A Single Equation for Calculating Z0N for Hydraulically Smooth, Transitionally Rough, and Fully Rough Turbulent Flows

Authors

  • Stephen C. Ertman

Keywords:

Nikuradse's roughness parameter, sand-grain roughness, shear velocity, shear stress, roughness Reynolds number

Abstract

The velocity-profile data from NIKURADSE'S (1950) seminal study was reexamined with modern curve-fitting software. A single equation was derived that describes the influence of bottom roughness on the velocity profile over a wide range of flow conditions, including hydraulically smooth, transitionally rough, and fully rough turbulent flows.

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Published

2000-10-28

Issue

Vol. 16 No. 4 (2000): Journal of Coastal Research

Section

Technical Communications

License

Authorization for personal use is granted by the Coastal Education and Research Foundation [CERF]. By submitting a manuscript, the authors agree that the copyright for their article is transferred to the publisher if the article is accepted for publication. Assignment of copyright is not required, however, from authors who work for organizations which do not permit such assignment, The copyright covers the exclusive rights to reprduce and distribute the article, inclduing reprints, photographic reproductions, microform, or any other reproductions of a similar nature, and translations.