Stability and mobility of sand-bed channels affected by seepage

Rao, Achanta Ramakrishna and Sitaram, Nagaraj (1999) Stability and mobility of sand-bed channels affected by seepage. In: Journal of Irrigation and Drainage Engineering, 125 (6). 370-379 .

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Abstract

Seepage effects on the stability, mobility, and incipient motion of sand-bed particles are experimentally investigated. Seepage through a sand bed in a downward direction (suction) reduces the stability of particles, and it can even initiate their movement. The bed erosion is increased with the increased rates of suction. Whereas the seepage in an upward direction (injection) increases the stability of bed particles, it does not aid initiating their movement. The rate of bed erosion is reduced or even stopped by the increased infection rates. Hydrodynamic conditions leading to the so-called "pseudoincipient motion'' with suction (for the initiation of particles movement that are otherwise at rest under no-seepage conditions), and with injection (for only arresting the particles movement that are otherwise moving initially) are evaluated. The conventional Shields curve cannot be used to predict such pseudoincipient motion conditions with seepage. The concepts thus developed are useful for a better understanding of the sediment transport mechanics and in the design of stable alluvial channels affected by seepage.

Item Type:	Journal Article
Publication:	Journal of Irrigation and Drainage Engineering
Publisher:	American Society of Civil Engineers
Additional Information:	Copyright of this article belongs to American Society of Civil Engineers.
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	29 Jun 2011 08:43
Last Modified:	29 Jun 2011 08:43
URI:	http://eprints.iisc.ac.in/id/eprint/38779

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