Research Article
May 1979
Flow Resistance in Cobble and Boulder Riverbeds
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VIEW THE REPLYAuthors: Daryl B. Simons, F.ASCE, Ruh-Ming Li, M.ASCE, and Khalid S. Al-Shaikh-Ali, M.ASCEAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 105, Issue 5
Abstract
Field and experimental evidence are presented to demonstrate the importance of the inflow of sand and gravel size sediments on resistance to flow in channels whose beds are primarily cobbles, rocks, and boulders. The released sediments fill the spaces between the larger roughness elements, forcing the channel to behave as a sand bed channel at a much reduced resistance to flow coefficient. Resistance to flow in these channels decreases, resulting in underestimations of:(1)Water discharge by a factor of two; (2)sediment discharge by a factor ranging between 8 and 64; and (3)velocity of flow by a factor of two. Failure to estimate these quantities with a reasonable degree of accuracy results in the following: (1)Underestimation of the actual quantity of available water; (2)improper selection of bank protection material; (3)overestimation of reservoir life; (4)unsafe design of scour depths at hydraulic structures; (5)improper design of location; location and (6)others relating to river control and development.
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Published In
Journal of the Hydraulics Division
Volume 105 • Issue 5 • May 1979
Pages: 477 - 488
Copyright
© 1979 American Society of Civil Engineers.
History
Published in print: May 1979
Published online: Feb 3, 2021
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Authors
Affiliations
Daryl B. Simons, F.ASCE
Assoc. Dean, Coll. of Engrg. and Prof. of Civ. Engrg., Colorado State Univ., Fort Collins, Colo., USA
Ruh-Ming Li, M.ASCE
Assoc. Prof. of Civ. Engrg., Colorado State Univ., Fort Collins, Colo., USA
Khalid S. Al-Shaikh-Ali, M.ASCE
Visiting Prof., Dept. of Civ. Engrg., Colorado State Univ., Fort Collins, Colo., on leave from Univ. of Mosul, Mosul, Iraq
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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.
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.