The Texas A&amp;M University Brazos River Hydrogeologic Field Site

Munster, C. L.; Mathewson, Christopher C.; Wrobleski, Christine Lynn

doi:10.2113/gseegeosci.ii.4.517

Cited by 12 publications

(7 citation statements)

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“…It is evident that low levels of viruses were present in the effluent for extended periods of time, suggesting that under natural conditions, low levels of virus particles may be present in pore waters (as a result of desorption) even after a particular point source of contamination ceases to exist. The Brazos Alluvium aquifer material that was used in these studies had pH values that ranged between 6.9 and 7.1 (21,28). This suggests that a virus particle's net negative charge on its surface increases as its isoelectric point decreases from the ambient pH.…”

Section: Resultsmentioning

confidence: 99%

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Delineating the Specific Influence of Virus Isoelectric Point and Size on Virus Adsorption and Transport through Sandy Soils

Dowd¹,

Pillai²,

Wang

et al. 1998

Appl Environ Microbiol

224

118

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Many of the factors controlling viral transport and survival within the subsurface are still poorly understood. In order to identify the precise influence of viral isoelectric point on viral adsorption onto aquifer sediment material, we employed five different spherical bacteriophages (MS2, PRD1, Qβ, φX174, and PM2) having differing isoelectric points (pI 3.9, 4.2, 5.3, 6.6, and 7.3 respectively) in laboratory viral transport studies. We employed conventional batch flowthrough columns, as well as a novel continuously recirculating column, in these studies. In a 0.78-m batch flowthrough column, the smaller phages (MS2, φX174, and Qβ), which had similar diameters, exhibited maximum effluent concentration/initial concentration values that correlated exactly with their isoelectric points. In the continuously recirculating column, viral adsorption was negatively correlated with the isoelectric points of the viruses. A model of virus migration in the soil columns was created by using a one-dimensional transport model in which kinetic sorption was used. The data suggest that the isoelectric point of a virus is the predetermining factor controlling viral adsorption within aquifers. The data also suggest that when virus particles are more than 60 nm in diameter, viral dimensions become the overriding factor.

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Section: Resultsmentioning

confidence: 99%

“…Sediment and groundwater were obtained from a previously well-studied sandy aquifer (95% sand, 7% silt, 2% clay) underlying the Brazos Alluvium (Burleson County, Tex.) (21,28). The aquifer sediment had a pH of 7.1.…”

Section: Methodsmentioning

confidence: 99%

Delineating the Specific Influence of Virus Isoelectric Point and Size on Virus Adsorption and Transport through Sandy Soils

Dowd¹,

Pillai²,

Wang

et al. 1998

Appl Environ Microbiol

224

118

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“…We expect our series solution to be useful, for example, for validating early time solutions by numerical models so that the latter can then be applied to more complex geometries. Indeed, situations where

H_{0} \neq 0

are quite common in field data [ Munster et al ., ; Serrano and Workman , ; Barlow et al ., ; Peterson and Connelly , ; Langhoff et al ., ; Ha et al ., ; Sena and de Melo , ], but up to now, to the best of our knowledge, analytical solutions applicable to these cases were not available.…”

Section: Series Solutionmentioning

confidence: 99%

A semianalytical solution for the Boussinesq equation with nonhomogeneous constant boundary conditions

Dias

Chor

Zárate

2014

Water Resources Research

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The Boussinesq groundwater equation is widely used in hydrology to predict streamflow from an unconfined aquifer and derive the aquifer's saturated hydraulic conductivity and drainable porosity, and to predict water table height in drainage engineering. In this work, we solve this equation in an unconfined horizontal aquifer for nonhomogeneous boundary conditions for the water table height. The solution is found in the form of a Taylor series that has a finite radius of convergence, which is different for each initial condition. We also present an expression for the flux boundary condition at the origin as a function of the depth of the adjoining stream that automatically satisfies the boundary condition at infinity, and thus eliminates the need for a trial-and-error approach for the solution, which is accurate to 10 27 . In order to obtain an approximation for the water table height in the region where the series solution diverges, first we computed a diagonal Pad e approximation from the series coefficients, which converges in a larger interval than the series, and then we matched it with a new asymptotic approximation for large values of the independent variable. We found that the proposed matched solution is better suited to cases where the water head at the origin is close to the initial water head in the aquifer.

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“…However, often the value of H 0 is not small enough in comparison with H in order for this approximation to be valid (Munster et al, 1996;Serrano and Workman, 1998;Barlow et al, 2000;Peterson and Connelly, 2001;Langhoff et al, 2006;Ha et al, 2008;Sena and de Melo, 2012). In these cases the misplaced assumption could lead to biased estimates of k 0 and n e .…”

Section: Generalization Of the Early-time Equationmentioning

confidence: 99%

Technical Note: A simple generalization of the Brutsaert and Nieber analysis

Chor

Dias

2015

Hydrol. Earth Syst. Sci.

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Abstract. The Brutsaert and Nieber (1977) analysis is a wellknown method that can estimate soil parameters given discharge data for some aquifers. It has been used for several cases where the observed late-time behavior of the recession suggests that the water stream that is adjacent to the aquifer has nonzero depth. However, its mathematical formulation is, strictly speaking, not capable of reproducing these real-case scenarios since the early time behavior is based on a solution for which the aquifer stream has zero depth (PolubarinovaKochina, 1962). We propose a simple generalization for the Brutsaert and Nieber (1977) method that takes into consideration the depth of the adjacent water stream. The generalization is based on already available solutions by PolubarinovaKochina (1962), Chor et al. (2013) and Dias et al. (2014) and can be readily implemented with little effort. The original and proposed equations are tested against numerical simulations of the full nonlinear Boussinesq equation. A sensitivity analysis shows that the modification can have significant impact on the predicted values of both the drainable porosity and the saturated hydraulic conductivity.

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The Texas A&M University Brazos River Hydrogeologic Field Site

Cited by 12 publications

References 0 publications

Delineating the Specific Influence of Virus Isoelectric Point and Size on Virus Adsorption and Transport through Sandy Soils

Delineating the Specific Influence of Virus Isoelectric Point and Size on Virus Adsorption and Transport through Sandy Soils

A semianalytical solution for the Boussinesq equation with nonhomogeneous constant boundary conditions

Technical Note: A simple generalization of the Brutsaert and Nieber analysis

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