Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 46 for “"ponding"”.
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The changing landscape of energy generation in Virginia: How construction of utility-scale solar sites impacts soil physical and hydraulic properties
… permeability, soil texture, bulk density, and ponding between a stabilized utility-scale solar site and seven reference sites that represent common land uses in the area, such as forest, cropland, grassy areas, and pine plantation. Permeability was measured at the soil surface using single ring …
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Historical and contemporary drivers of greenhouse gas emissions from upland soils
… United States due to climate change, leading to ponding in depressional areas within fields that can feed back on climate change by altering soil greenhouse gas (GHG) emissions. Ponding of soils can temporarily decrease soil O2 concentrations, creating conditions conducive for anaerobic …
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Approximate analytical solutions for modeling subsurface flow
… considered at the soil surface correspond to pre-ponding and post-ponding infiltration.
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Identifying Key Factors for the Implementation and Maintenance of Green Stormwater Infrastructure
… bioretention facilities in which they measured ponding depth, filter media depth, ponding area, and infiltration rates. The NVSWCD concluded that deficiencies found in facilities could mostly be attributed to inadequacies during construction. By comparing current post-construction inspections …
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Chemical treatment of corroding steel reinforcement after removal of chloride contaminated concrete
… treatment of the partially exposed rebar through ponding and/or placement of chemically treated mortar. Reinforced concrete specimens were cast and subjected to repeated exposure to NaCl solution. Half-cell potential, corrosion rate, and chloride ion concentration measurements were conducted until …
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Corrosion performance of coated steel bars in cracked and uncracked reinforced concrete beams
… are curated and subjected to cycling chloride ponding. Additional ECR and TEC macrocell specimens are loaded in service-level displacement and then subjected to cyclic chloride ponding. Standardized corrosion benchmark tests such as half-cell potential (HCP) and macrocell current are employed …
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Spatial arrangement of stormwater infiltration affects partitioning of subsurface storage and baseflow timing
… subsurface storage in scenarios where surface ponding is not severe. Depth to water table beneath infiltration facilities was found to be the main driver of observed differences in partitioning of subsurface storage. In our lowest conductivity soil, silt, severe groundwater mounding was …
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One dimensional pollutant transport model
… the liner thickness, the liner permeability, the ponding head and the initial condition of the porous domain on the spread of the contaminant is studied. Conclusions are presented based on a parametric study.
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The comparative ecology of highrate plastic, conventional mineral and mixed plastic mineral media in the treatment of domestic sewage in percolating filters.
… of organic matter, at the same time avoiding ponding and anaerobic conditions normally associated with excessively loaded single pass mineral filters.A pilot plant was designed and three identical filters construc-ted, one containing 2 m[3] of blast furnace slag and another 2 m[3] of random …
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Examining Melt Pond Dynamics and Light Availability in the Arctic Ocean via High Resolution Satellite Imagery
… small (≤10 m<sup>2</sup>) ponds at the onset of ponding, shifting towards medium sized ponds (mode of 100 to 1,000 m<sup>2</sup>) as surface melt progressed. Late in the summer when ice flows were saturated with ponds, the distribution was skewed towards a handful of very large ponds nearing …
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An evaluation of soil and water management practices on a lowland soil with poor natural drainage
… rainfall, and reducing the depth and duration of ponding compared to undrained land. Drainage resulted in more trafficable and opportunity days for field operations. Drainage dramatically increased earthworm populations which in turn improved the drainage via the pathways for water movement …
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Treatment of Wet Fish Sludge with Vermicomposting
… feed increased from 0 to 50%, there was a corresponding increase in the growth rate of E.fetida biomass. The filter bed test appraised the feasibility and effectiveness of incorporating vermicomposting in sand filter beds to directly treat aquaculture wastewater. Popular in early wastewater …
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Impacts of biota on bioretention cell function during establishment in the Midwest
… macrofauna. The presence of vegetation reduced ponding effects and increased water storage. Earthworm treatments had a lesser ability to store water. All treatments were effective in reducing the concentration of P in effluent. A large amount of N was released during all events from all …
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A study of the effect of the artificial recharge of urban runoff in Roanoke, Virginia
… for the escape of surface waters and the ponding of the urban runoff became a problem. In order to solve this, the city drilled several drainage wells. These wells gave the author I an opportunity to study: the effect of the geology on the ground-water, the ground-water quality, and the …
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The source of uranium and vanadium at the Langer Heinrich and Klein Trekkopje uranium deposits-genesis and controlling factors for uranium mineralization, Western Namibia.
… is more favourable for constriction and ponding of subsurface water unlike that of Klein Trekkopje, which lacks resistant rocks which would restrict the fluids. Oxidizing conditions were fully achieved at Langer Heinrich because there were less saline marine fogs and the subsurface water …
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Evaluation of various products for sediment perimeter barrier
… damming devices or filtering devices based on ponding depth and time to ponding subsidence. Of the new products tested, woven monofilament geotextile, compost log, and ERTEC ProWattle were deemed to be damming devices. Siltworm, coconut coir log, and Curlex Sediment Log were found to be …
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Characterizing and modeling the hydrologic properties of coal combustion by-products in landfills
… CCB pits is most likely to occur in areas where ponding occurs. These results can be coupled with information about the chemical quality of CCB leachates to estimate the impact of landfill disposal of CCBs on the underlying ground water quality.
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Physical and Chemical Controls on Suffosion Development in Gypsic Soil, Culberson County, Texas
… strata. Field studies simulated surficial ponding in various gypsic soils and correlated suffosion potential with soil composition and thickness. Soluble fractions of gypsic soils were delineated through geochemical analyses, further expanding upon the soil descriptions published in the …
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Determination of chloride diffusion constants for concretes of differing water to cement ratios and admixtures
… types of concretes after 8 weeks and 16 weeks of ponding with an NaC1 solution. In addition, one set of these samples was subjected to the outside environment while the other was indoors under controlled conditions. The mixes included water to cement ratios of 0.35, 0.40, 0.45, and 0.50, and two …
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Analysis of an Urban Stormwater Bioretention Management Practice in Prince William County, Virginia
… Typical bioretention areas utilize shallow ponding and highly-infiltrative sandy soils to treat the stormwater runoff from small commercial or residential drainage sites. The Kingsbrooke bioretention area was found to be atypical in several ways, including its relatively large, 14 acre, …
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