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 45 for “"Stream Network"”.
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Headwater stream network connectivity: biogeochemical consequences and carbon fate
… simple nor static environments. Heterogeneous stream corridors constitute the majority of river network length and regulate cycling of carbon and oxygen as they expand and contract their connections across the landscape. Though headwater streams integrate many biogeochemical signals from the …
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Numerical modeling of groundwater-driven stream network evolution in low-relief areas
Fluvial channel networks are observed to grow in unchannelized areas of low relief despite the low potential energy for erosion in these areas of low slope. Under these low slope conditions significant channel growth only occurs when water is collected and flows as concentrated discharge in …
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Influences of Mountainside Residential Development to Nutrient Dynamics in a Stream Network
… and services (e.g., water supply) to downstream ecosystems and human communities. Fast-growing mountainside residential development not only modifies the terrestrial system but also aquatic systems by changing the nutrient input from the terrestrial to aquatic. However, the impacts of …
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Spatiotemporal response of aquatic native and nonnative taxa to wildfire disturbance in a desert stream network
Many native freshwater animals are imperiled as a result of habitat alteration, species introductions and climate-moderated changes in disturbance regimes. Native conservation and nonnative species management could benefit from greater understanding of critical factors promoting or inhibiting …
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Effects of stream network topology on fish assemblage structure and bioassessment sensitivity in the mid-Atlantic highlands, USA
Stream fish assemblages exist within stream networks defined by the size and proximity of connected streams (i.e., stream network topology). The spatial position of sites within stream networks may therefore regulate opportunities for fish dispersal to access distant resources or colonize "new" …
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State-space models for stream networks
The natural branching that occurs in a stream network, in which two upstream reaches merge to create a new downstream reach, generates a tree structure. Furthermore, because of the natural flow of water in a stream network, characteristics of a downstream reach may depend on characteristics of …
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Fractal and Multifractal Analysis of Runoff Time Series and Stream Networks in Agricultural Watersheds
… of fractal scaling behavior of runoff and stream network morphometry in agricultural watersheds has not been previously reported. In the present study, fractal and multifractal scaling of daily runoff rate in four experimental agricultural watersheds and their associated sub-watersheds (32 …
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New data structure and process model for automated watershed delineation
DEM analysis to delineate the stream network and its associated subwatersheds are the primary steps in the raster-based parameterization of watersheds. There are two widely used methods for delineating subwatersheds. One of these is the Upstream Catchment Area (UCA) method. The UCA method employs a …
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Scale dependent genetic structure of Idaho Giant salamanders (Dicamptodon aterrimus) in stream networks
Stream network structure constrains population processes of freshwater organisms, with individual, population and community level consequences. This consistent structure provides a framework in which examination of life-history influences on population genetic structure may provide general insight. …
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Scale dependent genetic structure of Idaho Giant salamanders (Dicamptodon aterrimus) in stream networks
Stream network structure constrains population processes of freshwater organisms, with individual, population and community level consequences. This consistent structure provides a framework in which examination of life-history influences on population genetic structure may provide general insight. …
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Development and evaluation of a stream temperature component within the PRMS watershed modeling program
Stream temperature is becoming a very important factor in water quality and the health of many aquatic ecosystems. Computer modeling software can help predict the response of watershed and stream systems to changes in climate or other conditions. This thesis project concerns the development of a …
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A Limnological Analysis of Lake Manassas, with an Updated Baseline Through 2010
… desired standards. Nutrient loading occurs via a stream network with the largest contributor being Broad Run which is consistent with previous water quality studies. The lake serves as the sole water source for nearly 40,000 residents and businesses and ensuring clean and safe water is of …
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A GIS evaluation of land use dynamics and fish habitat in the salmon river watershed - Langley, B.C.
… and processes associated with fish habitat and streamside land use relationships. Geographic Information System techniques were used to analyze the land use data and to display the results. The distribution and temporal changes in land use from1979-80 to 1989-90 are examined in three ways: 1) an …
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The role of dispersal networks in structuring biotic communities: A tale of streams and metacommunity theory
… may vary temporally and spatially. In dendritic stream networks, headwater streams are isolated when compared to more centrally located mainstem stream sections. I investigated the potential for stream networks to influence the relative influence of local and regional processes via a survey and …
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A new passive surface water flux meter for simultaneous measurement of contaminant and water fluxes in streams and rivers
… of contaminant concentration/flux in rivers and streams is described and tested. The novel PSFM design was developed for portability and ease of adaptability for a variety of contaminant classes. Although previous designs have been evaluated under constant flow conditions, the PSFM has never been …
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Effects of Watershed and Habitat Conditions on Stream Fishes in the Upper Roanoke River Watershed, Virginia
… - 30, and 70 - 80 km². I correlated physical in-stream conditions with proportions of forest, disturbed, and herbaceous/agricultural land at various watershed-scales to determine factors affecting stream habitat. I grouped fishes into metrics commonly used in indexes of biotic integrity and …
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Population Dynamics and Connectivity Patterns of Adfluvial and Stream-Resident Cutthroat Trout
… that resides in Summit Lake and its tributary stream network. The objectives of this research were to (1) examine the population dynamics of stream- and lake-dwelling LCT in the context of drought, (2) quantify the amount of stream-resident versus adfluvial life histories in an adfluvial …
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Quantifying Solute and Water Fluxes in Headwater Streams Using Passive Flux Meters
… chemistry at one or many locations throughout a stream network while minimizing cost and sampling time. A passive flux meter (PFM) simultaneously estimates time-averaged water and solute mass fluxes in flowing water. PFMs have been used in groundwater to quantify contaminant flux but have been …
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Distribution and Population Characterization of Clinch Dace (Chrosomus sp. cf. saylori) in the Upper Clinch River System, Virginia
… Clinch Dace occupied low-gradient headwater streams with relatively low conductivity in forested watersheds. My surveys uncovered two new tributaries occupied by Clinch Dace, and I was unable to find Clinch Dace in two historically occupied streams. Species detection probability was higher …
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Habitat Associations Of Stream-Dwelling Salamanders At Multiple Spatial Scales In Central Kentucky Headwaters.
<p>Headwater stream systems are productive habitats that are often at risk of human perturbation, and it is crucial that ecologists understand natural patterns and processes within these ecosystems. Using a multi-scale approach, I investigated factors influencing habitat associations of …
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