Seepage Effects on Sand‐Bed Channels
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 1
Abstract
Experiments were conducted to find the effects of seepage on flow over a sand bed in a straight rectangular flume under two conditions: (1) When the channel bed is plane, horizontal, and nontransporting; and (2) when the bed is transporting at a constant sediment concentration. Effects of both injection and suction, caused by seepage flow into and out of the channel bed, are studied for condition 1; and only suction effects are studied for condition 2. Three sands, of sizes 0.34 mm, 0.53 mm, and 0.80 mm, are used in the study. It is found that seepage can cause an increase or decrease in the bed shear stress relative to no seepage for the two conditions. The change in bed shear stress depends on the relative magnitudes of the bed shear stress and the critical shear stress of particles under the no‐seepage condition, sediment concentration, and the seepage rate. Quantitative relationships giving the ratio of bed shear stresses with and without seepage are presented for both conditions of the bed. A procedure to estimate the changes in bed shear stress, friction factor, Manning's , and stream power due to seepage for known initial conditions of the channel and the amount of applied seepage is presented.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 120 • Issue 1 • January 1994
Pages: 60 - 79
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Sep 27, 1991
Published online: Jan 1, 1994
Published in print: Jan 1994
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