Kansas Geological Survey Scholarly Works: Recent submissions
Now showing items 21-40 of 41
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Spatial connectivity in a highly heterogeneous aquifer: From cores to preferential flow paths
(American Geophysical Union, 2011-05-19)[1] This study investigates connectivity in a small portion of the extremely heterogeneous aquifer at the Macrodispersion Experiment (MADE) site in Columbus, Mississippi. A total of 19 fully penetrating soil cores were ... -
Stochastic uncertainty analysis for unconfined flow systems
(American Geophysical Union, 2006-09-19)[1] A new stochastic approach proposed by Zhang and Lu (2004), called the Karhunen-Loeve decomposition-based moment equation (KLME), has been extended to solving nonlinear, unconfined flow problems in randomly heterogeneous ... -
Limits of applicability of the advection-dispersion model in aquifers containing connected high-conductivity channels
(American Geophysical Union, 2004-08-26)[1] The macrodispersion model from stochastic transport theory is demonstrated to be of limited utility when applied to heterogeneous aquifer systems containing narrow connected pathways. This is so even when contrasts in ... -
An assessment of the tracer-based approach to quantifying groundwater contributions to streamflow
(American Geophysical Union, 2006-02-18)[1] The use of conservative geochemical and isotopic tracers along with mass balance equations to determine the pre-event groundwater contributions to streamflow during a rainfall event is widely used for hydrograph ... -
Hydrologic response of catchments to precipitation: Quantification of mechanical carriers and origins of water
(American Geophysical Union, 2011-12-15)[1] Precipitation-induced overland and groundwater flow and mixing processes are quantified to analyze the temporal (event and pre-event water) and spatial (groundwater discharge and overland runoff) origins of water ... -
Sensitivity and resolution of tomographic pumping tests in an alluvial aquifer
(American Geophysical Union, 2009-02-14)[1] Various investigators have proposed hydraulic tomography, the simultaneous analysis of responses to multiple well tests, as a means to obtain a high-resolution characterization of aquifer flow properties. This study ... -
Steady shape analysis of tomographic pumping tests for characterization of aquifer heterogeneities
(American Geophysical Union, 2002-12-31)[1] Hydraulic tomography, a procedure involving the performance of a suite of pumping tests in a tomographic format, provides information about variations in hydraulic conductivity at a level of detail not obtainable with ... -
Variable-rate pumping tests for radially symmetric nonuniform aquifers
(American Geophysical Union, 1990-02)Conventional pumping test methodology is of limited effectiveness for defining the spatial distribution of aquifer properties because of the nonuniqueness of the parameter estimates. Sensitivity analysis can be used to ... -
Slug tests in partially penetrating wells
(American Geophysical Union, 1994-11)A semianalytical solution is presented to a mathematical model describing the flow of groundwater in response to a slug test in a confined or unconfined porous formation. The model incorporates the effects of partial ... -
Pumping tests in nonuniform aquifers: The radially asymmetric case
(American Geophysical Union, 1993-02)An analytical solution for the case of transient, pumping-induced drawdown in a nonuniform aquifer is presented. The nonuniform aquifer is conceptualized as a uniform matrix into which a disk of anomalous properties has ... -
Pumping tests in networks of multilevel sampling wells: Motivation and methodology
(American Geophysical Union, 1999-11)The identification of spatial variations in hydraulic conductivity (K) on a scale of relevance for transport investigations has proven to be a considerable challenge. Recently, a new field method for the estimation of ... -
Relative importance of dispersion and rate-limited mass transfer in highly heterogeneous porous media: Analysis of a new tracer test at the Macrodispersion Experiment (MADE) site
(American Geophysical Union, 2010-03-20)[1] A single-well injection-withdrawal (SWIW) bromide tracer test was conducted to further investigate transport processes at the Macrodispersion Experiment (MADE) site on Columbus Air Force Base in Mississippi. The bromide ... -
Simulation assessment of the direct-push permeameter for characterizing vertical variations in hydraulic conductivity
(American Geophysical Union, 2008-02-22)[1] The direct-push permeameter (DPP) is a tool for the in situ characterization of hydraulic conductivity (K) in shallow, unconsolidated formations. This device, which consists of a short screened section with a pair of ... -
A field assessment of the value of steady shape hydraulic tomography for characterization of aquifer heterogeneities
(American Geophysical Union, 2007-05-22)[1] Hydraulic tomography is a promising approach for obtaining information on variations in hydraulic conductivity on the scale of relevance for contaminant transport investigations. This approach involves performing a ... -
A field investigation of phreatophyte-induced fluctuations in the water table
(American Geophysical Union, 2007-02-07)[1] Hydrographs from shallow wells in vegetated riparian zones frequently display a distinctive pattern of diurnal water table fluctuations produced by variations in plant water use. A multisite investigation assessed the ... -
Estimation of groundwater consumption by phreatophytes using diurnal water table fluctuations: A saturated-unsaturated flow assessment
(American Geophysical Union, 2005-07-27)[1] Groundwater consumption by phreatophytes is a difficult-to-measure but important component of the water budget in many arid and semiarid environments. Over the past 70 years the consumptive use of groundwater by ... -
Hydraulic tests in highly permeable aquifers
(American Geophysical Union, 2004-12-04)[1] A semianalytical solution is presented for a mathematical model describing the flow of groundwater in response to a slug or pumping test in a highly permeable, confined aquifer. This solution, which is appropriate for ... -
Steady shape analysis of tomographic pumping tests for characterization of aquifer heterogeneities
(American Geophysical Union, 2002-12-31)[1] Hydraulic tomography, a procedure involving the performance of a suite of pumping tests in a tomographic format, provides information about variations in hydraulic conductivity at a level of detail not obtainable with ... -
Pumping-induced leakage in a bounded aquifer: An example of a scale-invariant phenomenon
(American Geophysical Union, 2003-12-05)[1] A new approach is presented for calculation of the volume of pumping-induced leakage entering an aquifer as a function of time. This approach simplifies the total leakage calculation by extending analytical-based methods ... -
Dynamic interpretation of slug tests in highly permeable aquifers
(American Geophysical Union, 2002-03-21)[1] Considerable progress has been made in developing a theoretical framework for modeling slug test responses in formations with high hydraulic conductivity K. However, several questions of practical significance remain ...