Research Article
Mar 1981
Ultimate Dimensions of Local Scour
Authors: Fred W. Blaisdell, F.ASCE, George G. Hebaus, M.ASCE, and Clayton L. Anderson, M.ASCEAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 107, Issue 3
Abstract
A mathematical method is presented for determining the ultimate dimensions of local scour from relatively short term measurement of the progression of scour with time. The method involves plotting the logarithm of the rate of change of the scour dimension against the logarithm of time. A hyperbolic curve is fitted to the plotted data, and the asymptote of the hyperbola is used to determine the ultimate scour dimension. A example is used to compare the hyperbolic logarithmic method with the linear logarithmic and linear semilogarithmic methods (in which the scour depth increases without limit) which require an estimate of the time required to reach a practical equilibrium. The hyperbolic logarithmic method predicts both the time progression of scour and the ultimate scour dimensions.
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Published In
Journal of the Hydraulics Division
Volume 107 • Issue 3 • March 1981
Pages: 327 - 337
Copyright
© 1981 American Society of Civil Engineers.
History
Published in print: Mar 1981
Published online: Feb 3, 2021
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Authors
Affiliations
Fred W. Blaisdell, F.ASCE
Research Hydr. Engr., United States Dept. of Agr., Sci. and Education Administration, Agricultural Research, St. Anthony Falls Hydr. Lab., Third Avenue Southeast at Mississippi River, Minneapolis, Minn. 55414
George G. Hebaus, M.ASCE
Research Hydr. Engr., United States Dept. of Agr., Sci. and Education Administration, Agricultural Research, St. Anthony Falls Hydr. Lab., Third Avenue Southeast at Mississippi River, Minneapolis Minn. 55414
Clayton L. Anderson, M.ASCE
Hydr. Engr., United States Dept. of Agr., Sci. and Education Administration, Agricultural Research, St. Anthony Falls Hydr. Lab., Third Avenue Southeast at Mississippi River, Minneapolis, Minn. 55414
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.