Plan of study for the northern Midwest regional aquifer-system analysis

Steinhilber, W. L.; Young, H. L.

doi:10.3133/wri7944

1979

DOI: 10.3133/wri7944

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Plan of study for the northern Midwest regional aquifer-system analysis

W. L. Steinhilber¹,

H. L. Young²

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Data-base system for northern Midwest regional aquifer-system analysis

Kontis¹,

Mandle²

1980

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A computerized database system was developed to facilitate collection and use of large quantities of data for a model study of the Cambrian-Ordovician aquifer system in the Northern Midwest. Input to the database system consists of either point values or digitized contour maps of hydrogeologic data required by the model. Uniformly spaced model-node values are then computed from the discrete data by two-dimensional interpolation. Nonuniformly-spaced modal values may be obtained by fitting two-dimensional polynomials (bicubic splines) to surfaces formed by uniformly spaced points and solving for the surface values at the node locations. The database system has the following attributes: 1) manual handling of data is minimized and machine handling of data is maximized, 2) given unequally spaced point data over the extent of the study area, model input arrays for any reasonable uniform node spacing can be rapidly computed, 3) accuracy of computed node values are generally compatible with accuracy and spatial distribution of point data, 4) a relatively large class of nonuniformly spaced node configurations can be computed, 5) data within files can be easily accessed and edited, and 6) the occurrence of data processing errors at various stages of database generation is monitored by machine contouring the computed grids.

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Data-base system for northern Midwest regional aquifer-system analysis

Kontis¹,

Mandle²

1980

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Modifications of a three-dimensional ground-water flow model to account for variable water density and effects of multiaquifer wells

Kontis¹,

Mandle²

1988

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A three-dimensional finite-difference groundwater flow model was modified and used in the U.S. Geological Survey's Northern Midwest Regional Aquifer System Analysis to simulate the effects of wells open to various combinations of aquifers and the effects of groundwater density that varies spatially but is time invariant. The computer code for the slice-successive-over-relaxati^on solution method used to solve for head and a description of how it functions is given, as well as modifications that were made to account for the hydraulic effects of multiaquifer-wells. In addition, two programs are presented that compute data required for the simulation of variable-density effects: one program calculates model-block conductances and variable-density terms external to the groundwater flow model; the other computes groundwater and pure-water density and viscosity for input to the first program.

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Plan of study for the northern Midwest regional aquifer-system analysis

Cited by 2 publications

References 2 publications

Data-base system for northern Midwest regional aquifer-system analysis

Data-base system for northern Midwest regional aquifer-system analysis

Modifications of a three-dimensional ground-water flow model to account for variable water density and effects of multiaquifer wells

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