Search Results - "Schaap, M. G"

Development of Pedotransfer Functions for Estimation of Soil Hydraulic Parameters using Support Vector Machines by Twarakavi, Navin K.C, Simunek, Jirka, Schaap, M.G

“…Modeling flow in variably saturated porous media requires reliable estimates of the hydraulic parameters describing the soil water retention and hydraulic…”
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Anisotropic statistical scaling of soil and sediment texture in a stratified deep vadose zone near Maricopa, Arizona by Guadagnini, A., Neuman, S.P., Schaap, M.G., Riva, M.

“…We analyze the statistical scaling properties of vertical and horizontal increments in soil and sediment texture data measured to a depth of 15m over an area…”
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Description of the unsaturated soil hydraulic database UNSODA version 2.0 by Nemes, A, Schaap, M. G, Leij, F. J, Wösten, J. H. M

“…Quantifying water flow and chemical transport in the vadose zone typically requires knowledge of the unsaturated soil hydraulic properties. The UNsaturated…”
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Functional Evaluation of Pedotransfer Functions Derived from Different Scales of Data Collection by Nemes, A., Schaap, M. G., Wösten, J. H. M.

“…Estimation of soil hydraulic properties by pedotransfer functions (PTFs) can be an alternative to troublesome and expensive measurements. New approaches to…”
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Improved Prediction of Unsaturated Hydraulic Conductivity with the Mualem‐van Genuchten Model by Schaap, Marcel G., Leij, Feike J.

“…In many vadose zone hydrological studies, it is imperative that the soil's unsaturated hydraulic conductivity is known. Frequently, the Mualem–van Genuchten…”
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On the effective measurement frequency of time domain reflectometry in dispersive and nonconductive dielectric materials by Robinson, D.A, Schaap, M.G, Or, D, Jones, S.B

“…Time domain reflectometry (TDR) is one of the most commonly used techniques for water content determination in the subsurface. The measurement results in a…”
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Calibration of capacitance probe sensors using electric circuit theory by Kelleners, T.J, Soppe, R.W.O, Robinson, D.A, Schaap, M.G, Ayars, J.E, Skaggs, T.H

“…Capacitance probe sensors are an attractive electromagnetic technique for estimating soil water content. There is concern, however, about the influence of soil…”
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Measurement and Modeling of the TDR Signal Propagation through Layered Dielectric Media by Schaap, M. G., Robinson, D. A., Friedman, S. P., Lazar, A.

“…Layered dielectric materials are often encountered in the natural environment due to differences in water content caused either by a wetting or drying front…”
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Spatial variability of throughfall water and chemistry and forest floor water content in a Douglas fir forest stand by Raat, K. J., Draaijers, G. P. J., Schaap, M. G., Tietema, A., Verstraten, J. M.

“…This study focuses on spatial variability of throughfall water and chemistry and forest floor water content within a Douglas fir (Pseudotsuga menziesii, Franco…”
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Anisotropic statistical scaling of vadose zone hydraulic property estimates near Maricopa, Arizona by Guadagnini, A., Neuman, S. P., Schaap, M. G., Riva, M.

“…Fluid flow and mass transport in the vadose zone are strongly influenced by spatial variability in soil hydraulic properties. It has become common to…”
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Calibration of Hydra Impedance Probes using Electric Circuit Theory by Kelleners, T.J, Ferre-Pikal, E.S, Schaap, M.G, Paige, G.B

“…Impedance probes are an attractive electromagnetic technique to measure water content and bulk electrical conductivity (EC) in the same volume of soil. In this…”
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Saturated hydraulic conductivity prediction from microscopic pore geometry measurements and neural network analysis by Lebron, I., Schaap, M. G., Suarez, D. L.

“…Traditional models to describe hydraulic properties in soils are constrained by the assumption of cylindrical capillarity to account for the geometry of the…”
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Using an inverse method to estimate the hydraulic properties of crusted soils from tension-disc infiltrometer data by Šimůnek, Jiřı́, Angulo-Jaramillo, Rafael, Schaap, Marcel G., Vandervaere, Jean-Pierre, van Genuchten, Martinus Th

“…An inverse procedure was used to estimate the soil hydraulic characteristics of a two-layered soil system—soil surface crust and subsoil—from data obtained…”
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rosetta : a computer program for estimating soil hydraulic parameters with hierarchical pedotransfer functions by Schaap, Marcel G., Leij, Feike J., van Genuchten, Martinus Th

“…Soil hydraulic properties are necessary for many studies of water and solute transport but often cannot be measured because of practical and/or financial…”
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Model comparison of flow through a municipal solid waste incinerator ash landfill by Johnson, C.A., Schaap, M.G., Abbaspour, K.C.

“…The drainage discharge of a municipal solid waste incinerator (MSWI) bottom ash landfill was simulated using various modelling approaches. Two functional…”
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Pedotransfer functions for solute transport parameters of Portuguese soils by Gonc˛alves, M. C., Leij, F. J., Schaap, M. G.

“…Summary The purpose of this study is to quantify solute transport parameters of fine‐textured soils in an irrigation district in southern Portugal and to…”
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Soil pore size and geometry as a result of aggregate-size distribution and chemical composition by LEBRON, I, SUAREZ, D. L, SCHAAP, M. G

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Solute transport modeled with Green's functions with application to persistent solute sources by Leij, Feike J., Priesack, Eckart, Schaap, Marcel G.

“…Analytical models can be valuable tools to investigate solute transport in porous media. The application of analytical solutions is limited by the perception…”
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Forest floor water content dynamics in a Douglas fir stand by Schaap, M.G., Bouten, W., Verstraten, J.M.

“…This paper considers the hydrology of the forest floor within a homogeneous Douglas fir forest. Time domain reflectometry measurements show that forest floor…”
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Calibration of Capacitance Probe Sensors using Electric Circuit Theory by Kelleners, T. J., Soppe, R. W. O., Robinson, D. A., Schaap, M. G., Ayars, J. E., Skaggs, T. H.

“…Capacitance probe sensors are an attractive electromagnetic technique for estimating soil water content. There is concern, however, about the influence of soil…”
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