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Hydraulic resistance in mixed bedrock-alluvial meandering channels

Vitale, Alejandro J.; García, Marcelo H.; Fernández, Roberto; Vitale, Alejandro; Parker, Gary; Garcia, Marcelo


Alejandro J. Vitale

Marcelo H. García

Alejandro Vitale

Gary Parker

Marcelo Garcia


We present an experimental analysis of hydraulic roughness variations due to changes in alluvial cover in a mixed bedrock-alluvial meandering channel with larger bedrock roughness than alluvial roughness. Three sets of experiments were conducted in a highly sinuous flume: one with bare bedrock, and two with enough sediment to cover 21% and 78% of the bedrock respectively. We compare our results with data from experiments previously conducted in the same flume with flat-and smooth-bed, and data from experiments with fully alluvial conditions. Our results show that: (i) hydraulic resistance in a mixed bedrock-alluvial channel changes with the degree of alluviation; (ii) hydraulic resistance is greater for bare-bedrock conditions, and decreases as sediment supply increases; (iii) if bedforms appear, hydraulic resistance may be larger than of bare bedrock conditions due to form drag; (iv) fluctuations in alluvial cover due to freely-migrating bars lead to instantaneous changes in hydraulic resistance.


Vitale, A. J., García, M. H., Fernández, R., Vitale, A., Parker, G., & Garcia, M. (in press). Hydraulic resistance in mixed bedrock-alluvial meandering channels. Journal of Hydraulic Research, 1-16.

Journal Article Type Article
Acceptance Date Dec 30, 2019
Online Publication Date Aug 18, 2020
Deposit Date Apr 3, 2020
Publicly Available Date Aug 19, 2021
Journal Journal of Hydraulic Research
Print ISSN 0022-1686
Electronic ISSN 1814-2079
Publisher Taylor and Francis
Peer Reviewed Peer Reviewed
Pages 1-16
Keywords Alluvial cover; Bars; Bed roughness; Bedforms; Bedload; Hydraulic resistance; Meandering
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