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Groundwater Modeling
Published in Mohammad Karamouz, Azadeh Ahmadi, Masih Akhbari, Groundwater Hydrology, 2020
Mohammad Karamouz, Azadeh Ahmadi, Masih Akhbari
In addition to simulating groundwater flow, the scope of MODFLOW-2000 has been expanded to incorporate capabilities such as solute transport and parameter estimation. In this model, the groundwater flow equation is solved using the FDA. The flow region is subdivided into blocks in which the medium properties are assumed to be uniform. In the plan view, blocks are made from a grid of mutually perpendicular lines that may be variably spaced. Model layers can have varying thicknesses. A flow equation is written for each block, or cell. Several methods are provided for solving the resulting matrix problem; the user can choose the best one for a particular problem. Flow rate and cumulative volume, which are balanced from each type of inflow and outflow, are computed for each time step.
Groundwater environmental impact assessment of Red Bull beverage due to mining water in Guangdong Province
Published in Ai Sheng, Energy, Environment and Green Building Materials, 2015
L.S. Tang, H.T. Sang, Y.L. Sun, Z.G. Luo
Groundwater system is made up of groundwater aquifer system and groundwater flow system; it is influenced by natural factors (meteorological, hydrological, geological, etc.) and man-made factors (mining, irrigation, reservoir permeability, etc.). The influence factors are different, especially for the different types of groundwater. So the study of groundwater system is more difficult than surface water system. Because of the flexibility, efficiency, and convenience of numerical simulation, it becomes the important technical means in simulation of groundwater flow and groundwater environment impact assessment. MODFLOW (Modular Three-dimensional Finite Difference Groundwater Flow Model) is a three-dimensional groundwater flow numerical simulation software that was developed by the USGS in the 1980s. MODFLOW adopts a modular structure that is made up of a main program and several relatively independent packages. The packages include Modflow, Modpath, MT3D, and Zone Budget [1] and other features of the package are still being developed. Based on the finite difference method, its advantage is that the various steps are closely connected from start modeling, input, changing hydrogeological parameters and geometric parameters, operating model, and inverting correction parameters to real output. The whole process is systematic and normative from beginning to end. Currently, it is being used in the foundation pit precipitation simulation [2], groundwater resources evaluation [3], mine draining analysis, and mine water inflow forecast [4] in the domestic sphere.
Application of 3D groundwater models to the assessment of ARD source loadings in surface water bodies
Published in A.A. Balkema, Tailings and Mine Waste 2000, 2022
MODFLOW is a 3D, finite difference, saturated groundwater flow code developed by the United States Geological Survey (USGS; McDonald and Harbaugh, 1988) and is recognized as a standard code for groundwater flow modelling. MODFLOW can be used as a true 3D-simulation package by assigning appropriate values of vertical conductance and block thickness and building the topography into the layer structure. Figure 1 shows a schematic representation of a true 3D MODFLOW mesh.
Groundwater flow modeling for cachar, India using MODFLOW: a case study
Published in ISH Journal of Hydraulic Engineering, 2022
Mrinal Kumar Singh, Susmita Ghosh
MODFLOW is the USGS modular three-dimensional groundwater flow model. It has a compatible programming code structure that may be easily modified to adapt the code for a specific groundwater system (McDonald and Harbaugh 1984). Developed groundwater flow model using MODFLOW helps in the study of various groundwater-related issues like – surface water–groundwater interaction (Brunner et al. 2010; Osman and Bruen 2002), to interpret and predict the groundwater variation by the integration of surface hydrologic model with MODFLOW (Chen et al. 2017), waterlogging and salinization problem (Khan et al. 2017; Mirlas 2009) arresting the declining trend of water table head (Lamsoge et al. 2014; Abdulla and Al-Assa’d 2006), simulation of groundwater levels (Qiu et al. 2015; Wu et al. 2011), simulating the impact of groundwater pumping on stream aquifer interaction (Zume and Tarhule 2008) and obtain water-diversion function for the replenishment of aquifer the as a criterion (Korkmaz et al. 2016).
Assessment of soil subsidence due to long-term dewatering, Esna city, Egypt
Published in Water Science, 2019
M. Al-Sittawy, S. Gad, R. Fouad, E. Nofal
Digital models of groundwater flow are widely used to study the response of aquifer systems from pumping stress. A new computer program (SUB-WT) was developed by (USGS) to simulate the vertical compaction in models of groundwater flow (Leake & Galloway, 2007). The program simulates groundwater storage changes and compaction in discontinuous interbeds or in extensive confining layers, accounting for stress-dependent changes in storage properties. This program especially, was developed to be a compatible package for MODFLOW, the U.S. Geological Survey modular finite-difference groundwater flow model. Several features of the program make it useful for application in shallow, unconfined flow systems. Geostatic stress can be treated as a function of water-table elevation, and compaction is a function of computed changes in effective stress at the bottom of a model layer. Thickness of compressible sediments in an unconfined model layer can vary in proportion to saturated thickness.
A dynamic model of water resources management using the scenario analysis technique in downstream of the Zayandehroud basin
Published in International Journal of River Basin Management, 2019
Azadeh Ahmadi, Sayed Ali Ohab-Yazdi, Nima Zadehvakili, Hamid Reza Safavi
MODFLOW was used for modelling groundwater systems due to high capability, different sub-models, and its ability for simulating the interactions between river flows and aquifers. Groundwater modelling is required because WEAP simulates the aquifer as a water reservoir (lumped) neglecting details such as the surface and groundwater interactions. To overcome this modelling inadequacy, a dynamic link was made in this study between the WEAP and the MODFLOW models and water table fluctuations were accurately presented.