A5021105278- Soil and Unsaturated Flow
- Soil Moisture and Remote Sensing
- Groundwater flow and contamination studies
- Landslides and related hazards
- Lattice Boltzmann Simulation Studies
- Hydrology and Watershed Management Studies
- Soil Geostatistics and Mapping
- Enhanced Oil Recovery Techniques
- Plant Water Relations and Carbon Dynamics
- Geophysical and Geoelectrical Methods
- Scientific Research and Discoveries
- Geophysical Methods and Applications
- Heat and Mass Transfer in Porous Media
- Geology and Paleoclimatology Research
- Planetary Science and Exploration
- Generative Adversarial Networks and Image Synthesis
- Image Processing and 3D Reconstruction
- Aerosol Filtration and Electrostatic Precipitation
- Irrigation Practices and Water Management
- Landfill Environmental Impact Studies
- Seismic Waves and Analysis
- Soil erosion and sediment transport
- Geotechnical Engineering and Soil Mechanics
- Hydraulic Fracturing and Reservoir Analysis
- Climate variability and models
University of Arizona
2013-2024
IQ Samhällsbyggnad
2023
Wake Forest University
2022
Arizona Science Center
2018
John Wiley & Sons (United States)
2016
U.S. Salinity Laboratory
1998-2013
University of New Mexico
2011
Idaho State University
2011
University of California, Riverside
2003-2007
Agricultural Research Service
2000-2005
Abstract The solution of many field‐scale flow and transport problems requires estimates unsaturated soil hydraulic properties. objective this study was to calibrate neural network models for prediction water retention parameters saturated conductivity, K s , from basic Twelve were developed predict using a data set 1209 samples containing sand, silt, clay contents, bulk density, porosity, gravel content, horizon as well data. A subset 620 used develop 19 . Prediction generally improved if...
Abstract Soil, through its various functions, plays a vital role in the Earth's ecosystems and provides multiple ecosystem services to humanity. Pedotransfer functions (PTFs) are simple complex knowledge rules that relate available soil information properties variables needed parameterize processes. In this paper, we review existing PTFs document new generation of developed different disciplines Earth system science. To meet methodological challenges for successful application modeling,...
Pedotransfer functions (PTFs) are becoming a more common way to predict soil hydraulic properties from texture, bulk density, and organic matter content. Thus far, the calibration validation of PTFs has been hampered by lack suitable databases. In this paper we employed three databases (RAWLS, AHUJA, UNSODA) evaluate accuracy uncertainty neural network-based PTFs. Sand, silt, clay percentages density were used as input for PTFs, which subsequently provided retention parameters saturated...
In many vadose zone hydrological studies, it is imperative that the soil's unsaturated hydraulic conductivity known. Frequently, Mualem–van Genuchten model (MVG) used for this purpose because allows prediction of from water retention parameters. For and similar equations, often assumed a measured saturated ( K s ) can be as matching point o while factor S L e to account pore connectivity tortuosity (where relative saturation ). We data set 235 soil samples with test improve predictions MVG...
We propose a method for approximating the adhesion parameters in Shan and Chen multicomponent, multiphase lattice Boltzmann model that leads to desired fluid-solid contact angle. The is straightforward application of Young's equation with substitution cohesion parameter density factor fluid-fluid interfacial tension, corresponding tensions.
We used neural networks (NNs) to model the drying water retention curve (WRC) of 204 sandy soil samples from particle‐size distribution (PSD), organic matter content (SOM), and bulk density (BD). Neural can relate multiple input data output without need an a priori concept. In this way high performance black‐box is created, which very useful in exploration effort assess maximum obtainable prediction accuracy. series NN models with increasing parametrization variables get better...
The unsaturated soil hydraulic properties are often described using Mualem–van Genuchten (MVG) type analytical functions. Recent studies suggest several shortcomings of these functions near saturation, notably the lack second‐order continuity water retention function at saturation and inability conductivity to account for macroporosity. We present a modified MVG formulation that improves description saturation. model introduces small but constant air‐entry pressure ( h s ) into curve....
