Journal article

Phase-shifts in shear stress as an explanation for the maintenance of pool-riffle sequences

SN Wilkinson, RJ Keller, ID Rutherfurd

EARTH SURFACE PROCESSES AND LANDFORMS | WILEY | Published : 2004

Abstract

The stability of the pool-riffle sequence is one of the most fundamental features of alluvial streams. For several decades, the process of velocity, or shear stress, reversal has been proposed as an explanation for an increase in the amplitude of pool-riffle sequence bars during high flows, offsetting gradual scour of riffles and deposition in pools during low flows. Despite several attempts, reversal has rarely been recorded in field measurements. We propose that, instead of being reversed, maxima and minima in shear stress are phase-shifted with respect to the pool-riffle sequence bedform profile, so that maximum shear stress occurs upstream of riffle crests at high flow, and downstream at..

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University of Melbourne Researchers