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Artikel Jurnal
Identifying the Main Factors Contributing to the Spatial Variability of Soil Saline–Sodic Properties in a Reclaimed Coastal Area
Studies on changes in soil saline–sodic characteristics have important reference value for reclamation planning and agricultural utilization of coastal regions. The objective of this study was to investigate the spatial distribution of the soil salt content (SSC) and sodium adsorption ratio (SAR)…
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Artikel Jurnal
Tradeoffs in Model Performance and Effort for Long-Term Phosphorus Leaching Based on In Situ Field Data
Phosphorus and N are critical nutrients for agriculture but are also responsible for surface water enrichment that leads to toxic algal growth. Although P loading to surface waters has traditionally been thought to occur primarily in surface runoff, contributions from subsurface transport can also…
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Artikel Jurnal
Streaming Potential Coupling Coefficient and Transport Properties of Unsaturated Carbonate Rocks
We measured the streaming potential coupling coefficient of natural saturated and unsaturated carbonate rocks. Saturation was achieved with NaCl brines with salinities ranging from 2 × 10 to 2.0 mol L. The magnitude of the coupling coefficient increased with decreasing salinity, similarly to the…
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Artikel Jurnal
Effects of Mucilage on Rhizosphere Hydraulic Functions Depend on Soil Particle Size
Mucilage secreted by roots alters hydraulic properties of soil close to the roots. Although existing models are able to mimic the effect of mucilage on soil hydraulic properties for specific soils, it has not yet been explored how the effects of mucilage on macroscopic soil hydraulic properties…
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Artikel Jurnal
Predicting the Campbell Soil Water Retention Function: Comparing Visible–Near-Infrared Spectroscopy with Classical Pedotransfer Function
The soil water retention curve (SWRC) is essential for the modeling of water flow and chemical transport in the vadose zone. The Campbell function and its (pore-size distribution index) parameter fitted to measured data is a simple method to quantify retention under relatively moist conditions…
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Artikel Jurnal
Surface Complexation Modeling of Fluoride Adsorption by Soil and the Role of Dissolved Aluminum on Adsorption
The adsorption processes of F on a natural soil as a function of varying pH and F concentration were evaluated by applying a surface complexation model (SCM) based on a single surface functional group with monodentate binding sites. A granitic soil from Tsukuba, Japan, was chosen as an example, and…
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Artikel Jurnal
Infiltration Patterns and Ecological Function of Outcrop Runoff in Epikarst Areas of Southern China
Rock outcrops (ROCs), a widespread surface component in a karst landscape, play a unique, hydrological role in the infiltration and redistribution of precipitation. This experiment aimed to explore water pathways of outcrop runoff and their ecological functions in epikarst by applying the dye…
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Artikel Jurnal
A New Simulation Framework for Soil–Root Interaction, Evaporation, Root Growth, and Solute Transport
We have developed a general model concept and a flexible software framework for the description of plant-scale soil–root interaction processes including the essential fluid mechanical processes in the vadose zone. The model was developed in the framework of non-isothermal, multiphase…
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Artikel Jurnal
A Century of Denial: Preferential and Nonequilibrium Water Flow in Soils, 1864-1984
This review provides a historical summary of the development of knowledge on preferential and non-equilibrium flows in soils, particularly in the period 1864 to 1984. It is pointed out that preferential flows were recognized long before the equilibrium concepts of Edgar Buckingham and Lorenzo A…
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Artikel Jurnal
AMMA-CATCH, a Critical Zone Observatory in West Africa Monitoring a Region in Transition
West Africa is a region in fast transition from climate, demography, and land use perspectives. In this context, the African Monsoon Multidisciplinary Analysis (AMMA)–Couplage de l’Atmosphère Tropicale et du Cycle eco-Hydrologique (CATCH) long-term regional observatory was developed to monitor the…
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Artikel Jurnal
Impact of Temporal Macropore Dynamics on Infiltration: Field Experiments and Model Simulations
Macropores greatly affect water and solute transport in soils. Most macropores are of biogenic origin; however, the resulting seasonal dynamics are often neglected. Our study aimed to examine temporal changes in biopore networks and the resulting infiltration patterns. We performed infiltration…
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Artikel Jurnal
Measuring and Modeling Stable Isotopes of Mobile and Bulk Soil Water
Recent findings from stable isotope studies have opened up new questions about differences in the isotopic composition (δH and δO) of mobile (MW) and bulk water (BW) in soils. We sampled the isotopic compositions of MW using suction lysimeters and BW with the direct-equilibration method. The study…
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Artikel Jurnal
Undrained Shear Strength of Unsaturated Soils under Zero or Low Confining Pressures in the Vadose Zone
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…
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Artikel Jurnal
Roots Partially in Contact with Soil: Analytical Solutions and Approximation in Models of Nutrient and Water Uptake
Root–soil contact entails a trade-off between uptake opportunities and aeration requirements. A single root in the center of a cylinder of soil has been the standard geometry for which most root-level water and nutrient uptake models have been derived. However, this implies assumptions about…
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Artikel Jurnal
Development of a Physically Based Soil Albedo Parameterization for the Tibetan Plateau
Soil albedo controls the surface energy budget on the Tibetan Plateau (TP); however, estimates of the soil albedo include substantial uncertainties. This study presents a physically based soil albedo parameterization that includes the effects of the solar zenith angle and liquid soil moisture. The…
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Artikel Jurnal
Finger Flow Development in Layered Water-Repellent Soils
Finger flow in water-repellent (WR) soils significantly influences the transport of water and solutes in the soil, but the mechanics of finger flow occurrence in layered WR soils is not clear. Soil chamber infiltration experiments with a total of 20 treatments, including five different WR levels…
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Artikel Jurnal
TopCap: A Tool to Quantify Soil Surface Topology and Subsurface Structure
The surface of a material such as soil, as characterized by its topology and roughness, typically has a profound effect on its functional behavior. While nondestructive imaging techniques such as X-ray computed tomography (CT) have been used extensively in recent years to characterize the internal…
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Artikel Jurnal
Magnetic Resonance Monitoring and Numerical Modeling of Soil Moisture during Evaporation
Evaporation from bare soil surfaces can be restrained to a great extent with the development of a dry layer at the soil surface where capillary hydraulic conductance ceases and water flow proceeds only by gas phase transport. Model calculations and preliminary experiments with model porous media…
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Artikel Jurnal
The Strengbach Catchment: A Multidisciplinary Environmental Sentry for 30 Years
Research activity associated with various observations at the Strengbach catchment in the Vosges Massif (880–1150 m) addresses many questions in the domains of hydrology and geochemistry. The catchment is the observation and experimental site of the Observatoire Hydro-Géochimique de l’Environnement…
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Artikel Jurnal
Monitoring of Water and Solute Transport in the Vadose Zone: A Review
A number of contaminants including agrochemicals (fertilizers, pesticides), heavy metals, trace elements, and pathogenic microbes along with pharmaceuticals and hormones used in animal production move through the soil and are responsible for degradation of groundwater quality. Therefore, it is…