groundwater modeling Articles
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The characteristics of probability distribution of groundwater model output based on sensitivity analysis
The probability distribution of groundwater model output is the direct product of modeling uncertainty. In this work, we aim to analyze the probability distribution of groundwater model outputs (groundwater level series and budget terms) based on sensitivity analysis. In addition, two sources of uncertainties are considered in this study: (1) the probability distribution of model's input ...
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Applicability of the most frequent value method in groundwater modeling
The Most Frequent Value Method (MFV) is applied to groundwater modeling as a robust and effective geostatistical method. The Most Frequent Value method is theoretically derived from the minimization of the information loss called the I-divergence. The MFV algorithm is then coupled with global optimization (Very Fast Simulated Annealing) to provide a powerful method for solving the inverse ...
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Evaluating the cumulative rainfall deviation approach for projecting groundwater levels under future climate
In south-western Australia (SWA) groundwater levels have been declining under the changing climate associated with a decline of rainfall. Possible future groundwater yields in SWA have been estimated under a range of climate change scenarios using a number of numerical groundwater models. For the Northern Perth Basin (NPB) in SWA, where no groundwater models were available, a relatively simple ...
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Integrating GIS and Groundwater Modeling Technologies for SWAPP Development
Groundwater Modeling and GIS Technologies: Powerful Tools for Data Integration and Analysis Groundwater modeling and Geographic Information System (GIS) technologies are useful tools for developing a Source Water Assessment and Protection Plan (SWAPP) to assist planners in protecting groundwater ...
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A possible modification of groundwater flow equation using coordinate transformations
We described a groundwater model with prolate spheroid coordinates, and introduced a new parameter, namely τ the silhouette influence of the geometric under which the water flows. At first, we supposed that the silhouette influence approaches zero; under this assumption, the modified equation collapsed to the ordinary groundwater flow equation. We proposed an analytical solution to the ...
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The application of groundwater modelling to simulate the behaviour of groundwater resources in the Ramhormooz Aquifer, Iran
In this study, groundwater modelling was proposed as management tool in Ramhormooz Plain, south western Iran. After definition of a conceptual model, the necessary data were defined into various packages of MODFLOW. Subsequently, the model was calibrated by trial and error estimation and the results were finally optimised by PMWIN through PEST code. After verification process, the model was used ...
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The dynamic programming management model of groundwater with covariates: a case study for the Songyuan area, Jilin Province, China
This research analysed the action and characteristics of the relationship between mutual-feed joint-variations of groundwater. On this basis, a theory and method for constructing a dynamic programming management model for groundwater with covariates was proposed which used the state transition equation method. The model was solved using the differential dynamic programming (DDP) method. ...
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Mine Dewatering in a Compartmentalized Hydrogeologic Setting at Sishen Mine in South Africa
Abstract: Sishen mine in South Africa is one of the largest open-pit iron mines in the world. It is characterized by a complex, compartmentalized hydrogeologic setting that comprised numerous dykes, regional water-bearing faults, and inter-bedded localized geologic units. The groundwater flow in the vicinity is mainly controlled by regional dykes and faults in a karst aquifer. A 3-D groundwater ...
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Impact of pumping in open pit mining on groundwater flow: a case study
The groundwater flow behaviour was analysed during pre-monsoon, monsoon, and post-monsoon seasons. At first, the groundwater model was analysed in the steady state, and then the same was applied in the transient state to predict the spatio-temporal behaviour of groundwater in the region. Transient flow model was also developed to estimate the potential impact of pumping of groundwater due to ...
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A framework for accurate geospatial modeling using image ranking and machine learning
There is a large class of modeling problems where the complexity of the underlying phenomena is overwhelming and hence the accuracy of mathematical models is limited. Our approach to this class of problems is to design frameworks that bring together physically based and data-driven models, and incorporate the tacit knowledge of experts by providing visual exploration and feedback capabilities. ...
