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Showing 1 to 12 of 12 for “"bedrock river"”.
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The Dynamics of Coarse Sediment Transfer in an Upland Bedrock River
Bedrock channels in UK upland environments have received relatively little attention despite their importance within upland river systems and their influence on controlling the conveyance of sediment downstream. This thesis aims to quantify and model the transfer of coarse sediment through Trout …
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The transient response of bedrock river networks to sudden base level fall
… signal of adjustment propagates through the river network, progressively adjusting channels and hillslopes to the new conditions. When conditions favor incision, the rate and mechanism by which this signal propagates throughout the network determines basin response time. This ultimately …
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Investigating rates and mechanisms of lateral erosion in a small bedrock river using erosion pins, structure-from-motion photogrammetry, and optically stimulated luminescence dating: Konza Prairie, northeast Kansas
Bedrock rivers play a critical role in landscape evolution by leaving signatures of past climate shifts, base level changes, and tectonic uplift in the landscape. While much is known about the mechanics of vertical bedrock incision, the fluvial processes driving lateral bedrock erosion and the …
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The role of talus size distribution & the frequency of transport in wide and narrow valleys on bedrock valley widening: Buffalo National River, Arkansas
Bedrock river valleys are a valuable resource from which we learn about historic climactic changes, shifts in discharge and sediment inputs, movement of the river channel, and bedrock valley widening processes. Bedrock river valleys are often found in two end-member states: narrow, canyon-like …
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Equilibrium and transient morphologies of river networks : discriminating among fluvial erosion
… and transient morphology of alluvial and bedrock river networks. We apply analytical methods and an iterative model to solve for equilibrium slope-area and texture- area (in alluvial networks) relationships under different tectonic and climatic forcings. Transient morphology resulting from …
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Fluvial bedrock abrasion by bedload : process and form
Bedrock channels are a key component of the landscape. Pluvial bedrock incision sets the local base level, the boundary condition for hill slope processes, transmits tectonic and climatic signals throughout the landscape and transports sediments to sedimentary basins. Bedrock river networks are …
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Climatic and geodynamic influences on ocean island geomorphology
With homogeneous bedrock, dramatic rainfall gradients, and remnant surfaces that constrain their age, initial topography, and vertical motions relative to sea level, volcanic ocean islands provide an exceptional natural experiment in landscape evolution. Analyses traversing gradients in island …
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Stream piracy and glacial diversion of Little Missouri River, North Dakota
<p>Bedrock river terraces, as much as 275 to 500 feet above the present Little Missouri, are remnants of a former floodplain. The presence of these former shallow valley floor (Little Missouri Terrace No. 4) along the pre-glacial channel and east and north of the Killdeer Mountains suggests several …
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Laboratory experiments on alluvial cover in mixed bedrock-alluvial meandering channels and on the formation and evolution of supraglacial meltwater meandering streams
Rivers and other channels containing liquid flow develop meandering patterns over different media and across a broad range of scales. For example, alluvial rivers form and evolve by erosion and deposition of sediment, and by interactions with riparian vegetation. Meandering channels also form in …
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Structural, thermal, and geomorphic evolution of the eastern margin of the Tibetan Plateau
… of the controls on the spatial distribution of bedrock channel gradients in this landscape. Thermal histories of rocks along the margin inferred from *Ar/39Ar and (U-Th)/He thermochronology provide constraints on the long-term rates and distribution of denudation across this margin of the …
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Hillslope erosion and weathering rates in Earth's most rapidly uplifting mountains
… power-law volume-area scaling exponents than bedrock landslides, which has significant implications for accurately quantifying landslide erosion rates. By applying the landslide volume-area scaling relationship to over 15,000 landslides in the Tsangpo Gorge region of the eastern Himalaya, I …
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The Effect of Structure and Lithology on Aspect Ratio of Fluvial Channels: A Field-Based Quantitative Study of the New River in Three Geologic Provinces
… hydraulic variables. The width of mixed alluvial-bedrock channels generally is a function of discharge, with variations due to local conditions. The aspect ratio (width/depth) of channels is heavily influenced by substrate size and erodibility. How channel width and aspect ratio vary as a function …