Modeling flow in variably saturated porous media requires reliable estimates of the hydraulic parameters describing soil water retention and conductivity. These properties can be measured using a wide variety laboratory field methods. Frequently, this proves to an arduous task because high spatial temporal variability properties. In last decade, researchers have shown keen interest developing class indirect approaches, called pedotransfer functions (PTFs), overcome problem. Pedotransfer...
Abstract A correct quantification of mass and energy exchange processes among Earth's land surface, groundwater, atmosphere requires an accurate parameterization soil hydraulic properties. Pedotransfer functions (PTFs) are useful in this regard because they estimate these otherwise difficult to obtain characteristics using texture other ubiquitous data. Most PTFs parameters empirical with modest accuracy. In a continued pursuit improving global‐scale PTF estimates, we evaluated whether...
The structure of the critical zone (CZ) is a result tectonic, lithogenic, and climatic forcings that shape landscape across geologic time scales. CZ can be probed to measure contemporary rates regolith production hillslope evolution, its fluids solids sampled determine how affects function as living filter for hydrologic biogeochemical cycles. Substantial uncertainty remains regarding variability in climate lithology influence both short (e.g., event) long evolution) We are addressing this...
Core Ideas We propose a Hydrophysical Database for Brazilian Soils (HYBRAS). Data in HYBRAS comprise 445 soil profiles, with 1075 samples of soils. compared the accuracy water retention estimates based on climate‐based PTFs. In general, PTFs performed better than temperate models HYBRAS. Model performance differed due to clay content and mineralogical properties. Soil data are fundamental modeling studies. Temperate pedotransfer functions (PTFs) have been commonly used estimate soils, mainly...
Estimation of soil hydraulic properties by pedotransfer functions (PTFs) can be an alternative to troublesome and expensive measurements. New approaches develop PTFs are continuously being introduced, however, PTF applicability in locations other than those data collection has been rarely reported. We used three databases were using artificial neural networks (NNs). Data from Hungary derive national scale PTFs. The HYPRES database was continental Finally, a containing mostly American...
A Shan‐Chen–type multiphase lattice Boltzmann (LB) model was applied to observed computed microtomography data from water‐air and water‐Soltrol displacement experiments in a glass bead porous medium. Analysis of the Bond, Reynolds, Capillary numbers for these systems showed that capillary forces were dominant removing need viscous, gravitational, density effects. numerical parameterization LB yielded surface tension contact angle, appropriate pressure boundary conditions. Two scaling...
[1] Feedbacks among vegetation dynamics, pedogenesis, and topographic development affect the "critical zone"—the living filter for Earth's hydrologic, biogeochemical, rock/sediment cycles. Assessing importance of such feedbacks, which may be particularly pronounced in water-limited systems, remains a fundamental interdisciplinary challenge. The sky islands southern Arizona offer an unusually well-defined natural experiment involving feedbacks because mean annual precipitation varies by...
Abstract. This study focuses on spatial variability of throughfall water and chemistry forest floor content within a Douglas fir (Pseudotsuga menziesii, Franco L.) plot. Spatial patterns (NH4+, NO3‾, SO42-, Cl‾, Mg2+, Ca2+, Na+ K+) were compared tested for stability over time. The coefficient variation (CV) was between 18 26% amounts ions, 17% content. Concentrations all ions correlated significantly. Ion concentrations negatively with amounts, but, except NH4+, there no such relation ion...
Capacitance probe sensors are an attractive electromagnetic technique for estimating soil water content. There is concern, however, about the influence of salinity and temperature on sensors. We present electric circuit model that relates sensor frequency to permittivity medium able correct dielectric losses due ionic conductivity relaxation. The inductance L optimized using readings in a modified setup where ceramic capacitors replace sensor's capacitance plates. three other parameters...