Myrhaug, D;
Simons, RR;
Holmedal, LE;
(2023)
Note on seabed shear stress beneath bichromatic and bidirectional waves for large bed roughness.
Coastal Engineering
, 184
, Article 104358. 10.1016/j.coastaleng.2023.104358.
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Abstract
The seabed shear stress beneath bichromatic and bidirectional waves is presented. The approach is analytical using the constant time-invariant eddy viscosity representation of Christoffersen and Jonsson (1985) for rough turbulent boundary layers under monochromatic waves for large seabed roughness. This formulation is extended to calculate the maximum bed shear stress beneath bichromatic and bidirectional waves by vectorial superposition of the shear stresses for each harmonic wave. Examples of results are given for bichromatic and unidirectional waves as well as bichromatic and bidirectional waves. Comparisons are also made with an equivalent monochromatic wave. The results appear to be in qualitative agreement with physical expectations. Finally, comparison is made with data from small scale laboratory experiments for seabed shear stress beneath bichromatic and unidirectional waves for large bed roughness yielding fair agreement between predictions and data.
| Type: | Article |
|---|---|
| Title: | Note on seabed shear stress beneath bichromatic and bidirectional waves for large bed roughness |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.coastaleng.2023.104358 |
| Publisher version: | https://doi.org/10.1016/j.coastaleng.2023.104358 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Bichromatic and bidirectional waves; Seabed shear stress; Large bed roughness; Time-invariant eddy viscosity; Comparison with data |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10174606 |
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