A Froude-scaled model of a bedrock-alluvial channel reach: 2. Sediment cover
نویسندگان
چکیده
منابع مشابه
Evaluating the controls of shear stress, sediment supply, alluvial cover, and channel morphology on experimental bedrock incision rate
[1] We explored the dependence of experimental bedrock erosion rate on shear stress, bed load sediment flux, alluvial bed cover, and evolving channel morphology. We isolated these variables experimentally by systematically varying gravel sediment flux Qs and water discharge Qw in a laboratory flume, gradually abrading weak concrete “bedrock.” All else held constant, we found that (1) erosion ra...
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In this study, the distribution of channel-bed sediment facies in the lowermost Mississippi River is analysed using multibeam data, complemented by sidescan sonar and compressed high-intensity radar pulse seismic data, as well as grab and core samples of bed material. The channel bed is composed of a discontinuous layer of alluvial sediment and a relict substratum that is exposed on the channel...
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[1] Bedrock erosion in mountain river channels ultimately sets the erosion rate of the surrounding hillslopes and the rate of sediment supply to the channels. The supply of coarse bed sediment acts as a dampening effect on further erosion by depositing an alluvial cover that temporarily obscures the bedrock. For landscapes where the residence time of the alluvial bed cover is comparable to the ...
متن کاملTransport slopes, sediment cover, and bedrock channel incision in the Henry Mountains, Utah
[1] Field data from channels in the Henry Mountains of Utah demonstrate that abundant coarse sediment can inhibit fluvial incision into bedrock by armoring channel beds (the cover effect). We compare several small channels that share tributary junctions and have incised into the same sedimentary bedrock unit (Navajo Sandstone) but contain differing amounts of coarse diorite clasts owing to the ...
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Interferometric Synthetic Aperture Radars (InSAR) have been used to measure several geophysical quantities such as topography, glacier flows and deformations [1]. To estimate the surface topography, the phase difference between two or more complex SAR images acquired using two slightly different flight paths or two physically separated antennas is used. Then through geometrical equations relati...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Earth Surface
سال: 2016
ISSN: 2169-9003
DOI: 10.1002/2015jf003709