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Effects of sediment supply on surface textures of gravel-bed rivers

Water Resources Research

By:
and
DOI: 10.1029/1999WR900232

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Abstract

Using previously published data from flume studies, we test a new approach for quantifying the effects of sediment supply (i.e., bed material supply) on surface grain size of equilibrium gravel channels. Textural response to sediment supply is evaluated relative to a theoretical prediction of competent median grain size (D'50). We find that surface median grain size (D50) varies inversely with sediment supply rate and systematically approaches the competent value (D'50) at low equilibrium transport rates. Furthermore, equilibrium transport rate is a power function of the difference between applied and critical shear stresses and is therefore a power function of the difference between competent and observed median grain sizes (D'50 and D50). Consequently, we propose that the difference between predicted and observed median grain sizes can be used to determine sediment supply rate in equilibrium channels. Our analysis framework collapses data from different studies toward a single relationship between sediment supply rate and surface grain size. While the approach appears promising, we caution that it has been tested only on a limited set of laboratory data and a narrow range of channel conditions.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of sediment supply on surface textures of gravel-bed rivers
Series title:
Water Resources Research
DOI:
10.1029/1999WR900232
Volume
35
Issue:
11
Year Published:
1999
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water Resources Research
First page:
3523
Last page:
3530
Number of Pages:
8