The History of MODFLOW

McDonald, Michael G.; Harbaugh, Arlen W.

doi:10.1111/j.1745-6584.2003.tb02591.x

Cited by 139 publications

(71 citation statements)

References 12 publications

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“…McDonald and Harbaugh (1988) required that the density of groundwater was constant. McDonald and Harbaugh (2003) identified other investigators involved in the development of the groundwater flow model described in McDonald and Harbaugh (1988).…”

Section: Discussionmentioning

confidence: 99%

Preliminary investigation of groundwater flow and trichloroethene transport in the Surficial Aquifer System, Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota

King¹,

Davis²

2016

Open-File Report

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Section: Discussionmentioning

confidence: 99%

Preliminary investigation of groundwater flow and trichloroethene transport in the Surficial Aquifer System, Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota

King¹,

Davis²

2016

Open-File Report

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“…The origins of MOD-FLOW can be traced back to the beginning of the 1980s. An overview on the history of MODFLOW is given by McDonald and Harbaugh (2003).…”

Section: Software Overviewmentioning

confidence: 99%

Numerical Models of Groundwater Flow and Transport

Holzbecher¹,

Sorek

2005

Encyclopedia of Hydrological Sciences

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The article gives an introduction to numerical modeling of flow and transport problems and to software tools that are currently in use for modeling such phenomena. Details are explained on numerical approximations leading to different numerical models. Extensions for reactive transport are mentioned. Basic guidelines and criteria are given that should be taken into account by the modeler in order to improve the accuracy of results. Inverse modeling is presented as an advanced feature. Some examples of pre‐ and postprocessing, as implemented in several codes, are given, in addition to fundamental properties of solution methods. Finally, most common codes are listed with basic features and web‐sites.

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“…Otherwise, system parameters including specific yield and streambed conductance and boundary conditions are the same for all simulations. All computations are conducted using the MODFLOW simulation environment (Leake and Prudic, 1991;McDonald and Harbaugh, 2003;Rodríguez et al, 2006).…”

Section: Experiments Setting and Model Developmentmentioning

confidence: 99%

“…Multi-physics models of the coupled hydrologic fluxes of the MHRB are implemented using the MODFLOW (Modular Three-dimensional Finite-difference Groundwater Flow Model) simulation environment (McDonald and Harbaugh, 2003). The PEST (parameter estimation) tool (Doherty et al, 1994) is used to calibrate an effective aquifer hydraulic conductivity for each of 16 zones within the MHRB.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear effects of locally heterogeneous hydraulic conductivity fields on regional stream–aquifer exchanges

Zhu

Winter

Wang

2015

Hydrol. Earth Syst. Sci.

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Abstract.Computational experiments are performed to evaluate the effects of locally heterogeneous conductivity fields on regional exchanges of water between stream and aquifer systems in the Middle Heihe River basin (MHRB) of northwestern China. The effects are found to be nonlinear in the sense that simulated discharges from aquifers to streams are systematically lower than discharges produced by a base model parameterized with relatively coarse effective conductivity. A similar, but weaker, effect is observed for stream leakage. The study is organized around three hypotheses: (H1) small-scale spatial variations of conductivity significantly affect regional exchanges of water between streams and aquifers in river basins, (H2) aggregating small-scale heterogeneities into regional effective parameters systematically biases estimates of stream-aquifer exchanges, and (H3) the biases result from slow paths in groundwater flow that emerge due to small-scale heterogeneities. The hypotheses are evaluated by comparing stream-aquifer fluxes produced by the base model to fluxes simulated using realizations of the MHRB characterized by local (grid-scale) heterogeneity. Levels of local heterogeneity are manipulated as control variables by adjusting coefficients of variation. All models are implemented using the MODFLOW (Modular Three-dimensional Finite-difference Groundwater Flow Model) simulation environment, and the PEST (parameter estimation) tool is used to calibrate effective conductivities defined over 16 zones within the MHRB. The effective parameters are also used as expected values to develop lognormally distributed conductivity (K) fields on local grid scales. Stream-aquifer exchanges are simulated with K fields at both scales and then compared. Results show that the effects of small-scale heterogeneities significantly influence exchanges with simulations based on local-scale heterogeneities always producing discharges that are less than those produced by the base model. Although aquifer heterogeneities are uncorrelated at local scales, they appear to induce coherent slow paths in groundwater fluxes that in turn reduce aquifer-stream exchanges. Since surface watergroundwater exchanges are critical hydrologic processes in basin-scale water budgets, these results also have implications for water resources management.

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The History of MODFLOW

Cited by 139 publications

References 12 publications

Preliminary investigation of groundwater flow and trichloroethene transport in the Surficial Aquifer System, Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota

Preliminary investigation of groundwater flow and trichloroethene transport in the Surficial Aquifer System, Naval Industrial Reserve Ordnance Plant, Fridley, Minnesota

Numerical Models of Groundwater Flow and Transport

Nonlinear effects of locally heterogeneous hydraulic conductivity fields on regional stream–aquifer exchanges

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