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Evaluating the impact of grid cell properties in spatial discretization of groundwater model for a tropical karst catchment in Rote Island, Indonesia
To assess the effect of three grid cell properties (size, mean slope of the surface and distance between centre of grid and observation well) on groundwater models' performances, a tropical karst catchment characterized by monsoonal season in Rote Island, Indonesia was selected. Here, MODFLOW was used to develop models with five different spatial discretization schemes: 10 × 10 m, 20 × 20 m, ...
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A refined groundwater flow model of the shallow aquifer in Tianjin Municipality, China
The assembly of a groundwater flow model for the shallow aquifer in Tianjin Municipality is outlined in this paper. Tianjin Municipality was selected because of its complicated hydrogeological conditions and rich data, which could be used to test a refined groundwater flow model for the shallow aquifer. When a shallow groundwater flow model is being assembled its recharge and discharge ...
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Sustainable groundwater modeling using single- and multi-objective optimization algorithms
This study presents the first attempt to link the multi-algorithm genetically adaptive search method (AMALGAM) with a groundwater model to define pumping rates within a well distributed set of Pareto solutions. The pumping rates along with three minimization objectives, i.e. minimizing shortage affected by the failure to supply, modified shortage index and minimization of extent of drawdown ...
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Optimal groundwater management using state-space surrogate models: a case study for an arid coastal region
A surrogate modeling framework is developed in this study to circumvent the computational burden of high-fidelity numerical groundwater models for arid coastal aquifers. Two different surrogate models, namely, artificial neural network (ANN) and Gaussian process model (GPM) are trained to replace the computationally expensive numerical flow and transport model OpenGeoSys. A novel time-dependent ...
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Ranking of conceptualized groundwater models based on model information criteria
Modelers typically test alternative conceptualizations of a groundwater system because the ‘true’ hydrogeological model of the system is unknown, and the observed data are limited. This study elaborates on how to rank different conceptualizations of a groundwater system by using selection techniques and criteria that make a balance between complexity and accuracy of models. ...
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Evaluation of the potential impact of Grand Ethiopian Renaissance Dam and pumping scenarios on groundwater level in the Nile Delta aquifer
The main objective of this study is to evaluate the potential impact of Grand Ethiopian Renaissance Dam (GERD) and pumping scenarios on groundwater level by a three-dimensional groundwater model of the Nile Delta using MODFLOW software. The Nile Delta has highly intensive irrigation canal networks that share yearly about 35.5 km3 of water. In this study, an integrated three-dimensional ...
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Chlorinated Solvent Remediation - Former Printing Facility, Major City, State of New Jersey - Case Study
Accelerated Remediation Technologies, Inc. (ART) treatment technologies were selected to remedy soil and groundwater impacted with chlorinated solvents at a former major printing facility in New Jersey. Site Description: The Subsurface at the site consists of sandy soils with intermittent clay lenses. Depth to groundwater is approximately 40 feet below grade surface. The hydraulic conductivity ...
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Questioning the applicability of the areal leakage factor as a constant hydro-geological parameter
The differential equation of the flow through a leaky aquifer considers the leakage factor a constant hydro-geological parameter. The purpose of this research paper is to examine the suitability of this constant for the simulation of the distribution of the piezometric heads through leaky aquifers. To perform this task, a proposed explicit finite difference scheme for the determination of the ...
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Assessing climate change impact on root-zone water balance and groundwater levels
The present study employs regional climate model projections for assessing the impact of root-zone water balance and groundwater levels using crop and groundwater models. The projections from Hadley Regional Model 3 (HRM3) for A1B scenario showed an increase in temperature and rainfall (RF) of 1.8 °C and 328 mm, respectively, during mid-century (MC) (2021–2050) for Indian central Punjab. The ...
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Modelling of coastal hydrogeology of Krishna delta in India
Numerical techniques are widely used for modelling groundwater aquifers. Hydrological models are generally concept based and highly non-linear due to complex parameterisation as compared to models of other disciplines. Calibration and validation of such models cannot follow conventional methods borrowed from other disciplines many times due to scale of the model domain. In the present paper, ...
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