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Browsing by Subject Vadose Zone

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  • Filtering of Periodic Infiltration in a Layered Vadose Zone: 2. Applications and a Freeware Screening Tool

    • Authors: Dickinson, J.E.;  Advisor: -;  Participants: Ferré, T.P.A. (2018)

  • We have developed a screening tool to visualize and conceptualize the filtering properties of a layered vadose zone. Climate projections indicate that rainfall timing and magnitude may change and impact groundwater resources. This increases the importance of understanding how the vadose zone filters infiltration variability and ultimately affects recharge and groundwater resources. An approximate solution for the filtering of surface forcings through soil layers was developed previously, and the soil and conditions where its approximations are appropriate was evaluated. Here we present a screening tool based on the solution for estimating how periodic infiltration forcings filter in a...
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  • Lysimeters in Vadose Zone Research

    • Authors: Pütz, T.;  Advisor: -;  Participants: Fank, J.; Flury, M. (2018)

  • Lysimeters are methodological experimental tools to study the water and matter fluxes in the vadose zone, as well as the environmental fate of chemicals. Lysimeters are available in various types. The most sophisticated lysimeters are filled monolithically, are equipped with a pressure‐controlled lower boundary, and are weighable, allowing the measurement of hydraulic fluxes, i.e., rainfall, drainage, evapotranspiration, dew, and hoar frost with high precision. This special section of Vadose Zone Journal reports on current lysimeter research.
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  • Stable Isotope Approaches in Vadose Zone Research

    • Authors: Stumpp, C.;  Advisor: -;  Participants: Brüggemann, N.; Wingate, L. (2018)

  • Recent developments in the measurement, modeling, and application of stable isotope tools to provide insights on water flow, transport, biogeochemical, and ecological processes in the vadose zone have motivated a special section in Vadose Zone Journal. We give an overview of recent advances and challenges in stable isotope approaches in the vadose zone and present the key findings from the five manuscripts in this special section. These five manuscripts advance our understanding of (i) analytical developments in water stable isotope analysis, (ii) modeling of water and transport within the soil matrix using water stable isotopes, and (iii) using compound‐specific isotope analysis for ...
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  • Undrained Shear Strength of Unsaturated Soils under Zero or Low Confining Pressures in the Vadose Zone

    • Authors: Oh, T.W.;  Advisor: -;  Participants: Vanapalli, S. (2018)

  • In geotechnical engineering practice, many projects such as stability analysis of slopes or trenches and pavement design involve soils in vadose zones at shallow depths, where soils are under unsaturated conditions. For these types of projects, undrained shear strength test results obtained under zero or low confining pressure can be effectively used to analyze the behaviors of unsaturated soils. Experimental procedures to determine the undrained shear strength for different soil suction values, however, is time consuming even under low confining pressure. For this reason, we attempted to develop a semi‐empirical model to predict the undrained shear strength of unsaturated soils at a ...
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  • UZIG Research: Measurement and Characterization of Unsaturated Zone Processes under Wide‐Ranging Climates and Changing Conditions

    • Authors: Trost, J.J.;  Advisor: -;  Participants: Perkins, K.S.; Henson, W.; Mirus, B.B.; Nimmo, J.R.; Muñoz-Carpena, R. (2018)

  • We summarize key findings from 14 papers, several of which originated from a meeting convened by UZIG in 2017 at the University of Florida in Gainesville titled “Land‐Use Change, Climate Change, and Hydrologic Extremes: Unsaturated Zone Responses and Feedbacks.” This special section of Vadose Zone Journal contains multidisciplinary research in three general categories relevant to measuring and understanding unsaturated zone responses to changing land uses and climate: (i) unsaturated zone properties and processes; (ii) soil–plant–atmosphere interactions; and (iii) novel field sampling devices. A strong cross‐cutting theme in these papers is the value of continuous monitoring data and ...