MOVABLE BED ROUGHNESS IN THE FLOW OF IRREGULAR WAVES AND CURRENTS OVER MOVABLE BEDS
PDF

Keywords

movable bed
bed roughness
bed
irregular waves
current

How to Cite

You, Z.-J., & Nielsen, P. (1996). MOVABLE BED ROUGHNESS IN THE FLOW OF IRREGULAR WAVES AND CURRENTS OVER MOVABLE BEDS. Coastal Engineering Proceedings, 1(25). https://doi.org/10.9753/icce.v25.%p

Abstract

The bed roughness ks in the flow of irregular waves and currents over a movable bed is studied on the basis of measured current profiles and the model of You (1994). It is found that the movable bed roughness kt is affected by both waves and currents and that the existing formulae derived in purely oscillatory flow generally fail to predict ks in the flow of waves and currents. A new formula is proposed to calculate k, in the flow of irregular waves and currents over a movable bed. The present bed roughness formula together with You's (1994) model gives better prediction of current shear velocity u^, and especially apparent roughness z, than the existing formulae derived in purely oscillatory flow.
https://doi.org/10.9753/icce.v25.%25p
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.