Vadose Zone Journal

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Water Retention Characteristics and Pore Structure of Binary Mixtures
Vadose Zone Journal - Tập 14 Số 2 - Trang 1-7 - 2015
Toshihiro Sakaki, Kathleen M. Smits
The mixing of different sized soil particles is known to affect soil properties such as density, porosity, hydraulic conductivity, and soil water retention. To better understand how the mixing controls soil water retention characteristics, a set of laboratory experiments was performed using binary mixtures of coarse and fine particles with seven different mixing fractions. For each mixture...... hiện toàn bộ
Role of Surface Roughness in Chemical Detachment of Colloids Deposited at Primary Energy Minima
Vadose Zone Journal - Tập 11 Số 1 - 2012
Chongyang Shen, Lian‐Ping Wang, Baoguo Li, Yuanfang Huang, Yan Jin
This study theoretically and experimentally examined effects of surface roughness on detachment of colloids deposited under favorable chemical conditions on reduction of solution ionic strength. A superposition approach based on elemental geometric models was developed to estimate variation of Derjaguin–Landau–Verwey–Overbeek (DLVO) interaction energies between a colloid and a rough surfac...... hiện toàn bộ
Effect of a Salt Crust on Evaporation from a Bare Saline Soil
Vadose Zone Journal - Tập 5 Số 4 - Trang 1246-1256 - 2006
Haruyuki Fujimaki, Takahiro Shimano, Mitsuhiro Inoue, Kazurou Nakane
Evaporation from the soil surface is a major cause of the salinization of irrigated soils in arid and semiarid regions. To optimize irrigation scheduling under saline conditions, it is essential to be able to accurately predict solute transport in soils and the evaporation rate. We conducted laboratory column experiments under constant meteorological conditions, except for radiation, which...... hiện toàn bộ
Numerical Analysis of Coupled Water, Vapor, and Heat Transport in the Vadose Zone
Vadose Zone Journal - Tập 5 Số 2 - Trang 784-800 - 2006
Hirotaka Saito, Jiřı́ Šimůnek, Binayak P. Mohanty
Vapor movement is often an important part in the total water flux in the vadose zone of arid or semiarid regions because the soil moisture is relatively low. The two major objectives of this study were to develop a numerical model in the HYDRUS‐1D code that (i) solves the coupled equations governing liquid water, water vapor, and heat transport, together with the surface water and energy b...... hiện toàn bộ
Identifying the Transport Pathways of Dissolved Organic Carbon in Contrasting Catchments
Vadose Zone Journal - Tập 13 Số 7 - Trang 1-14 - 2014
Nele Van Gaelen, Dries Verheyen, Benedicta Ronchi, Eric Struyf, Gérard Govers, Jan Vanderborght, Jan Diels
Dissolved organic C (DOC) plays an important role in the cycling and distribution of energy and nutrients. However, factors controlling the transport of DOC both within and between ecosystems are not clear. The aim of this work was to identify the contributing pathways for transport of DOC to surface water in catchments contrasting in land use and hydrogeology and during different flow reg...... hiện toàn bộ
Predicting the Soil Moisture Characteristic Curve from Particle Size Distribution with a Simple Conceptual Model
Vadose Zone Journal - Tập 10 Số 2 - Trang 594-602 - 2011
Mohammad Hossein Mohammadi, Marnik Vanclooster
Indirect methods for predicting the soil moisture characteristic curve (SMC) from the particle size distribution (PSD) often rely on empirical coefficients, which limits their applicability to independent data sets. We have developed a robust simple PSD‐based conceptual SMC prediction model and evaluated the model performance through comparisons with the Haverkamp and Parlange (HP) and Ary...... hiện toàn bộ
Dynamic Effect in the Capillary Pressure–Saturation Relationship and its Impacts on Unsaturated Flow
Vadose Zone Journal - Tập 1 Số 1 - Trang 38-57 - 2002
S. M. Hassanizadeh, Michael A. Celia, Håkon Dahle
Capillary pressure plays a central role in the description of water flow in unsaturated soils. While capillarity is ubiquitous in unsaturated analyses, the theoretical basis and practical implications of capillarity in soils remain poorly understood. In most traditional treatments of capillary pressure, it is defined as the difference between pressures of phases, in this case air and water...... hiện toàn bộ
Direct Quantification of Dynamic Effects in Capillary Pressure for Drainage–Wetting Cycles
Vadose Zone Journal - Tập 9 Số 2 - Trang 424-437 - 2010
Toshihiro Sakaki, D. M. O’Carroll, Tissa H. Illangasekare
The constitutive relationship between capillary pressure (Pc) and wetting fluid saturation (Sw), or retention curve, is needed to model multiphase flow in porous media. This relationship is usually measured under static conditions; however, transient flow is governed by a dynamic relationship be...... hiện toàn bộ
Woody Vegetation Increases Saturated Hydraulic Conductivity in Dry Tropical Nicaragua
Vadose Zone Journal - Tập 13 Số 1 - Trang 1-11 - 2014
R. J. Niemeyer, Alexander K. Fremier, Robert Heinse, Wladimir Chávez, F. DeClerck
Land conversion in the tropics from primary forest to agricultural land has altered soil hydrologic processes. Woody vegetation is known to increase infiltration rates and saturated hydraulic conductivity (KS) in primary forests compared with agricultural land, but it is less clear if this relationship holds for a gradient of woody vegetation...... hiện toàn bộ
Electrical Resistivity in a Loamy Soil: Identification of the Appropriate Pedo‐Electrical Model
Vadose Zone Journal - Tập 10 Số 3 - Trang 1023-1033 - 2011
Eric Laloy, Mathieu Javaux, Marnik Vanclooster, Christian Roisin, Charles Bielders
Electrical resistance tomography (ERT) can be used for the noninvasive characterization of soil moisture and soil structural heterogeneity. Any attempt to relate electrical resistivity measurements to soil moisture content or soil bulk density, however, must rely on a “pedo‐electrical” function, i.e., a conductivity model for soils. This study aimed to test five pedo‐electrical models for ...... hiện toàn bộ
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