Alejandro J. Vitale
Hydraulic resistance in mixed bedrock-alluvial meandering channels
Vitale, Alejandro J.; García, Marcelo H.; Fernández, Roberto; Vitale, Alejandro; Parker, Gary; Garcia, Marcelo
Marcelo H. García
Roberto Fernandez R.Fernandez@hull.ac.uk
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. https://doi.org/10.1080/00221686.2020.1780489
|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|
|Publisher||Taylor & Francis|
|Peer Reviewed||Peer Reviewed|
|Keywords||Alluvial cover; Bars; Bed roughness; Bedforms; Bedload; Hydraulic resistance; Meandering|
|Additional Information||Peer Review Statement: The publishing and review policy for this title is described in its Aims & Scope.; Aim & Scope: http://www.tandfonline.com/action/journalInformation?show=aimsScope&journalCode=tjhr20; Received: 2018-07-05; Accepted: 2020-05-10; Published: 2020-08-18|
This file is under embargo until Aug 19, 2021 due to copyright reasons.
Contact R.Fernandez@hull.ac.uk to request a copy for personal use.
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