790 results
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Journal Article
Natural and forced soil aeration during agricultural managed aquifer recharge
Abstract One of the suggested approaches to mitigate the chronic groundwater depletion in California is agricultural managed aquifer recharge (Ag‐MAR), in which farmland is flooded using excess surface water in order to recharge the underlying aquifer. Successful implementation of Ag‐MAR projects…
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Journal Article
Effects of climate change on depression‐focused groundwater recharge in the Canadian Prairies
Abstract Small topographic depressions are ubiquitous in the glaciated terrain of the Northern Prairies characterized by a cold semiarid climate. Groundwater recharge in this region is focused in topographic depressions, which receive lateral inputs of snowmelt runoff in addition to vertical inputs…
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Journal Article
Dynamic groundwater recharge simulations based on cosmic‐ray neutron sensing in a tropical wet experimental basin
Abstract Although cosmic‐ray neutron sensing (CRNS) is probably the most promising noninvasive proximal soil moisture measurement technique at the field scale, its application for hydrological simulations remains underexplored in the literature so far. This study assessed the use of CRNS to…
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Journal Article
Compressional wave velocity and effective stress in unsaturated soil: Potential application for monitoring moisture conditions in vadose zone sediments
Abstract Compressional seismic (P‐wave) velocities were measured experimentally at different matric suctions and confining pressure states using a variety of sediments collected from the USDOE Hanford Site in southeastern Washington State. The P‐wave velocity was measured in variably saturated…
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Soil texture and structure heterogeneity predominantly governs bulk density gradients around roots
Abstract Rhizosphere soil is known to differ from the bulk soil due to numerous physicochemical processes induced by root growth. The spatial extent and magnitude of the influence of roots on the surrounding soil is still debated controversially. To date, most studies focused on a limited number of…
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Journal Article
Testing the EPIC Richards submodel for simulating soil water dynamics under different bottom boundary conditions
Abstract Most biogeochemical models simulate water dynamics using the tipping bucket approach, which has been often found to be too simplistic to represent vadose zone dynamics adequately under shallow groundwater conditions. Recently, a solution to the Richards equation using the Mualem–van…
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Journal Article
Knowledge‐guided machine learning for improving daily soil temperature prediction across the United States
Abstract Data‐driven models used for predicting soil temperature usually have increasing errors with increasing depth. By exploring the integration of knowledge‐based and machine learning approaches, this study used a novel transformation of meteorological variables to increase prediction accuracy…
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Journal Article
Root water uptake of biofuel crops revealed by coupled electrical resistivity and soil water content measurements
Abstract Biofuel crops, including annuals such as maize (Zea mays L.), soybean [Glycine max (L.) Merr.], and canola (Brassica napus L.), as well as high‐biomass perennial grasses such as miscanthus (Miscanthus × giganteus J.M. Greef & Deuter ex Hodkinson & Renvoiz), are candidates for sustainable…
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Journal Article
Geophysics conquering new territories: The rise of “agrogeophysics”
Abstract Agriculture is facing immense challenges. We have to produce enough food while safe‐guarding the environment for future generations. This results in the need to use less water and fertilizer, and to harness soil quality. Key to achieving this goal is improving the understanding of…
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Journal Article
Colloidal catchment response to snowmelt and precipitation events differs in a forested headwater catchment
Abstract Climate change affects the occurrence of high‐discharge (HD) events and associated nutrient exports in catchment stream water. Information on colloidal events‐based losses of important nutrients, such as organic C(Corg), N, P, and S, remain relatively scarce. We hypothesized that…
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Journal Article
Innovative method for installing soil moisture probes in a large‐scale undisturbed gravel lysimeter
Abstract Aquifers of coarse gravel are an important source for drinking water; however, coarse sediments are also particularly susceptible to the rapid and long‐range transport of pollutants through the vadose zone. Therefore, understanding the flow and solute transport in unsaturated gravel…
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Journal Article
Preferential flow under high‐intensity short‐duration irrigation events in soil columns from a karst and nonkarst landscape
Abstract Preferential flow through soil macropores is a major cause of rapid transport of contaminants through soils to drainages systems. Knowledge of the extent of macropore flow in different soil systems is crucial for the effective implementation of nutrient management plans. The objective of…
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Journal Article
Transdisciplinary contributions and opportunities in soil physical hydrology
Abstract As in many other soil science disciplines, in soil physics and hydrology, we have arrived at a point where substantial gains in knowledge depend to a large extent on reaching out to related disciplines. The purpose of this special section on “Transdisciplinary Contributions and…
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Journal Article
Effects of evolving salt precipitation on the evaporation and temperature of sandy soil with a fixed groundwater table
Abstract The effects of salt precipitation on water and heat transport in soil have garnered considerable attention. However, salt precipitation growth on the soil surface and its influence on soil evaporation and temperature under a fixed groundwater table are not well understood. Therefore, the…
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Journal Article
Impact of phosphate adsorption on the mobility of PANI‐supported nano zero‐valent iron
Abstract Nano zero‐valent iron (nZVI) has been used for in situ groundwater remediation due to its strong adsorption and reaction characteristics. However, oxyanion contaminants in groundwater can ready adsorbed onto the surface of nZVI. This can potentially alter the mobility of nZVI and create a…
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Journal Article
Soil evaporation and its impact on salt accumulation in different landscapes under freeze–thaw conditions in an arid seasonal frozen region
Abstract Soil evaporation and its associated processes are vital for agricultural production and ecosystems in seasonal frozen regions. However, soil evaporation and its impact on salt accumulation in different landscapes during freeze–thaw periods have not been well elucidated. In this study…
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Journal Article
Current understanding of subsurface transport of micro‐ and nanoplastics in soil
Abstract Environmental problems caused by plastic pollution in terrestrial systems have received increasing attention, especially the issues related to micro‐ and nanoplastics. Soils are a major receptacle and reservoir of plastics, and accumulated plastics can negatively affect soil health. In…
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Journal Article
Effect of water distribution patterns on the activation energy of unsaturated soils during phase transformation
Abstract Unsaturated soils in vadose zones often experience periodic phase changes during seasonal temperature fluctuations. The liquid in partially saturated soils significantly affects the physical and chemical processes associated with the phase transformations. This study examined the role of…
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Journal Article
Unreconciled effects of salinity on draining and wetting functions in unsaturated soils
Abstract In a sequence of one‐step outflow–inflow experiments, this study examines the effects of salinity on soil hydraulic properties with the goal of developing a better understanding of how to predict salinity's impacts on soils. The results of this study are compared with estimates obtained…