Index Catalog // ScholarsArchive@OSU

Creator:: Selker, John S., Thevenaz, Luc, Huwald, Hendrik, Mallet, Alfred, Luxemburg, Wim, van de Giesen, Nick, Stejskal, Martin, Zeman, Josef, Westhoff, Martijn, and Parlange, Marc B.
Abstract:: Instruments for distributed fiber-optic measurement of temperature are now available with temperature resolution of 0.01°C and spatial resolution of 1 m with temporal resolution of fractions of a minute along standard fiber-optic cables used for communication with lengths of up to 30,000 m. We discuss the spectrum of fiber-optic tools...
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Full Text:: methods in hydrologic science. There are trade-offs between precision in temperature, temporal resolution

Creator:: Steele‐Dunne, S. C., Rutten, M. M., Krzeminska, D. M., Hausner, M., Tyler, S. W., Selker, J., Bogaard, T. A., and van de Giesen, N. C.
Abstract:: Through its role in the energy and water balances at the land surface, soil moisture is a key state variable in surface hydrology and land-atmosphere interactions. Point observations of soil moisture are easy to make using established methods such as time domain reflectometry and gravimetric sampling. However, monitoring large-scale variability...
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Full Text:: , measuring propagation of temperature changes due to the diurnal cycle. Current technology allows these

Creator:: Selker, John and Ferre, Ty P. A.
Abstract:: None
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Full Text:: question correctly is one of the primary goals of hydrologic science. We do this through development of

Creator:: Sayde, Chadi, Gregory, Christopher, Gil‐Rodriguez, Maria, Tufillaro, Nick, Tyler, Scott, van de Giesen, Nick, English, Marshal, Cuenca, Richard, and Selker, John S.
Abstract:: Accurate methods are needed to measure changing soil water content from meter to kilometer scales. Laboratory results demonstrate the feasibility of the heat pulse method implemented with fiber optic temperature sensing to obtain accurate distributed measurements of soil water content. A fiber optic cable with an electrically conductive armoring was...
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Full Text:: afforded many important opportunities in environmental monitoring [e.g., Selker et al., 2006a, 2006b; Tyler

Creator:: Yarwood, R. R., Rockhold, M. L., Niemet, M. R., Selker, J. S., and Bottomley, P. J.
Abstract:: A novel analytical method was developed that permitted real-time, noninvasive measurements of microbial growth and associated changes in hydrodynamic properties in porous media under unsaturated flowing conditions. Salicylate-induced, lux gene-based bioluminescence was used to quantify the temporal and spatial development of colonization over a 7-day time course. Water contents were...
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Full Text:: in subsurface environments is of great interest in the field of environmental protection. Many

Creator:: Stewart, Ryan D., Hut, Rolf, Rupp, David E., Gupta, Hoshin, and Selker, John S.
Abstract:: We propose a novel, accurate quantification of precipitation and evaporation, as needed to understand fundamental hydrologic processes. Our system uses a collection vessel placed on top of a slender rod that is securely fixed at its base. As the vessel is deflected, either by manual perturbation or ambient forcing (for...
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Full Text:: , Delft University of Technology, Delft, Netherlands. 3Oregon Climate Change Research Institute, College

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:: Department of Crop and Soil Science, Agricultural Life Sciences, Oregon State University, Corvallis Mario

Creator:: Assouline, S., Selker, J. S., and Parlange, J.-Y.
Abstract:: The prediction of the time to ponding following commencement of rainfall is fundamental to hydrologic prediction of flood, erosion, and infiltration. Most of the studies to date have focused on prediction of ponding resulting from simple rainfall patterns. This approach was suitable to rainfall reported as average values over intervals...
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Full Text:: resolution required for the accurate 1Institute of Environmental Science and Technology, School of

Creator:: Rupp, David E., Keim, Richard F., Ossiander, Mina, Brugnach, Marcela, and Selker, John S.
Abstract:: Multiplicative random cascades (MRCs) can parsimoniously generate highly intermittent patterns similar to those in rainfall. The elemental MRC model parameter is the cascade weight, which determines how rainfall at one scale is partitioned at the next smallest scale in the cascade. While it is known that the probability density of...
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Full Text:: Science and Technology through the program ‘‘Land Use Intensification: Sustain- able Management of Water

Creator:: Ochiai, Naoyuki, Kraft, Erika L., and Selker, John S.
Abstract:: Prediction of colloid transport in the subsurface is relevant to researchers in a variety of fields such as contaminant transport, wastewater treatment, and bioremediation. Investigations have traditionally relied on column studies whereby mechanistic inferences must be drawn on the basis of colloid behavior at the outlet. Over the past decade,...
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Full Text:: ; Silliman et al., 2001; Bradford et al., 2002; 1Department of Crop and Soil Science, Oregon State

ScholarsArchive@OSU