also maintain interactions between the regional and local flow systems. In the Beijing Plain (China), assessment of managed aquifer recharge (MAR), groundwater pollution caused by rivers, capture zone of well fields, and land subsidence at the cone of depression requires a coupled regional and local model. This study evaluates

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Wang, Xiaopu, Lianjie Hou, Tianhao He, Zhenhan Diao, Chuanjin Yao, Tao Long, and Ling Fan. "Numerical Simulation of the Enrichment of Chemotactic Bacteria in Oil-Water Two-Phase Transfer Fields of Heterogeneous Porous Media." Applied Sciences 12, no. 10 (May 21, 2022): 5215. http://dx.doi.org/10.3390/app12105215.

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Oil pollution in soil-groundwater systems is difficult to remove, and a large amount of residual oil is trapped in the low permeable layer of the heterogeneous aquifer. Aromatic hydrocarbons in oil have high toxicity and low solubility in water, which are harmful to the ecological environment. Chemotactic degrading bacteria can perceive the concentration gradient of non-aqueous phase liquid (NAPL) pollutants in the groundwater environment, and enrich and proliferate around the pollutants, thus achieving a more efficient and thorough remediation effect. However, the existing theoretical models

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Refsgaard, Anders, Steen Christensen, and Jan Reffstrup. "Finite Element Analysis of Controlled Saltwater Intrusion in Heterogeneous Reservoirs." Hydrology Research 20, no. 1 (February 1, 1989): 25–42. http://dx.doi.org/10.2166/nh.1989.0003.

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Environmental cleaning operations in coastal areas by pumping are complicated by the presence of both fresh water and salt water. The density difference makes the flow conditions very complicated to predict especially if the situation is further complicated by highly heterogeneous formations. The present paper gives results from a computer simulation of saltwater movements during pumping in a heterogeneous coastal reservoir. The example problem discussed in the paper is based on data from a polluted area in the north west of Denmark. A chemical plant situated on a small peninsular has caused s

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Rabemaharitra, Tahirinandraina Prudence, Yanhong Zou, Zhuowei Yi, Yong He, and Umair Khan. "Optimized Pilot Point Emplacement Based Groundwater Flow Calibration Method for Heterogeneous Small-Scale Area." Applied Sciences 12, no. 9 (May 6, 2022): 4648. http://dx.doi.org/10.3390/app12094648.

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Groundwater flow modeling in a small-scale area requires practical techniques to obtain high accuracy results. The effectiveness of the model calibration is the most challenging for simulating the hydraulic head. In pursuit of this, we proposed an optimized groundwater flow calibration method based on the pilot point emplacement technique for a 3D small-scale area in this work. Subsequently, two emplacement structures were tested during the experimentation, the regular pilot point placement, and the middle head measurement down gradient (MHMDG) placement with two different densities. The param

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Pasetto, Damiano, Alberto Guadagnini, and Mario Putti. "A reduced-order model for Monte Carlo simulations of stochastic groundwater flow." Computational Geosciences 18, no. 2 (December 19, 2013): 157–69. http://dx.doi.org/10.1007/s10596-013-9389-4.

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Timaniya, Aman, and Nayankumar Soni. "“Modeling of Saline Water Intrusion using MODFLOW in Una Coastal Aquifer of Gujarat, India.”." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (May 31, 2022): 634–40. http://dx.doi.org/10.22214/ijraset.2022.42309.

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Abstract: Groundwater is the most valuable and extensively dispersed resource on the planet, and unlike any other mineral resource, it is replenished annually by meteoric precipitation. The present study would include simulation and modelling of the problem of seawater intrusion in the Una coastal area of Gujarat. The interrelationships of two miscible fluids in porous media have been widely explored both theoretically and experimentally. Because of the extreme salinity, many agricultural wells are no longer used. This high salinity is a sign of a process known as saltwater intrusion, which oc

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Al-Barwani, H. H., M. Al-Lawatia, E. Balakrishnan, and A. Purnama. "Modeling Flow and Transport in Unsaturated Porous Media: A Review." Sultan Qaboos University Journal for Science [SQUJS] 5 (December 1, 2000): 265. http://dx.doi.org/10.24200/squjs.vol5iss0pp265-280.

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Underground water is a vital natural resource and every effort should be made to understand ways and means of efficiently using and managing it. The unsaturated zone, bounded at its top by the land surface and below by the water table, is the region through which water, together with pollutant carried by the water, infiltrates to reach the groundwater. Therefore, various processes occurring within the unsaturated zone play a major role in determining both the quality and quantity of water recharging into the groundwater. Classical methods of predicting water flow and contaminant transport proc

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Wu, Yue, Wei-Guo Qiao, Yan-Zhi Li, Zhen-Wang Fan, Shuai Zhang, Lei Zhang, and Xiao-Li Zhang. "Seepage of Groundwater in an Underground Fractured Rock Mass and Its Sustainable Engineering Application." Applied Sciences 12, no. 16 (August 17, 2022): 8221. http://dx.doi.org/10.3390/app12168221.

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Due to the existence of tiny cracks in rock, underground engineering has begun to consider how to divert a large amount of groundwater. To divert groundwater more effectively, it is necessary to master the seepage characteristics of fluids in the micropores of rocks. Based on rock samples obtained from an underground engineering site, this paper analyzes the microscopic pore structure of the rock through a combination of laboratory tests and numerical simulations and inputs this information into a computer model. The fluid seepage state in the rock under different conditions is simulated in th

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Šoltész, Andrej, Dana Baroková, Zinaw Dingetu Shenga, and Michaela Červeňanská. "Hydraulic Assessment of the Impacts of Gate Realization on Groundwater Regime." Pollack Periodica 15, no. 3 (November 7, 2020): 162–71. http://dx.doi.org/10.1556/606.2020.15.3.16.

