Surface Wave Forces Acting on Submerged Logs
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 3
Abstract
Drag forces exerted on cylindrical simulated logs by flowing water are measured in a laboratory flume. Drag coefficient values calculated from these data are presented for a range of log submergence and slenderness values. Drag coefficients for large submergence values are consistent with those previously published. However, at submergence values less than eight element diameters, the observed drag coefficients are consistently higher than those previously published. This discrepancy is due to the additional drag created by stationary surface waves which causes the drag coefficient to increase considerably when a log is positioned near the free surface. This phenomenon, which has not been accounted for in previous studies on large woody debris, is shown to depend on log slenderness, submergence, and Froude number.
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Copyright © 2002 American Society of Civil Engineers.
History
Received: Apr 4, 2000
Accepted: Sep 18, 2001
Published online: Mar 1, 2002
Published in print: Mar 2002
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