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 21 for “"flow variability"”.
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Constant Flow Management - Investigating manufacturing flow variability
This project investigates the manufacturing flow variability in order to stabilize the factory process flow. Nowadays, in manufacturing production lines and particularly in modern front end semiconductor lines, processes and equipments are very complex. Any disturbance of the process creates …
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Patterns of flow variability: consideration for river regulation and salmon management
The natural flow paradigm is based on the assumption that aquatic organisms have adapted to a range of flows. However, flow variability is currently not represented in water resource management in England and Wales. This thesis addresses the need to incorporate seasonal and inter annual flow …
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Long Term Hydrologic Effects on Stream Health from Residential Development Patterns
… HSPF is used to generate overland and channel flows from 43 years of rainfall. Hydrologic output from HSPF of the various landuse patterns from the eight scenarios are evaluated using Post Processor, a Visual Basic program. The results show that increased development causes a reduction in Back …
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Ecologically Based Methods for Multi-Objective Water Resources Management in Taiwan
… to hydrological statistics to analyze flow requirements. This analysis is then used to develop indicators of an ecological flow regime that considers natural flow variability with species habitat and ecological needs to provide guidance in the management of the volume, frequency and …
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Patterns and drivers of seasonal land-ice-flow around Antarctica
… Antarctica. Assessing the degree of seasonal ice-flow variability, and establishing a process-based understanding of the key environmental drivers responsible, are of critical importance for quantifying accurately the total volume of ice discharged from the Antarctic Ice Sheet, and thus its …
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A Vadose Zone Field Study: Subsurface Tile Drainage, Hydrology, and Variablity
… during energy limiting periods. A winter flow period was marked with a large loss of water to tile flow possibly the result of off site regional groundwater contributions. The piezometer analysis showed the difference in water table behavior between undrained and drained conditions. …
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Reducing variability in a semiconductor manufacturing environment
… time today is queuing time caused partly by variability in the manufacturing environment. Being able to reduce this variability component could result in improvements in throughput time. In this work, Factory Physics methods are used to analyze variability in the manufacturing flow. First, …
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Zooplankton in Flowing Waters
… features. The current study assessed the role of flow in characterizing the microcrustacean zooplankton community of the Missouri River. I also designed an artificial flow chamber for observing species-specific responses to flow. Missouri River zooplankton samples and physico-chemical variables …
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How do sand-bed meandering rivers co-construct their own bankfull discharge and bankfull channel geometry? Analytical and numerical study
… slope, and bankfull discharge when the flow spills out onto the floodplain. No specific discharge is sufficient, however, to describe how the channel maintains itself. Above-bankfull flows increase the height of the floodplain and deepen the channel. Modestly below-bankfull flows drive …
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LARVAL FISH EXPORT IN RESPONSE TO VARYING COMPENSATING GATE DISCHARGE AT THE SAULT RAPIDS, ST. MARYS RIVER
… resource managers required information on how flow variability influences larval fish drift. I estimated annual larval fish export in relation to variable discharge during 2018-2021 and compared results to published habitat model predictions. Mean discharge and water temperature were lowest in …
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Systems Dynamics Simulation To Improve Timber Harvesting System Management
… harvest system - stand assignment and wood flow variability problems in the southeast United States. The Harvest System Assignment (HSA) model is used to evaluate the impact of a particular stand assignment on harvest system effectiveness and is designed to assist with harvest system …
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The influence of subglacial hydrology on the flow of West Antarctic ice streams
Subglacial hydrology is known to influence the flow of ice. However, difficulty in accessing the base of large ice sheets has made determining the interaction between ice streams, basal sediment and water difficult to discern. The aim of this thesis is to determine the influence of subglacial …
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The influence of hydrological variability on the spatial distribution and orientation of freshwater mussels (Bivalvia: Unionidae).
… southeastern Michigan was made using records of flow variability. The distribution and relative abundance of mussels (Bivalvia: Unionidae) was determined for three event (i.e., hydrologically flashy) and three stable (i.e., hydrologically stable) drainage basins. Multivariate analyses revealed …
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Determining lateral river channel activity with respect to safety of pipeline crossings
… and engineered do not affect the flow hydraulics and river regime. Therefore,<br/>pipeline crossing projects should be based on the study of natural processes including<br/>those which lead to lateral movement of the channel.<br/><br/>This study deals with the scientific knowledge …
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Tracking retreat processes at the Falljökull Glacier, SE Iceland
… melt and ice dynamics exhibits spatio-temporal variability. To address this, time-lapse images from Falljökull, SE Iceland, were analysed using Pointcatcher, a feature tracking software. Surface velocities and thinning rates were quantified for the period 2011-2013 and compared to results from …
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Spatio-temporal change in riparian woodlands of the Kruger National Park: drivers and implications
… in a multivariate time-series with river flow and rainfall data from nearby gauging and weather stations, respectively. Particular attention was paid to cumulative flow effects, as well as the frequency and magnitude of large infrequent disturbances (LIDs) such as droughts and floods, …
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Temporal and spatial scaling of coupled hydrological and biogeochemical processes in river basins
… the processes and factors controlling both the flow generation and nutrient retention mechanisms. An analysis framework that synthesizes the bottom-up and top-down approaches is implemented in this dissertation to explore these questions. In the top-down approach, empirical data from several …
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Legacy Nutrient Management and Remediation in Diverse Agricultural Watersheds
… Using the SWAT–VSA model calibrated for streamflow and total phosphorus (TP), this chapter examines long-term phosphorus export under current agricultural management. Results demonstrate that TP loads are highly persistent over decadal timescales, with a disproportionate contribution from …
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EFFECTS OF FLOW REGIME ON FISHES AND FISHERIES: FROM LIFE HISTORIES TO ECOSYSTEM SERVICES
Stream flow in freshwaters is considered a “master variable” influencing processes and traits from individual organisms to ecosystems. Due to this strong linkage, anthropogenic modification of flow regimes in freshwater ecosystems worldwide continues to have major impacts on populations, species, …
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Freeway Travel Time Estimation Based on Spot Speed Measurements
… research effort attempts to characterize typical variability in traffic conditions using traffic volume data obtained from loop detectors on I-66 Virginia during a 3-month period. The detectors logged time-mean speed, volume, and occupancy measurements for each station and lane combination. Using …
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