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In situ determination of particle friction angles of fluvial gravels

Water Resources Research

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Abstract

Particle friction angles ?? represent the physical resistance to initial movement of a sediment particle and are therefore useful for relating initiation of motion to particular flows. We determined over 8000 friction angle values at five natural rivers by applying a new method that uses a digital load cell to directly measure the force F(d) required to pivot or slide a particle out of its natural resting place. Within each site, median ?? values were very similar to previously reported relations, yet different enough between sites that a location-general predictive empirical relation would produce errors in ?? of ??10 degrees for D(i)/K(s) > 1. Furthermore, within a D(i)/K(s) class at a given site the range in ?? was as large as 80??, much greater than the range of median values between classes for natural sediment mixtures. Using estimates of ??(c)/* from extensive bed load measurements made by Andrews and Erman [1986] at Sagehen Creek and the in situ ?? measurements made in this study together with, a theoretical model developed by Wiberg and Smith [1987], we show that ?? measurements made with this new method can be used to accurately predict ??(c)/* for natural, water-worked sediments. Additionally, these results confirm that a ?? value <

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
In situ determination of particle friction angles of fluvial gravels
Series title:
Water Resources Research
Volume
34
Issue:
8
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water Resources Research
First page:
2017
Last page:
2030