2018
DOI: 10.1029/2017jf004533
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Morphodynamics of a Width‐Variable Gravel Bed Stream: New Insights on Pool‐Riffle Formation From Physical Experiments

Abstract: Field observations, experiments, and numerical simulations suggest that pool‐riffles along gravel bed mountain streams develop due to downstream variations of channel width. Where channels narrow, pools are observed, and at locations of widening, riffles occur. Based on previous work, we hypothesize that the bed profile is coupled to downstream width variations through momentum fluxes imparted to the channel surface, which scale with downstream changes of flow velocity. We address this hypothesis with flume ex… Show more

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Cited by 68 publications
(139 citation statements)
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“…Constructed riffle-pool sequences are especially popular restoration designs because of their perceived stability and benefits for aquatic ecology (Bernhardt et al, 2005;Wohl et al, 2005). Experimental results suggest that pools can be forced through manipulations of riffle height and width (Anim et al, 2019;Chartrand et al, 2018;Newbury, 2013), but it is not clear what hydraulic and sedimentary conditions are necessary to ensure that the introduced modifications are viable for a suitable design life. This gap is perpetuated by a lack of effective post-construction monitoring of instream restoration projects (Bernhardt et al, 2007;Miller & Kochel, 2009;Morandi et al, 2014;Poppe et al, 2016).…”
Section: Introductionmentioning
confidence: 99%
“…Constructed riffle-pool sequences are especially popular restoration designs because of their perceived stability and benefits for aquatic ecology (Bernhardt et al, 2005;Wohl et al, 2005). Experimental results suggest that pools can be forced through manipulations of riffle height and width (Anim et al, 2019;Chartrand et al, 2018;Newbury, 2013), but it is not clear what hydraulic and sedimentary conditions are necessary to ensure that the introduced modifications are viable for a suitable design life. This gap is perpetuated by a lack of effective post-construction monitoring of instream restoration projects (Bernhardt et al, 2007;Miller & Kochel, 2009;Morandi et al, 2014;Poppe et al, 2016).…”
Section: Introductionmentioning
confidence: 99%
“…The topographic filter ( Figure 1a) is modulated by feedbacks between the local bed topography and the flow, through volume conservation for the CV shown. Over surface areas of roughly w ′2 , spatial variations of bed topography and channel width regulate the average downstream flow velocity Ū x (Furbish et al 1998;Thompson et al 1999;MacWilliams et al 2006;MacVicar and Roy, 2007;Thompson and McCarrick, 2010;MacVicar and Rennie, 2012;MacVicar and Best, 2013;Chartrand et al 2018). Ū x , and in particular the downstream change in Ū x (i.e.…”
Section: T U Bmentioning
confidence: 99%
“…As a result, an alternative length scale choice for L c is the local channel width w, which we abbreviate as L m (morphologic length scale)(cf. Chartrand et al 2018;Yanites, 2018). Using L c ∼L m , Equation 13is alternatively expressed as:…”
Section: Nondimensional Hiranomentioning
confidence: 99%
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