CONSIDERATION ON FRICTION COEFFICIENT FOR SEA BOTTOM
PDF

Keywords

friction
friction factor
sea bottom
bed

How to Cite

Sawaragi, T., Iwata, K., & Kubo, M. (1976). CONSIDERATION ON FRICTION COEFFICIENT FOR SEA BOTTOM. Coastal Engineering Proceedings, 1(15), 33. https://doi.org/10.9753/icce.v15.33

Abstract

A bottom friction is an effective factor which will prove the deformation of progressive waves in shallow water, and many investigators have obtained the friction coefficients from field observations. However, they have not considered the effect of turbulent loss due to sand ripple at a sea bottom. The authors, first of all, study on the friction coefficient for artificial fixed ripple by using the boundary layer theory of rough turbulence, and a new formula on the friction coefficient is proposed. The proposed friction coefficients are compared with Zhukovets' experimental results which were performed on a movable bed, and it is found that the theoretical friction coefficients for artificial fixed ripple have to be modified in order to apply for the natural beach. Lastly, the wave deformation due to the bottom friction on the movable bed is calculated by the modified friction coefficient and the effect of bottom friction on the wave deformation is discussed.
https://doi.org/10.9753/icce.v15.33
PDF
Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.