Inverse three-dimensional groundwater modeling using the finite-difference method for recharge estimation in a glacial till aquitard

dc.contributor.author Kanwar, Rameshwar
dc.contributor.author Ella, V. B.
dc.contributor.author Melvin, S. W.
dc.contributor.author Kanwar, R. S.
dc.contributor.author Jones, L. C.
dc.contributor.author Horton, Robert
dc.contributor.author Horton, R.
dc.contributor.department Agronomy
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-19T06:11:39.000
dc.date.accessioned 2020-06-29T23:04:10Z
dc.date.available 2020-06-29T23:04:10Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2002
dc.date.issued 2002-01-01
dc.description.abstract <p>Knowledge of groundwater recharge rates is essential for developing sustainable groundwater resources management schemes and for assessing the susceptibility of the groundwater system to contamination by leachable nutrients and toxic compounds such as nitrates and pesticides. This study was carried out to develop a method for estimating groundwater recharge in a glacial till aquitard using inverse groundwater modeling based on the USGS modular finite–difference groundwater model. The three–dimensional model incorporated the effects of the various hydrogeologic properties, such as hydraulic conductivity, specific yield, storage coefficient, and porosity, and hydrologic processes influencing recharge such as evapotranspiration and subsurface drainage. The model also accounted for the spatial variability of hydraulic conductivity in the oxidized and unoxidized layers based on geostatistical analysis. The groundwater model was calibrated and validated using years with adequate groundwater data. Inverse modeling was consequently performed using the calibrated model and simulation results yielded generally fair agreement between observed and calculated head distribution. Simulation results indicated that the annual net groundwater recharge for the five–year simulation period considered ranged from 18.7 mm/yr to 33.2 mm/yr, constituting approximately 2.3% to 4.3% of the annual precipitation in the area. The recharge estimates are within the typical range of recharge for the humid Midwest. The finite–difference model could serve as an alternative method for estimating groundwater recharge in a glacial till aquitard.</p>
dc.description.comments <p>This article is published as Ella, V. B., S. W. Melvin, R. S. Kanwar, L. C. Jones, R. Horton. 2002. Inverse three-dimensional groundwater modeling using the finite-difference method for recharge estimation in a glacial till aquitard. Transactions of the ASAE. Vol. 45(3): 703–715. doi: <a href="http://dx.doi.org/10.13031/2013.8829" target="_blank">10.13031/2013.8829</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/306/
dc.identifier.articleid 1310
dc.identifier.contextkey 11247507
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/306
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4650
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/306/2002_Horton_InverseThree.pdf|||Fri Jan 14 23:29:07 UTC 2022
dc.source.uri 10.13031/2013.8829
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Hydrology
dc.subject.keywords Groundwater modeling
dc.subject.keywords Finite–difference method
dc.subject.keywords Groundwater recharge
dc.subject.keywords Glacial till aquitard
dc.subject.keywords USGS–MODFLOW
dc.title Inverse three-dimensional groundwater modeling using the finite-difference method for recharge estimation in a glacial till aquitard
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 5210e67e-b8da-4e17-be3f-843a09381196
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