Index Catalog // ScholarsArchive@OSU

Creator:: Benítez‐Buelga, Javier, Rodríguez‐Sinobas, Leonor, Sánchez Calvo, Raul, Gil‐Rodríguez, Maria, Sayde, Chadi, and Selker, John S.
Abstract:: The heat pulse probe method can be implemented with actively heated fiber optics (AHFO) to obtain distributed measurements of soil water content (θ) by using reported soil thermal responses measured by Distributed Temperature Sensing (DTS) and with a soil-specific calibration relationship. However, most reported applications have been calibrated to homogeneous...
Resource Type:: Article
Full Text:: , Leonor Rodr�ıguez-Sinobas1,2, Raul S�anchez Calvo1, Mar�ıa Gil-Rodr�ıguez1, Chadi Sayde3, and John S

Creator:: Selker, John S. and Schroth, Martin H.
Abstract:: The use of dimensionless scaling is ubiquitous to hydrodynamic analysis, providing a powerful method of extending limited experimetnal results and generalizing theories. Miller and Miller [1956] contributed a scaling framework for immiscible fluid flow through porous media that relied on consistency of the contact angle between systems to be compared....
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Full Text:: of hydrodynamic scaling in porous media using finger dimensions John S. Selker Department of

Creator:: Rupp, David E. and Selker, John S.
Abstract:: Solutions to the Boussinesq equation describing drainage into a fully penetrating channel have been used for aquifer characterization. Two analytical solutions exist for early- and late-time drainage from a saturated, homogeneous, and horizontal aquifer following instantaneous drawdown. The solutions for discharge Q can be expressed as dQ/dt = −aQ [superscript...
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Full Text:: hydraulic conductivity profile David E. Rupp and John S. Selker Department of Bioengineering, Oregon State

Creator:: Brandi-Dohrn, Florian M., Dick, Richard P., Hess, Mario, and Selker, John S.
Abstract:: An accurate assessment of leaching losses in the vadose zone requires measurement of both solute and water flux to compute flux concentrations (C[subscript F]). Leachate collected at a depth of 1.2 m in 32 passive capillary samplers (PCAPS), which sample soil-pore water continuously at tensions of 0–50 cm H₂O was...
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Full Text:: Hess and John S. Selker Department of Bioresource Engineering, Oregon State University, Corvallis

Creator:: Niemet, Michael R., Rockhold, Mark L., Weisbrod, Noam, and Selker, John S.
Abstract:: Liquid saturation and gas-liquid interfacial area are important parameters for evaluating the transport and fate of contaminants in unsaturated subsurface environments. Recent findings indicate that interfacial surface area controls the relative degree of transmitted light in laboratory systems containing translucent porous media. Equations are derived to estimate the specific gas-liquid...
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Full Text:: saturated porous media Michael R. Niemet,1,2 Mark L. Rockhold,1,3 Noam Weisbrod,1,4 and John S. Selker1

Creator:: Rupp, David E. and Selker, John S.
Abstract:: The method of recession analysis proposed by Brutsaert and Nieber (1977) remains one of the few analytical tools for estimating aquifer hydraulic parameters at the field scale and beyond. In the method, the recession hydrograph is examined as −dQ/dt = f(Q), where Q is aquifer discharge and f is an...
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Full Text:: recession hydrographs from sloping aquifers David E. Rupp1,2 and John S. Selker1 Received 2 April 2006

Creator:: Ferre, Ty P. A. and Selker, John S.
Abstract:: A new apparatus is presented that is capable of applying a constant fluid pressure at inflow and outflow boundaries. The apparatus can be refilled during operation and does not rely on an overflow mechanism. The device is constructed of two vessels, one that contains the delivered fluid and the other...
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Full Text:: Wales apparatus to apply constant head boundary conditions Ty P. A. Ferre1 and John S. Selker2

Creator:: Selker, John S. and Rupp, David E.
Abstract:: Quality concerns drive many water studies and practices, but obtaining samples from water bodies over time and space for quality determination is often difficult and expensive. We present a low-cost approach that allows integration of water samples over timescales of days to months to allow more widely distributed acquisition of...
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Full Text:: sampler An environmentally driven time-integrating water sampler John S. Selker and David E. Rupp

Creator:: Selker, John S. and Haith, Douglas A.
Abstract:: Distributed temperature data are used as input and as calibration data for an energy based temperature model of a first order stream in Luxembourg. A DTS (Distributed Temperature Sensing) system with a fiber optic cable of 1500m was used to measure stream water temperature with 1m resolution each 2 min....
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Full Text:: Development and Testing of Single-Parameter Precipitation Distributions JOHN S. SELKER AND DOUGLAS A. HAITH

Creator:: Selker, John S., Duan, Jinfan, and Parlange, Jean-Yves
Abstract:: Most expressions for infiltration rely upon the assumption of vertical uniformity in soil texture and hydraulic properties. We present an extension of the results of Beven [1982, 1984] for infiltration and lateral flow in soils with decreasing permeability with depth. Unlike Beven, we base the derivations upon joint changes in...
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Full Text:: infiltration into soils of variable pore size with depth John S. Selker Department of Bioresource

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