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Showing 1 to 20 of 210 for “"low flow"”.
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Low flow mixing in open channels
… quality and pollution in natural streams under low flow conditions, during which pollution problems are most acute, a complete understanding of the effects of variations of flow and channel geometry on mixing and transport of polluted releases is necessary to establish sound water pollution …
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Modeling Low Flow Hydraulics in Alluvial Channels (pools-Riffles, Open)
The investigation of the flow condition has become important in recent years as a means of determining critical levels of water pollution, aquatic habitat and instream flow needs. To assess these critical conditions, it is necessary to predict the hydraulic response of a river system to a given low …
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Water Spreading Under Low Flow Conditions for Vegetated Treatment Area Applications
… for effectiveness of spreading water under low flow conditions.<br /> A laboratory model was constructed to test various configurations of level spreading devices. The effectiveness of each spreader was measured across a range of low flow rates. The collected data was statistically analyzed …
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Ecohydrologic Indicators of Low-flow Habitat Availability in Eleven Virginia Rivers
… scenarios on instream habitat is Instream Flow Incremental Methodology (IFIM). The primary outputs of IFIM studies are: 1) habitat rating curves that relate habitat availability to streamflow for every species, lifestage, or recreational use modelled; and 2) habitat time series under …
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Design and Modelization of a Vertical-Axis Hydrokinetic Turbine for Low Flow Velocities
Esta tesis aborda el diseño y caracterización de una pequeña turbina hidrocinética de eje vertical para bajas velocidades de flujo. El perfil del álabe, la solidez y la relación de aspecto del modelo de turbina se han seleccionado buscando un funcionamiento autoarrancable y eficiente. El modelo de …
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Low flow pressure drop flow rate instabilities in a compressible air-water system
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1979.
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Comparing Alternative Methods of Simulating Bacteria Concentrations with HSPF Under Low-Flow Conditions
During periods of reduced precipitation, flow in low-order, upland streams may be reduced and may stop completely. Under these "low flow" conditions, fecal bacteria directly deposited in the stream dominate in-stream bacteria loads. When developing a Total Maximum Daily Load (TMDL) to address a …
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DEVELOPMENT AND TESTING OF A NEW AIR-ASSISTED FLARE SYSTEM FOR LOW FLOW CONDITIONS
… costly to supply or ambient temperatures are too low. The environmental protection agency (EPA) considers flares to be a source of emissions with many harmful gases such as unburned waste gases, carbon monoxide, and soot, among others, if their combustion efficiency falls below 96.5%. Low …
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Theoretical investigation of volute effect on low-flow dynamic stability in a centrifugal pump
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Using Water Budgets and Isotope Analysis to Explore Water Availability in Low Flow Conditions: Hartley Pond Case Study
… changes to the volume and timing of water flowing through a reservoir provides valuable information for responsible resource management. Hartley Pond is a reservoir in Duluth, Minnesota, that is formed by a dam on Tischer Creek. Solar forcing to the reservoir elevates the summer water …
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Low Flow Variations in Source Water Supply for the Occoquan Reservoir System Based on a 100-Year Climate Forecast
The reliability of future water supplies comes into question with the onset of global climate change and the variations in local weather patterns that it brings. Changes in temperature, precipitation, soil moisture, and sea level can all have an impact on drinking water storage and supply. As these …
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An assessment of the offstream storage requirements and low-flow frequencies characteristics to supply coal slurry piplines originating in southwestern Virginia
… alternatives for the maximum diversion rates allowed from the stream at any time, to account for the capacity of the diversion or intake structure, as well as that of the conveyance line between the intake and the reservoir, as the latter would not probably be located directly next to the intake …
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Effect of Installation Practices on Galvanic Corrosion in Service Lines, Low Flow Rate Sampling for Detecting Water-Lead Hazards, and Trace Metals on Drinking Water Pipeline Corrosion: Lessons in Unintended Consequences
… lead risks demonstrated that the choice of flow rate has a substantial impact on lead-in-water hazards. On average, lead concentrations detected in water at high flow without stagnation were at least 3X-4X higher than in traditional regulatory samples with stagnation, demonstrating a new …
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Metabolism in myocardial ischaemia and reperfusion with specific reference to the role of glucose
… Glucose is known to be protective in moderate low flow ischaemia due to the production of glycolytic ATP. However, it is questioned whether glucose would still be protective in ultra-low flow ischaemia. Firstly, glycolysis is thought to be inhibited, and secondly, deleterious glycolytic …
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The Waimakariri River and its environment: frequency analysis of extreme events and the effects of flow modifications
… based on theoretical considerations. Low flow frequency analysis, albeit an informative tool for water planning, is seldom utilised and no estimates are published for the Waimakariri River. However, low flow frequency estimates can provide valuable information for the management of …
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Analysis and management of low flows in small catchments of Brandenburg, Germany
… protection is vulnerable to extreme low flows during streamflow droughts. During the last decades, in most rivers of Central Europe summer runoff and low flows have decreased. Discharge projections agree that future decrease in runoff is likely for catchments in Brandenburg, Germany. …
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Frequency analysis of low flows: comparison of a physically based approach and hypothetical distribution methods
Several different approaches are applied in low flow frequency analysis. Each method's theory and application is explained. The methods are (1) physically based recession model dealing with time series, (2) log-Pearson type III and mixed log-Pearson type III using annual minimum series, (3) Double …
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Design and Evaluation of a Marine Scrubber System
… 1992 Mack E7 engine over two test cycles, a High Flow cycle and Low Flow cycle. The High Flow cycle was used to represent marine harbor craft operation. Over this cycle the system was able to reduce engine NOX emissions by an average of 41.2%. The Low Flow cycle was developed to investigate the …
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Design of a 50-watt air supplied turbogenerator
… presents the design of a high-pressure-ratio, low-flow turbogenerator with 50 W electrical power output, designed to operate from a 5-bar air supply. The research shows that a MEMS-based silicon turbine in combination with a micro-machined generator can meet the design objectives of the …
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Investigating nitrate attenuation in an urban stream using stable isotope geochemistry and continuous monitoring
… in an urban stream during high and low flow periods. A wastewater treatment plant (WTP) on Pennypack Creek, an urban stream near Philadelphia, PA, increases nitrate concentrations to a mean of 8.5 mg-l-1 (as N). Concentrations decrease to 5.5 mg-l-1 about 7.5 km downstream. Reaches …
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