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This data release contains three groundwater-flow models of northeastern Wisconsin, USA, that were developed with differing levels of complexity to provide a framework for subsequent evaluations of the effects of process-based model complexity on estimates of groundwater age distributions for withdrawal wells and streams. Preliminary assessments, which focused on the effects of model complexity on simulated water levels in the glacial aquifer system, illustrate that simulation of vertical gradients using multiple model layers improves simulated heads more in relatively low-permeability units than in high-permeability units. Moreover, simulation of heterogeneous hydraulic conductivity fields in both coarse-grained...
Tags: Fox-Wolf-Peshtigo watersheds,
Glacial Aquifer,
Groundwater,
Groundwater Model,
InlandWaters, All tags...
MODFLOW-NWT,
NSDI,
USGS Science Data Catalog (SDC),
Wisconsin,
environment,
geoscientificInformation,
inlandWaters,
usgsgroundwatermodel, Fewer tags
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A new groundwater flow model for western Chippewa County, Wisconsin has been developed by the Wisconsin Geological and Natural History Survey (WGNHS) and the U.S. Geological Survey (USGS). An analytic element GFLOW model was constructed and calibrated to generate hydraulic boundary conditions for the perimeter of the more detailed three-dimensional MODFLOW-NWT model. This three-dimensional model uses the USGS MODFLOW-NWT finite difference code, a standalone version of MODFLOW-2005 that incorporates the Newton (NWT) solver. The model conceptualizes the hydrogeology of western Chippewa County as a six-layer system which includes several hydrostratigraphic units. The model explicitly simulates groundwater-surface-water...
Tags: Chippewa County,
Groundwater,
Groundwater Model,
InlandWaters,
MNW2, All tags...
MODFLOW-NWT,
NSDI,
SWB,
USGS Science Data Catalog (SDC),
Wisconsin,
environment,
geoscientificInformation,
inlandWaters,
usgsgroundwatermodel, Fewer tags
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A GFLOW model was constructed of the Park Falls Unit as part of a larger study of the Chequamegon-Nicolet National Forest. The model supports the goals of the project by providing improved characterization of the groundwater/surface-water system and a tool to evaluate the sensitivity of hydrologic flows and temperature to future climate and land use changes.
Tags: Ashland County,
Chequamegon-Nicolet National Forest,
GFLOW,
Groundwater,
Groundwater Model, All tags...
InlandWaters,
Iron County,
NSDI,
Oneida County,
PEST,
Park Falls Unit,
Precambrian bedrock,
Price County,
Soil-Water-Balance Code,
USGS Science Data Catalog (SDC),
Vilas County,
Wisconsin,
environment,
geoscientificInformation,
inlandWaters,
usgsgroundwatermodel, Fewer tags
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A MODFLOW-NWT groundwater flow model was developed to simulate groundwater movement in the area around Anvil Lake, and groundwater inputs and outputs from the lake from 1980 to 2014. Surface-water hydrology was simulated using the lake package. The MODFLOW model was first calibrated for steady-state conditions, or "average" conditions corresponding to January 1, 1980, to December 31, 2014 to estimate spatial hydrogeologic properties. Following the steady-state calibration, the model was applied in transient mode to estimate average monthly hydrologic conditions (groundwater inputs and outputs) for each year from 1980 to 2014.
Tags: Anvil Lake,
Forest County,
Groundwater,
Groundwater Model,
InlandWaters, All tags...
LAK,
MODFLOW-NWT,
NSDI,
Oneida County,
PEST,
Soil-Water-Balance Code,
USGS Science Data Catalog (SDC),
Vilas County,
Wisconsin,
environment,
geoscientific Information,
inlandWaters,
usgsgroundwatermodel, Fewer tags
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The model simulates two-dimensional groundwater flow and base flow in streams in the northern Nicolet Unit of the Chequamegon-Nicolet National Forest using the analytic element program GFLOW (Haitjema, 1995). Significant streams and lakes in the model domain are represented at varying levels of detail as linesink elements fully connected to the groundwater system. The highest level of detail is given to surface water features within the Forest Unit, while greatly simplified features around the perimeter of the model provide a boundary condition for the groundwater flow system. Groundwater discharge to the linesinks is computed, and routed through the surface water network as base flow. Recharge to the groundwater...
Tags: Chequamegon-Nicolet National Forest,
Copper Falls Formation,
Eagle River--Florence District,
Forest County,
GFLOW, All tags...
Groundwater,
Groundwater Model,
InlandWaters,
Lakewood--Laona DistrictFlorence County,
NSDI,
Nicolet Unit,
Oneida County,
PEST,
Soil-Water-Balance Code,
USGS Science Data Catalog (SDC),
Vilas County,
Wisconsin,
environment,
geoscientificInformation,
inlandWaters,
usgsgroundwatermodel, Fewer tags
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