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 14 of 14 for “"riverine system"”.
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Hyporheic flow in a mountainous riverine system
… model of water storage and flow through riverine valleys. The objective of this study was to determine the influence of instream beaver dams on vertical and lateral hyporheic exchanges. Hyporheic interactions were examined using hydrometric methods to determine both flow pathways and …
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Acoustical reverberation level modeling of underwater riverine system
Sonars used to count migrating salmon in the Pacific Northwest must operate in a complicated and variable acoustic environment. This paper discusses the acoustic properties which affect the performance of salmon enumeration methods. The methods used must be able to take into account variable site …
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Epiphytic Diatom Community Structure in a Karst Riverine System
<p>The goal of this study was to assess the epiphytic diatom community structure of two host species along a karst gradient in the upper Green River, Kentucky to a gain a better understanding of the role of diatoms in the food web. The host species studied were Podostemum ceratophyllum and …
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Water quality and sedimentation implications of installing a hydroelectric dam on the Río Baker in Chilean Patagonia
… alter the water quality of the original riverine system. Often temperatures, dissolved oxygen levels, and sediment loads in the reservoir and outflowing water are entirely different from those in the original free-flowing river; these differences alter aquatic ecology. With this in mind, …
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FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.
… suggest that Hg biomagnification in aquatic systems are dependent on two factors: a source of mercury and the potential for this mercury to become methylated. To compare the importance of these two factors in a riverine system I examine sites with varying sediment total mercury concentrations …
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FACTORS AFFECTING MERCURY BIOMAGNIFICATION IN RIVERINE FOOD WEBS IN THE ROCKY MOUNTAINS: CLARK FORK RIVER BASIN, MONTANA, U.S.A.
… suggest that Hg biomagnification in aquatic systems are dependent on two factors: a source of mercury and the potential for this mercury to become methylated. To compare the importance of these two factors in a riverine system I examine sites with varying sediment total mercury concentrations …
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Art, Ideology, and Politics at El Achiotal: A Late Preclassic Frontier Site in Northwestern Petén, Guatemala
… the Central Karstic Uplands and the wetland and riverine system to the west.</p><p>My results indicate that El Achiotal was settled during the transition from the Middle to Late Preclassic Periods. It subsequently grew into a small ceremonial center with monumental architecture that was decorated …
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The Effects of a Reservoir on Genetic Isolation in Two Species of Darters
The addition of dams into a riverine system causes a wide range of changes (i.e., sedimentation, erosion, thermal) to the river as well as to the fish assemblages of that river. Although there have been many studies documenting the changes that occur to the fish assemblages in the impounded river, …
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Demographics of Eastern South Dakota Wetlands and Wetland Basins and Techniques for Estimating the Area and Number of Wetland Basins
… South Dakota. Of these 899,277 ha, palustrine system wetlands covered 720,704 ha or 80.1% of the total area, lacustrine system wetlands and deepwater habitats covered 150,538 ha or 16.8% of the total area, and riverine system wetlands covered 28,034 ha or 3.1% of the total area. Lacustrine and …
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Modelling and empirical approaches for predicting the invasiveness of alien species.
… rates a critical component within this. In riverine ecosystems, dispersal can be inhibited by barriers and unidirectional flow in channels that are primarily linear channels, with establishment, dispersal and colonisation also affected by biological interactions with native biota. Here, …
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Physical suitability of sites for community-scale tidal power generation
… techniques, typically applied in a laboratory or riverine system, have been adapted to better suit the larger-scale, tidally energetic sites of interest here. The suite of functions produced includes: (1) image pre-processing tailored specifically to increasing the seeding density and reducing the …
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Dynamics of Social-ecological Traps: The Case of Small-scale fisheries in the Philippines
… human-environment interactions that drive a system into a social-ecological trap, a persistently unsustainable and undesirable social-ecological system. Recent research on social-ecological traps points to some gaps in the conceptualisation and analysis of these resilient yet pathological …
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Dynamics of Social-ecological Traps: The Case of Small-scale fisheries in the Philippines
… human-environment interactions that drive a system into a social-ecological trap, a persistently unsustainable and undesirable social-ecological system. Recent research on social-ecological traps points to some gaps in the conceptualisation and analysis of these resilient yet pathological …
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Sampling characteristics of the bus route survey technique in the James River, Virginia
… to compare the bus route technique in a large riverine system, I conducted four 4-day intensive sampling days, two weekend and two week days, in Areas 1 and 4 during each year. During these periods a complete as possible access-point survey was conducted simultaneously with the bus route …