Fluvial stability of a transverse vs. a longitudinal riprap protection
Fluvial stability of a transverse vs. a longitudinal riprap protection
An experimental study was conducted in a laboratory to determine the influence of length, width, and protrusion of non-continuous riprap protections on shear failure conditions. The incipient motion of particles as a failure criterion and the reference transport method as the threshold of motion were used. In each test, riprap transport rates were measured at different time intervals using a sediment trap. Results reveal that incipient motion conditions of transverse (cross-sectional) protections are strongly influenced by both the protrusion and length of bed protection, which indicates that stability significantly increases as protection length increases and decreases as protrusion increases. In the case of longitudinal protections, almost the same failure conditions were found as in the case of continuous protection. Furthermore, these conditions are unrelated to the width of the protection. A coefficient to correct design formulas obtained by other authors is proposed to take into account the effect of the geometry of transverse protections on their stability
de Almeida, Gustavo A. M.
f6edffc1-7bb3-443f-8829-e471b6514a7e
Martin-Vide, Juan P.
2587a91c-bc62-4602-bc31-4833fcb1ad9b
March 2011
de Almeida, Gustavo A. M.
f6edffc1-7bb3-443f-8829-e471b6514a7e
Martin-Vide, Juan P.
2587a91c-bc62-4602-bc31-4833fcb1ad9b
de Almeida, Gustavo A. M. and Martin-Vide, Juan P.
(2011)
Fluvial stability of a transverse vs. a longitudinal riprap protection.
Tecnología y ciencias del Agua.
Abstract
An experimental study was conducted in a laboratory to determine the influence of length, width, and protrusion of non-continuous riprap protections on shear failure conditions. The incipient motion of particles as a failure criterion and the reference transport method as the threshold of motion were used. In each test, riprap transport rates were measured at different time intervals using a sediment trap. Results reveal that incipient motion conditions of transverse (cross-sectional) protections are strongly influenced by both the protrusion and length of bed protection, which indicates that stability significantly increases as protection length increases and decreases as protrusion increases. In the case of longitudinal protections, almost the same failure conditions were found as in the case of continuous protection. Furthermore, these conditions are unrelated to the width of the protection. A coefficient to correct design formulas obtained by other authors is proposed to take into account the effect of the geometry of transverse protections on their stability
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Published date: March 2011
Organisations:
Water & Environmental Engineering Group
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Local EPrints ID: 356425
URI: http://eprints.soton.ac.uk/id/eprint/356425
PURE UUID: a0104783-7d05-4fa0-8e4c-5127eb18b809
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Date deposited: 10 Sep 2013 13:39
Last modified: 08 Jan 2022 03:21
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Author:
Juan P. Martin-Vide
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