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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 493201
Title Downstream fining, selective transport, and hillslope influence on channel bed sediment in mountain streams, Colorado Front Range, USA
Author(s) Menting, F.; Langston, A.L.; Temme, A.J.A.M.
Source Geomorphology 239 (2015). - ISSN 0169-555X - p. 91 - 105.
DOI https://doi.org/10.1016/j.geomorph.2015.03.018
Department(s) Soil Geography and Landscape
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2015
Abstract Channel bed sediment is composed of a combination of upstream and local hillslope sources. Factors that influence downstream changes in size, sorting, and lithological characteristics of bed material are complex. In order to better understand this complexity, we measured grain sizes and channel geometry on five streams draining the Colorado Front Range. The studied streams flow from steeply incised canyons in the mountains onto the gently sloping Colorado High Plains. Downstream fining occurs at the scale of the entire study reach (~. 30. km), but not in each individual stream. Differences between streams are likely related to watershed size and discharge characteristics. At smaller spatial scales within each stream, the fining pattern is less clear and is disrupted by lateral inputs from locally steep hillslopes in the incised canyons of the Front Range. However, the exclusion of local hillslope influence by distinguishing among individual lithologies in the channel bed material that are not present in the local hillslopes shows that fining also occurs over these smaller spatial scales. In the absence of steep hillslopes adjacent to the channels, bed sediment becomes a better mix of lithologies from the whole watershed rather than dominated by local hillslope sediment influx. We propose four dominant factors that control the channel bed characteristics in the study area: inheritance, hydrodynamics, lithologically controlled sediment abrasion rates, and differences in denudation rates throughout the watershed with associated differences in hillslope steepness. Combining these factors leads to a conceptual model that explains our observations and illustrates the complexity of the behaviour of bed material in steep mountainous regions and their bounding basins. Distinguishing among the different lithologies in the bed material was instrumental in decomposing and understanding the complex trends in this system. © 2015 Elsevier B.V.
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