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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 20 for “"road salt"”.
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Road Salt Runoff - Impact on Macroinvertebrates and Water Quality
… trophic level predators in freshwater food webs. Salt contamination due to road de-icing can often produce a dense saline layer just above the sediment–water interface potentially exposing benthic macroinvertebrates to high salt concentrations. Reported impacts on salinity increase on …
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Effects of road salt on photosynthetic and enzyme activity of stream biofilms
<p>Road salt application and salt-laden run-off are common, yet little information exists about its influence on periphyton. I measured extracelluar enzyme activity and photosynthetic activity of natural winter stream periphyton communities under various short-term laboratory salt exposures. The …
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Characterizing the Impact of Freshwater Salinization on Engineered Ecosystems: Implications for Performance, Resilience, and Self-Repair Through Phytoremediation
… winter, these basins receive saline runoff from road salt application, which contributes to Freshwater Salinization Syndrome (FSS). Since limited research has connected direct measurement of soil and stormwater salinities to biodiversity and phytoremediation potential of salt-tolerant plant …
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The Measurement of Atmospheric Species with Absorptions Close to the Actinic Flux Cut-Off by Active & MAX-DOAS: Chlorine Monoxide (CIO) & Sulphur Dioxide (SO2)
… as well, originating primarily from sea salt aerosols in the marine boundary layer, but direct spectroscopic observations have been limited. In this research, we endeavour to identify and quantify ClO in a mid-latitude urban atmosphere removed from a large source of salt water, using …
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Salt retention in wetland soils and effects on dissolved organic carbon export
<p>Deicing salt runoff has negative effects on ecosystems. Wetland ecosystems can act as important filters for runoff pollution (e.g., nutrients), mitigating damage to plants and microbes. Wetlands are important sinks for nutrients and pollutants (e.g., road salt) and transformation spots for many …
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STORMWATER MANAGEMENT PRACTICE MONITORING USING LONG-TERM TIME LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY AND SOIL SENSORS: IMPLICATIONS FOR DESIGN, MAINTENANCE, AND SOIL MOISTURE MONITORING
… parameters when tracking infiltration and road salt influx at these SMPs. Additionally, the ERT data can be converted to soil moisture values using Archie’s law, which is important for determining soil moisture at points where no sensors are currently placed. We built and installed three …
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Nitrogen biogeochemistry in Binghamton, NY, a medium-sized urban ecosystem
… watersheds in the region. In an experiment in a roadside ecosystem, experimental deposition of N and road salt (NaCl) did not affect N cycling in roadside soils. However, NaCl negatively impacted C mineralization and soil respiration in situ. In a final experiment, we found that the microbial …
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Electrical resistivity and ground-penetrating radar as tools to characterize groundwater surface water interaction at Mirror Lake, NH
… water interaction, as well as for imaging road salt contamination. In-situ measurements of seepage coincident with resistivity surveys suggested a relationship between resistivity values and seepage rates. Specifically, we observed that seepage rates were low (averaging-20 cm/day) at Mirror …
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Acidification and Climate Warming: Understanding the Impact of Multiple Anthropogenic Stressors on Adirondack (NY, USA) Lakes
… protected from acidification, eutrophication, road salt seepage, and piscivore introductions were identified from 1,469 Adirondack lakes. Ordination techniques showed that the lakes are representative of 24-36% of the chemical/morphological variation of Adirondack lakes. Qualitative and …
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Assessment of Long-Term Changes in Water Quality from Halifax Region Lakes (Nova Scotia, Canada) Using Paleolimnological Techniques
… increased in 45% of the study lakes suggesting road salt as an additional stressor. This thesis provides a rapid paleolimnological-based technique to assess regional water-quality changes, and further demonstrates the complexity of ecological changes within freshwater resources.
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Changes in Diatom Assemblages in Adirondack (NY, USA) Reference Lakes Since Pre-Industrial Times
… or local (e.g. fish stocking, liming, seepage of road salt, cultural eutrophication) environmental disturbances. Inferring changes related to climate are difficult due to the possible complexities associated with multiple stressors. Thirty minimally-disturbed ‘reference’ lakes were identified from …
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Nutrient Loadings Into Conesus Lake
… of the Inlet wetland on nutrient dynamics and road salt loadings. N0 3 -N loading upstream of the Conesus Inlet Wetland that was consistently about 2.5 times higher than downstream suggests nitrogen removal by denitrification in the wetland. Hanna's and Wilkins Creeks were found to be sources …
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ASSESSING THE ROLE OF GEOLOGIC SETTING ON THE HYDROLOGY AND GROUND WATER GEOCHEMISTRY OF FENS IN THE GLACIATED MIDWESTERN UNITED STATES
… to Na+ and Cl-, which has been linked to road salt contamination at two of the study sites. This hydrogeochemical study also reveals that fens (slope wetlands) within this particular geologic setting of central Indiana show strong geochemical similarities to fens located throughout the …
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Role of Chloride in Galvanized Iron Plumbing Corrosion and the Use of Fingerprinting Methods to Identify Water Lead Sources
… of 12 in WSSC modified water to simulate actual road salt runoff events. Increased orthophosphate or alkalinity could at least partly counter the adverse effects of chloride, as the average iron concentration decreased by 43% as orthophosphate level increased from 3.8 to 11.2 mg/L as P, and …
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Corrosion performance of coated steel bars in cracked and uncracked reinforced concrete beams
… carbon steel that would lead to corrosion in road-salt chloride ion environments. Despite several studies investigating the mechanical performance of TEC as compared to ECR, no study has explored the long-term corrosion resistance performance of this new type of coating. This research aims to …
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Evaluation of the Impacts of De-Icing Salts on the Performance of Bioretention Media in Retaining Phosphorus From Urban Stormwater
… climate regions due to factors such as inputs of road de-icing salts. This study evaluates the impact of prolonged and periodic salt inputs on P retention by conducting column experiments using three different bioretention media with and without an amendment added. Non-amended columns showed net P …
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Evaluating the effects of hydrogeologic processes on the fate of salinity and halogens in headwater catchments
… to freshwater systems. This approach can broadly distinguish endmember sources of salinity (e.g. road salts from basin brines) from one another, although has proven ineffective in distinguishing saline endmembers originating from the same processes (e.g. formation waters of different ages), …
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Quantifying factors that influence road deicer retention and export in a multi-landuse Upstate New York watershed
… particularly in northern latitudes where deicing salts are applied to roadways. This study determined how deicer impacted runoff disperses through sub-urban and urban areas on seasonal and multi-year scales. Chloride concentration changes were then modelled under varying pollutant loading …
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Modelo y simulación hidrogeológica para la sostenibilidad del acuífero libre de los Montes Torozos
… of de-icing and anti-icing substances (typically road salt) and/or leaking fuel tanks along the N-601 constitutes the main hazards to forthcoming monitoring and control. There are physical and chemical water parameters exceeding the legal allowed limits. For this reason most of this water is unfit …