Temporal Variation of Scour Depth at Nonuniform Cylindrical Piers
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 1
Abstract
The paper proposes a semiempirical model to estimate the temporal development of scour depth at cylindrical piers with unexposed foundations. A cylindrical pier with a foundation is considered as nonuniform pier. The concept of primary vortex and the principle of volumetric rate of sediment transport are used to develop a methodology to characterize the rate of evolution of the scour hole at nonuniform cylindrical piers. The model also simulates the entire scouring process at nonuniform cylindrical piers having the discontinuous surface located below the initial bed level. The scouring process includes three zones; viz Zone 1 having the scouring phenomenon similar to that of a uniform pier, Zone 2 in which the scour depth remains unchanged with its value equal to the depth of the top level of foundation below the initial bed level while the dimensions of the scour hole increase, and in Zone 3 the geometry pier foundation influences the scouring process. A concept of superposition using an effective pier diameter is proposed to simulate the scouring process in Zone 3. In addition, the laboratory experiments were conducted to utilize the laboratory results for the validation of the model. The simulated results obtained from the proposed model are in good agreement with the present experimental results and also other experimental data. Also, the effect of unsteadiness of flow is incorporated in the model and the results of the model are compared with the experimental data. The model agrees satisfactorily with the experimental data.
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Acknowledgments
The research is supported by the National Science Council of the R.O.C. The writers would like to thank Mr. Tien-Feng Chang and Mr. Ming-Cheng Peng of National Chung Hsing University for their technical assistance during the experiments.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 1 • January 2011
Pages: 45 - 56
Copyright
© 2011 ASCE.
History
Received: Sep 1, 2009
Accepted: Apr 27, 2010
Published online: May 1, 2010
Published in print: Jan 2011
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