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Full-Text Articles in Social and Behavioral Sciences
Critical Thresholds For Sediment Mobility In An Urban Stream, Ross H. Martin
Critical Thresholds For Sediment Mobility In An Urban Stream, Ross H. Martin
Geosciences Theses
Bed load transport measurements were made in a small urban stream in Decatur, GA, from which thresholds for motion were calculated using methodologies from the published literature. These methodologies are discussed in terms of their limitations and assumptions. Mobility frequencies were calculated for single grains of each grain size fraction to illustrate the transition from size selective transport to equal mobility. In general, urban streams behave differently than many gravel rivers in non-urban settings because of differences in the availability and character of sediment sources and altered flow hydrographs. This comparison allows for discussion about the way sediment is transported …
Analysis Of Channel Networks And The Potential For Sediment Transport In The Vicinity Of The North Polar Seas Of Titan, Richard Cartwright
Analysis Of Channel Networks And The Potential For Sediment Transport In The Vicinity Of The North Polar Seas Of Titan, Richard Cartwright
Geosciences Theses
This study analyzes the available radar evidence in order to describe the morphology of channel networks around the north polar seas of Titan. Critical flow depths necessary to entrain water-ice grains, and denudation rates for a north polar channel network are discussed. The results indicate that channel networks on Titan have similar morphologies to channel networks cut by water on Earth. We also find that water-ice sediment should be readily entrained in the headwaters and downstream sections of the analyzed Titanian basin, given sufficient flow depths of liquid hydrocarbons. Also, the importance of slope and the elevated topography of the …