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Showing 1 to 20 of 30 for “"Soil permeability"”.
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Groundwater transport of Escherichia coli bacteria to open surface waters on Virginia's Coastal Plain: a GIS approach
… effluent (STE) may be transported through the soil and contaminate the groundwater. Submarine groundwater discharge (SGWD) may then be providing a conduit into the estuary for the bacteria. Data of OSWDS locations was not available, thus the groundwater transport mechanism was the focus of the …
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Hydrologic Variations Within Created and Natural Wetlands in Southeastern Virginia
… hydrology of wetlands, particularly how wetland soils collect, store, and redistribute water strongly affects how wetland systems function. In created wetlands, construction processes and materials influence the hydrology and consequently, the potential for successful reestablishment of target …
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Estudo da permeabilidade e estrutura de solo-cal
… of changes in perrneability and structure of a soil when stabilized with lime is the objective of this thesis. First, a bibliographic review is made on permeability of clay soils, and the modifications of physical soil properties due to lime treatment. A special permeameter was built which uses …
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Eisenia hortensis Detects Chemesthetic Irritants through TRP Channels
… their movement, they assist in aerating the soil as well as increasing soil permeability to water which can increase plant growth. Despite their importance to agriculture, little is known about earthworm chemesthesis i.e., the detection of chemical irritants. Based on a ecotoxicology soil …
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In Situ Ksat Measurements of Five Fragipan Soils
Soil permeability is a soil property that describes the ability of water to pass through the soil mass. Permeability ratings are used to make land use decisions, especially in the design of on-site septic systems. The present Natural Resources Conservation Service permeability ratings are educated …
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The potential for environmental management to contribute to malaria vector control in western Niger
… approximately 7 days. Increasing the surface soil permeability by ploughing also reduced the persistence time of the pool but was not as effective as leveling. Therefore leveling is the recommended intervention for pools of a small to intermediate size, while ploughing would be recommended for …
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Filtration behaviour of non-woven geotextiles in the gradient ration test
A series of tests was performed on four uniform soils, which have a D85 from 70 Am, with four nonwoven geotextiles, which have a filtration opening size (FOS) from 60 Am to150 Am. No observations of impending clogging were made, however piping occurred in some tests. A ratio of FOS/D85 < 1.5 has …
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Relative importance of Conservation Reserve Programs to mayfly, stonefly, and caddisfly species richness in the Kaskaskia River basin of Illinois
… (number of first order tributaries), WT_Perm (soil permeability at the total catchment level), WT_Urban (urban land use at the total catchment level), Silt, and DO (dissolved oxygen). AICc showed that Link and WT_Perm have the highest importance value (1.00), followed by WT_Urban (0.99), and …
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Sources of nitrate in northwestern Nevada groundwater, 1985-2014 of the requirements for the degree of Master of Science in Hydrogeology
… and high-residential land), septic tank density, soil properties (well vs poorly drained), depth to water, and geology. A Kendall's Tau rank correlation test was used to determine trends in groundwater nitrate concentrations over the 30 years between 1985 and 2014. On the basis of the correlation …
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Classification, identification, and modeling of unexploded ordnance in realistic environments
… an in-depth study of the effects of permeable soil, modeled as a permeable half space, is presented. This study concludes that the discontinuity created by the air to permeable soil interface produces minimal effect in the response of a buried object. The change is limited to a magnitude shift …
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The role of frictional heating in the development of catastrophic landslides
… leading to thermoplastic collapse of the soil skeleton and subsequent increase of pore water pressure. This in turn drastically decreases the resistance to motion and allows the overlying mass to move downslope ever more freely.<br/><br/>The proposed model is implemented numerically and …
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Influence of Soil Moisture Dynamics on DNAPL Spill Zone Architecture and Its Impact on Mass Removal Mechanisms During Soil Vapor Extraction in Heterogeneous Porous Media
… of DNAPL saturation, water saturation, and soil permeability (i.e., spill zone architecture) determines the pore-scale processes that control soil vapor extraction (SVE). To test this hypothesis, a fully coupled multiphase flow and transport simulator, STOMP was chosen. STOMP was first used …
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The Influence of Urban Soil Rehabilitation on Soil Carbon Dynamics, Greenhouse Gas Emission, and Stormwater Mitigation
… has resulted in rapidly increased urban land. Soils are the foundation that supports plant growth and human activities in urban areas. Furthermore, urban soils have potential to provide a carbon sink to mitigate greenhouse gas emission and climate change. However, typical urban land development …
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A geographic information system analysis of submarine groundwater discharge on the eastern shore of Virginia
… including land use, hydraulic gradient and soil permeability were used to create a GIS model of SGWD on Virginia's Eastern Shore. The model was used to predict spatial distribution of SGWD as well as the nutrient loading from nearshore agriculture and on-site waste treatment technologies. …
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Effects of watering interval, planting depth and soil crusting on ermegence and seedling establishment of sorghum (sorghum bicolor (L.) moench)
… in the glasshouse to investigate the effects of soil type, watering interval, planting depth, and crust formation on emergence and seedling establishment of sorghum. Three separate pot experiments were conducted using three soil types and sorghum as a test crop. Various treatment combinations of …
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Effects of watering interval, planting depth and soil crusting on ermegence and seedling establishment of sorghum (sorghum bicolor (L.) moench)
… in the glasshouse to investigate the effects of soil type, watering interval, planting depth, and crust formation on emergence and seedling establishment of sorghum. Three separate pot experiments were conducted using three soil types and sorghum as a test crop. Various treatment combinations of …
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Modelling the Hydrologic Impact of Land Cover on Stormwater Detention Basins in Harris County, TX
… and tropical hurricanes. Low-lying terrain, clay soils with poor drainage, high annual rainfall, and a widespread network of bayous and streams all contribute to frequent flooding. To reduce the impacts of urbanization and the loss of surface storage, the Harris County Flood Control District …
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Engineering characteristics of compacted sand-bentonite mixtures
… of hydraulic and waste containments. Permeability, compressibility and strength are important properties of sand-clay mixtures and are often required for the design of the liner/barrier of the containments. In states like Western Australia, which is covered mostly by sandy soils, …
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The permeability of fine grained soils: an investigation into unconventional methods of measurement in the laboratory
… used British Standard constant head triaxial permeability (BS) test, for permeability testing of fine grained soils, is known to have a relatively long test duration. Consequently, a reduction in the required time for a soil permeability test provides potential cost savings, to the …
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