Article
Physical basis for quasi-universal relations describing bankfull hydraulic geometry of single-thread gravel bed rivers
Journal of Geophysical Research
(2007)
Abstract
We examine relations for hydraulic geometry of alluvial, single-thread gravel bed rivers with definable bankfull geometries. Four baseline data sets determine relations for bankfull geometry, i.e., bankfull depth, bankfull width, and down-channel slope as functions of bankfull discharge and bed surface median sediment size. These relations show a considerable degree of universality. This universality applies not only within the four sets used to determine the forms but also to three independent data sets as well. We study the physical basis for this universality in terms of four relations, the coefficients and exponents of which can be back calculated from the data: (1) a Manning-Strickler-type relation for channel resistance, (2) a channel-forming relation expressed in terms of the ratio of bankfull Shields number to critical Shields number, (3) a relation for critical Shields number as a function of dimensionless discharge, and (4) a “gravel yield” relation specifying the (estimated) gravel transport rate at bankfull flow as a function of bankfull discharge and gravel size.
Disciplines
Publication Date
2007
DOI
https://doi.org/10.1029/2006JF000549
Citation Information
Peter Richard Wilcock. "Physical basis for quasi-universal relations describing bankfull hydraulic geometry of single-thread gravel bed rivers" Journal of Geophysical Research Vol. 112 Iss. F4 (2007) Available at: http://works.bepress.com/peter_wilcock/252/