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Presented paper deals with the hydraulic assessment of groundwater flow in the area affected by the realization of the hydraulic gate on the Klátov branch and in the adjacent territory of a dike, which is located on the right-side of Little Danube. This hydraulic assessment is part of the project of the Slovak Water Management Enterprise, which also aims to increase the height and seal the dike on the right-side of the Little Danube. Generally, the project is divided into three phases (Phase I, II and III) to implement different technical measures to protect the area from flooding. The assumpt

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Nyende, Jacob, Isaac Enyogoi, John Mango, and Henry Kasumba. "Numerical Simulation of a Two-Dimensional Groundwater Pollute Transport Problem Using Incompressible Steady-State Navier-Stokes Equations and Diffusion-Convection Equations." Modelling and Simulation in Engineering 2022 (April 12, 2022): 1–20. http://dx.doi.org/10.1155/2022/7419502.

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Most of the real contaminant problems are defined domains that are geometrically complex and can have different boundary conditions in different areas. Therefore, it is usually difficult to find a solution analytically, so we use the approximate method to generate an approximate function. One answer to this problem is the finite element approach (FEM). This study presents a partial differential equation (PDE) simulation system that uses numerical techniques for the distribution of pollutant concentrations in groundwater in space and time. The movement of the liquid is described by the incompre

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Tracy, Fred Thomas, Thomas C. Oppe, and Maureen K. Corcoran. "A comparison of MPI and co-array FORTRAN for large finite element variably saturated flow simulations." Scalable Computing: Practice and Experience 19, no. 4 (December 29, 2018): 423–32. http://dx.doi.org/10.12694/scpe.v19i4.1468.

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The purpose of this research is to determine how well co-array FORTRAN (CAF) performs relative to Message Passing Interface (MPI) on unstructured mesh finite element groundwater modelling applications with large problem sizes and core counts. This research used almost 150 million nodes and 300 million 3-D prism elements. Results for both the Cray XE6 and Cray XC30 are given. A comparison of the ghost-node update algorithms with source code provided for both MPI and CAF is also presented.

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Lyons, Richard T., Richard C. Peralta, and Partha Majumder. "Comparing Single-Objective Optimization Protocols for Calibrating the Birds Nest Aquifer Model—A Problem Having Multiple Local Optima." International Journal of Environmental Research and Public Health 17, no. 3 (January 30, 2020): 853. http://dx.doi.org/10.3390/ijerph17030853.

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To best represent reality, simulation models of environmental and health-related systems might be very nonlinear. Model calibration ideally identifies globally optimal sets of parameters to use for subsequent prediction. For a nonlinear system having multiple local optima, calibration can be tedious. For such a system, we contrast calibration results from PEST, a commonly used automated parameter estimation program versus several meta-heuristic global optimizers available as external packages for the Python computer language—the Gray Wolf Optimization (GWO) algorithm; the DYCORS optimizer fram

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Abd-Elaty, Ismail, Martina Zeleňáková, Katarína Krajníková, and Hany Abd-Elhamid. "Analytical Solution of Saltwater Intrusion in Costal Aquifers Considering Climate Changes and Different Boundary Conditions." Water 13, no. 7 (April 4, 2021): 995. http://dx.doi.org/10.3390/w13070995.

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Groundwater contamination due to saltwater intrusion (SWI) has an extreme effect on freshwater quality. Analytical and numerical models could be used to investigate SWI. This study aims to develop an analytical solution to investigate SWI into coastal aquifers which was applied to a real case study at the Middle Nile Delta aquifer (MNDA). The study presented a new formula to predict the difference in depth of freshwater to seawater interface due to a change in boundary conditions. A Computer Program for Simulation of Three-Dimensional Variable-Density Ground-Water Flow and Transport (SEAWAT) i

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Chen, Wenfang, Yaobin Zhang, Weiwei Shi, Yali Cui, Qiulan Zhang, Yakun Shi, and Zexin Liang. "Analysis of Hydrogeochemical Characteristics and Origins of Chromium Contamination in Groundwater at a Site in Xinxiang City, Henan Province." Applied Sciences 11, no. 24 (December 9, 2021): 11683. http://dx.doi.org/10.3390/app112411683.

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Hexavalent chromium contamination in groundwater has become a very serious and challenging problem. Identification of the groundwater chemical characteristics of the sites and their control mechanisms for remediation of pollutants is a significant challenge. In this study, a contaminated site in Xinxiang City, Henan Province, was investigated and 92 groundwater samples were collected from the site. Furthermore, the hydrogeochemical characteristics and the distribution patterns of components in the groundwater were analyzed by a combination of multivariate statistical analysis, Piper diagram, G

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Wang, Weishu, Chuang Li, Yun-Ze Li, Man Yuan, and Tong Li. "Numerical Analysis of Heat Transfer Performance of In Situ Thermal Remediation of Large Polluted Soil Areas." Energies 12, no. 24 (December 5, 2019): 4622. http://dx.doi.org/10.3390/en12244622.

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In recent years soil contamination has become a global problem because of industrial development. In situ thermal remediation has been proposed recently to not only lower costs, but also reduce the environmental impact compared to other soil remediation technologies such as chemical remediation. During the soil thermal remediation process, factors such as soil type and water content affecting the heat transfer pose challenges. In this study, a simple mathematical model is presented and the heat transfer performance during the soil heating process is researched via COMSOL Multiphysics 5.3 softw

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Andrássy, Tomáš, and Dana Baroková. "Numerical modeling of groundwater flow close to drinking water resources during flood events." Pollack Periodica 11, no. 1 (April 2016): 43–54. http://dx.doi.org/10.1556/606.2016.11.1.5.

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