Search Results - "Schaap, M.G."

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…”
Get full text

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…”
Get full text

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…”
Get full text

Can texture‐based classification optimally classify soils with respect to soil hydraulics? by Twarakavi, Navin K.C, Simunek, Jirka, Schaap, M.G

“…In the past, texture‐based classification of soils has been used for grouping soils in variably saturated water flow and solute transport studies…”
Get full text

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…”
Get full text

Comparison of pressure-saturation characteristics derived from computed tomography and lattice Boltzmann simulations by Schaap, M.G, Porter, M.L, Christensen, B.S.B, Wildenschild, D

“…A Shan‐Chen–type multiphase lattice Boltzmann (LB) model was applied to observed computed microtomography data from water‐air and water‐Soltrol displacement…”
Get full text

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…”
Get full text

Database-related accuracy and uncertainty of pedotransfer functions by Schaap, M.G. (USDA-ARS, U.S. Salinity Laboratory, Riverside, CA.), Leij, F.J

Get full text

Topographical attributes to predict soil hydraulic properties along a hillslope transect by Leij, F.J, Romano, N, Palladino, M, Schaap, M.G, Coppola, A

“…Basic soil properties have long been used to predict unsaturated soil hydraulic properties with pedotransfer function (PTFs). Implementation of such PTFs is…”
Get full text

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…”
Get full text

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…”
Get full text

Soil hydraulic properties near saturation, an improved conductivity model by Børgesen, Christen D., Jacobsen, Ole H., Hansen, Søren, Schaap, Marcel G.

“…The hydraulic properties near saturation can change dramatically due to the presence of macropores that are usually difficult to handle in traditional pore…”
Get full text

Using microscope observations of thin sections to estimate soil permeability with the Kozeny-Carman equation by Schaap, M.G, Lebron, I

“…In this study we used the Kozeny-Carman (K-C) equation as a semi-physical model for estimating the soil permeability using data derived from microscope…”
Get full text

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…”
Get full text

Forest floor evaporation in a dense Douglas fir stand by Schaap, M.G, Bouten, W

“…Forest floor evaporation was measured with an accurate weighing lysimeter during 44 days in early spring and summer. The Penman–Monteith approach was used to…”
Get full text

Analysing forest transpiration model errors with artificial neural networks by Dekker, Stefan C., Bouten, Willem, Schaap, Marcel G.

“…A Single Big Leaf (SBL) forest transpiration model was calibrated on half-hourly eddy correlation measurements. The SBL model is based on the Penman–Monteith…”
Get full text

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…”
Get full text

Electrical properties cup (EPC) for characterizing water content of martian and lunar soils by Buehler, M.G., Bostic, H., Chin, K.B., McCann, T., Keymeulen, D., Anderson, R.C., Seshadri, S., Schaap, M.G.

“…In this effort we used electrical impedance spectroscopy and a four-probe apparatus, the electrical properties cup (EPC), to measure the properties of various…”
Get full text

Prospecting for in situ resources on the Moon and Mars using wheel-based sensors by Buehler, M.G., Anderson, R.C., Seshadri, S., Schaap, M.G.

“…The Apollo and Russian missions during 1970s were reviewed to rediscover the type and distribution of minerals on the Moon. This study revealed that the Moon…”
Get full text

Monitoring and modelling canopy water storage amounts in support of atmospheric deposition studies by Bouten, Willem, Schaap, Marcel G., Aerts, Jeroen, Vermetten, Aart W.M.

“…Canopy water storage amounts were measured with a newly developed measuring system based on the attenuation of a 10.26 GHz microwave signal. Every 5 min,…”
Get full text