790 hasil
Menampilkan 301–320 · 0,22 detik · RSS
-
Artikel Jurnal
Heterogeneous multiphase flow properties of volcanic rocks and implications for noble gas transport from underground nuclear explosions
Abstract Of interest to the Underground Nuclear Explosion Signatures Experiment are patterns and timing of explosion‐generated noble gases that reach the land surface. The impact of potentially simultaneous flow of water and gas on noble gas transport in heterogeneous fractured rock is a current…
-
Artikel Jurnal
Cover crops and tillage effects on carbon–nitrogen pools: A lysimeter study
Abstract Cover crops (CCs) and tillage practices influence C and N pools in soil, which can affect dissolved organic C (DOC) and N leaching from agricultural fields. Previous studies on cover crops have focused mostly on nitrate leaching and total C (TC). Therefore, a study was conducted in…
-
Artikel Jurnal
Root architecture development in stony soils
Abstract Soils with high stone content represent a challenge to root development, as each stone is an obstacle to root growth. A high stone content also affects soil properties such as temperature or water content, which in turn affects root growth. We investigated the effects of all soil…
-
Artikel Jurnal
Cover systems with synthetic water‐repellent soils
Abstract A cover system is a crucial component of engineered landfills, to minimize water percolation into the underlying waste. Capillary barriers are an alternative cover system, which has been widely used in the arid and semiarid regions as no cohesive, low‐permeability materials are used…
-
Artikel Jurnal
Hydrodynamic characterization of soil compaction using integrated electrical resistivity and X‐ray computed tomography
Abstract Modern agricultural practices can cause significant stress on soil, which ultimately has degrading effects, such as compaction. There is an urgent need for fast, noninvasive methods to characterize and monitor compaction and its impact on hydraulic processes. Electrical resistivity…
-
Artikel Jurnal
A methodology for simulating perched conditions in multilayer aquifer systems with 2D variably saturated flow
Abstract Simulatingflow through multilayer aquifer systems is essential for groundwater management applications such evaluating natural recharge, assessing managed aquifer recharge (MAR), the characterization of surface water–groundwater interactions, and groundwater pollution risk analysis…
-
Artikel Jurnal
Wavelet analysis of soil water state variables for identification of lateral subsurface flow: Lysimeter vs. field data
Abstract Preferential and lateral subsurface flow (LSF) may be responsible for the accelerated transport of water and solutes in sloping agricultural landscapes; however, the process is difficult to observe. One idea is to compare time series of soil moisture observations in the field with those in…
-
Artikel Jurnal
Developing a strategy for the national coordinated soil moisture monitoring network
Abstract Soil moisture is a critical land surface variable, affecting a wide variety of climatological, agricultural, and hydrological processes. Determining the current soil moisture status is possible via a variety of methods, including in situ monitoring, remote sensing, and numerical modeling…
-
Artikel Jurnal
Investigating the controls on greenhouse gas emission in the riparian zone of a small headwater catchment using an automated monitoring system
Abstract Riparian zones as the transition zone between terrestrial and aquatic ecosystems play an important role in C and N cycling and greenhouse gas (GHG) emissions. As such, they may help to mitigate climate change but could also accelerate it, depending on the particular processes affected by…
-
Artikel Jurnal
Removing the effects of temperature on electrical resistivity tomography data collected in partially frozen ground: Limitations and considerations for field applications
Abstract Time‐lapse electrical resistivity tomography (ERT) can be used to image a wide variety of subsurface processes. It is often necessary to remove the effects of seasonal near‐surface temperature variability in order to interpret the signal of interest. Here, we use a synthetic modeling…
-
Artikel Jurnal
Quantifying hydrologic pathway and source connectivity dynamics in tile drainage: Implications for phosphorus concentrations
Abstract Flowpathways and source water connectivity dynamics are widely recognized to affect tile‐drainage water quality. In this study, we developed and evaluated a framework that couples event‐based hydrograph recession and specific conductance end‐member mixing analysis (SC‐EMMA) to provide a…
-
Artikel Jurnal
Influence of agricultural managed aquifer recharge on nitrate transport: The role of soil texture and flooding frequency
Abstract Agricultural managed aquifer recharge (Ag‐MAR) is a concept in which farmland is flooded during the winter using excess surface water to recharge the underlying groundwater. In this study, we show how different recharge practices affect NO3− leaching and mineralization–denitrification…
-
Artikel Jurnal
MesoSoil v2.0: An updated soil physical property database for the Oklahoma Mesonet
Abstract Soil moisture data from the Oklahoma Mesonet have been used in numerous fields within the Earth sciences, including agriculture, hydrology, and meteorology. Soil matric potentials measured by heat dissipation sensors at Oklahoma Mesonet stations have been converted to soil volumetric water…
-
Artikel Jurnal
Towards new soil water flow equations using physics‐constrained machine learning
Abstract The Richardson–Richards equation (RRE) is a widely used partial differential equation (PDE) for modeling moisture dynamics in unsaturated soil. However, field soil moisture observations do not always satisfy RRE. In this paper, we introduce a new physically constrained machine learning…
-
Artikel Jurnal
Recharge site assessment through the integration of surface geophysics and cone penetrometer testing
Abstract The ability to identify, at potential managed aquifer recharge sites, the presence of connected pathways of hydraulically conductive sediments from the ground surface to the water table could help minimize costs and risks associated with recharge operations. A spatially dense dataset had…
-
Artikel Jurnal
Feasibility study on prepolarized surface nuclear magnetic resonance for soil moisture measurements
Abstract In the past few years, small‐scale (2 m) prepolarized surface nuclear magnetic resonance (SNMR) has gained increasing interest in the research community. As recent studies demonstrated, the application of a strong prepolarization field enhances the SNMR signal of coils with a footprint
-
Artikel Jurnal
Seismic signatures reveal persistence of soil compaction
Abstract A well‐developed soil structure is a key attribute of a productive and functioning soil. Evidence shows that subtle changes in the spatial arrangement and binding of soil constituents impart large changes in soil mechanical and hydraulic properties and associated ecological services…