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Research Centers: Recent submissions
Now showing items 201-220 of 241
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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 ... -
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 ... -
Evaluation of the applicability of the dual-domain mass transfer model in porous media containing connected high-conductivity channels
(American Geophysical Union, 2007-12-20)[1] This paper evaluates the dual-domain mass transfer (DDMT) model to represent transport processes when small-scale high-conductivity (K) preferential flow paths (PFPs) are present in a homogenous porous media matrix. ... -
Stochastic uncertainty analysis for solute transport in randomly heterogeneous media using a Karhunen-Loève-based moment equation approach
(American Geophysical Union, 2007-07-18)[1] A new approach has been developed for solving solute transport problems in randomly heterogeneous media using the Karhunen-Loève-based moment equation (KLME) technique proposed by Zhang and Lu (2004). The KLME approach ... -
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 ... -
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 ... -
Branchinecta hiberna, a new species of fairy shrimp (Crustacea: Anostraca) from western North America
(Brigham Young University, Monte L Bean Life Science Museau, 2001)Branchinecta hiberna, a new species of fairy shrimp, is described from temporary pools in the Great Basin region of south central Oregon, northeastern California, and adjacent Nevada. The new species shares several characters ... -
Geostatistical analysis of centimeter-scale hydraulic conductivity variations at the MADE site
(American Geophysical Union, 2012-02-21)[1] Spatial variations in hydraulic conductivity (K) provide critical controls on solute transport in the subsurface. Recently, new direct-push tools were developed for high-resolution characterization of K variations in ... -
Reply to comment by J.-P. Renaud et al. on “An assessment of the tracer-based approach to quantifying groundwater contributions to streamflow”
(Wiley [Commercial Publisher], 2007-09-22) -
A new method for high-resolution characterization of hydraulic conductivity
(American Geophysical Union, 2009-08-29)[1] A new probe has been developed for high-resolution characterization of hydraulic conductivity (K) in shallow unconsolidated formations. The probe was recently applied at the Macrodispersion Experiment (MADE) site in ... -
A Stochastic Analysis of Pumping Tests in Laterally Nonuniform Media
(American Geophysical Union, 1991-09)Conventional pumping test analysis methodology assumes that aquifer transmissivity is invariant in space. The ramifications of this assumption are examined for hypothetical units whose variations in transmissivity are ... -
Importance of a sound hydrologic foundation for assessing the future of the High Plains Aquifer in Kansas
(National Academy of Sciences, 2014-01-27)Steward et al. (1) assess the hydrologic and agricultural future of the High Plains Aquifer. We have many concerns about hydrologic aspects of their study and describe the most significant here. The authors state “…the ... -
Atypical Response Regulator ChxR from Chlamydia trachomatis Is Structurally Poised for DNA Binding
(Public Library of Science, 2014-03-19)ChxR is an atypical two-component signal transduction response regulator (RR) of the OmpR/PhoB subfamily encoded by the obligate intracellular bacterial pathogen Chlamydia trachomatis. Despite structural homology within ... -
Integrate the Mitochondrial Genome into the Nuclear Genome
(OMICS International, 2012-03-09)The mitochondrion is not an ideal location for storing genetic information. Evolution has relocated most of the mitochondrial genome to the nucleus. Transferring all remaining mitochondrial DNA to the nucleus might be an ... -
Broad-Spectrum Antivirals against 3C or 3C-Like Proteases of Picornaviruses, Noroviruses, and Coronaviruses
(American Society for Microbology, 2012-08-22)Phylogenetic analysis has demonstrated that some positive-sense RNA viruses can be classified into the picornavirus-like supercluster, which includes picornaviruses, caliciviruses, and coronaviruses. These viruses possess ... -
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 ...