790 results
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Journal Article
Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface
Abstract Methane transport in soil is primarily affected by soil physical conditions such as soil texture and soil structure, soil moisture, soil‐gas diffusivity, permeability, and soil temperature. Aggregated soils have distinct soil structure with two pore regions characteristics (i.e…
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Journal Article
Impact of biochar and lignite‐based amendments on microbial communities and greenhouse gas emissions from agricultural soil
Abstract Understanding the responses of the microbial community and greenhouse gas (GHG) emissions to the incorporation of different organic amendments is essential for their proper utilization. In this study, laboratory‐incubated microcosm experiments were conducted to investigate the short‐term…
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Journal Article
The site‐specific selection of the infiltration model based on the global dataset and random forest algorithm
Abstract The selection of the infiltration equation is important in various water research and management fields. Different infiltration equations were found to perform better than others in previous studies. Our objective was to use the Soil Water Infiltration Global (SWIG) database for (a)…
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Journal Article
A black‐box automated approach to calibrate numerical simulations and optimize cover design: Application to a flow control layer constructed on an experimental waste rock pile
Abstract Mining operations often produce large volumes of waste rock to access economically valuable mineralized zones. Waste rock is usually stored in surface piles, the construction and reclamation of which represent a challenge for the industry. A flow control layer (FCL) made of crushed waste…
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Journal Article
Modeling NO3–N leaching during establishment of turfgrasses irrigated with tailored reclaimed water
Abstract Turfgrass systems have been identified as potential sources of nitrate leaching and subsequent groundwater contamination. The HYDRUS (2D/3D) model was used to quantify nitrate leaching from bermudagrass [Cynodon dactylon (L.) Pers.] and buffalograss [Buchloe dactyloides (Nutt.) Engelm]…
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Journal Article
A soil moisture‐based framework for guiding the number and location of soil moisture sensors in agricultural fields
Abstract Soil moisture information is a key variable for guiding in‐season management decisions in rainfed and irrigated agricultural systems. However, methods for deciding the number and location of soil moisture sensors (SMS) per field still remain poorly explored in the scientific literature…
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Journal Article
Evapotranspiration estimation in rain gardens using soil moisture sensors
Abstract Rain gardens are increasing in use as the shift from gray to green infrastructure continues. Water that enters a rain garden is removed by three mechanisms: overflow to an outlet, percolation to the underlying soil, and evapotranspiration (ET) to the atmosphere. Despite the importance of…
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Journal Article
Preferential flow of surface‐applied solutes: Effect of lysimeter design and initial soil water content
Abstract Undisturbed lysimeters are widely used to study water and solute transport, where both natural and unnatural preferential flow can greatly influence leaching rates. The objective of this study was to use chemical and isotopic tracers to quantify the effect of initial soil water content and…
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Journal Article
Evaporation from undulating soil surfaces under turbulent airflow through numerical and experimental approaches
Abstract Evaporation from undulating soil surfaces is rarely studied due to limited modeling theory and inadequate experimental data linking dynamic soil and atmospheric interactions. The goal of this paper is to provide exploratory insights into evaporation behavior from undulating soil surfaces…
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Journal Article
Effects of microplastics and earthworm burrows on soil macropore water flow within a laboratory soil column setup
Abstract Several earlier studies reported that microplastics (MP) accumulated on soil surfaces could be transported into the subsoil and ingested by soil biota, such as earthworms. The present study explores how networks of earthworm burrows and MP (low‐density polyethylene, LDPE) in subsoil affect…
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Journal Article
Modeling near‐surface water redistribution in a desert soil
Abstract Despite the vast extent of desert soils on the earth's surface, our understanding of the moisture dynamics of near‐surface desert soils (i.e., the top centimeters to few meters of the soil profile) remain limited. The goal of this study was to explore the use of the Peters–Durner–Iden (or…
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Journal Article
Accounting for heterogeneity in the θ–σ relationship: Application to wheat phenotyping using EMI
Abstract Geophysical methods, such as electromagnetic induction (EMI), can be effective for monitoring changes in soil moisture at the field scale, particularly in agricultural applications. The electrical conductivity (σ) inferred from EMI needs to be converted to soil moisture content (θ) using…
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Journal Article
Characterization of coatings on metallic nanoparticles by surface‐enhanced Raman scattering (SERS) for environmental purposes
Abstract The increasing production and use of engineered inorganic nanoparticles (EINPs) escalate the risk for their unintended release into the environment. Coating of nanoparticles like natural organic matter (NOM) plays an important role in the stability, toxicity, and transport of…
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Journal Article
Comparison of the performance of 22 models describing soil water retention curves from saturation to oven dryness
Abstract Soil water retention curve (SWRC) is key hydraulic property for vadose zone hydrology. Selected 22 SWRC models with different structures were divided into four types: traditional, single‐segment, two‐segment, and three‐segment models. According to the accuracy and model selection…
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Journal Article
Macropore–matrix mass transfer of reactive solutes quantified by fluorescence imaging
Abstract Horizontal infiltration experiments with a fluorescent dye (e.g., Na‐fluorescein) potentially allow the quantification of the macropore–matrix mass transfer of reactive solutes through coated macropore surfaces. The objectives were (a) to determine the movement and map the spatial mass…
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Journal Article
Soil apparent electrical conductivity‐directed sampling design for advancing soil characterization in agricultural fields
Abstract The “4 per 1,000” initiative calls for land management practices that increase soil organic C (SOC). Despite an imperative for accurate SOC measurement, several methodological issues may complicate the verification of C sequestration. The aim of this work is to evaluate the potential…
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Journal Article
Parameterization of a hydrologic model with geophysical data to simulate observed subsurface return flow paths
Abstract A portion of water not consumed by crops during flood irrigation can flow back across the surface or through the subsurface to adjacent surface water bodies and streams as return flow. Few studies have directly addressed subsurface processes governing return flow and the importance of…
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Journal Article
Forward prediction of early‐time spontaneous imbibition of water in unsaturated rock fractures
Abstract Spontaneous imbibition is a capillary‐driven phenomenon in which a wetting fluid displaces a nonwetting fluid from voids without any increase in external pressure. This study compared forward predictions of early‐time displacement of air by water within Mode I fractures in 14 low‐porosity…
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Journal Article
Quantification of hydraulic redistribution in maize roots using neutron radiography
Abstract Plants redistribute water from wet to dry soil layers through their roots, in the process called hydraulic redistribution. Although the relevance and occurrence of this process are well accepted, resolving the spatial distribution of hydraulic redistribution remains challenging. Here, we…