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Observations of bedforms on a dissipative macrotidal beach
| Content Provider | Paperity |
|---|---|
| Author | Russell, Paul Miles, Jon Thorpe, Antony Masselink, Gerd |
| Abstract | Field measurements of wave ripples and megaripples were made with a Sand Ripple Profiler in the surf and shoaling zones of a sandy macrotidal dissipative beach at Perranporth, UK in depths 1–6 m and significant wave heights up to 2.2 m. A frequency domain partitioning approach allowed quantification of height (η), length (λ) and migration rate of ripples and megaripples. Wave ripples with heights up to 2 cm and wavelengths ∼20 cm developed in low orbital velocity conditions (u m < 0.65 m/s) with mobility number ψ < 25. Wave ripple heights decreased with increasing orbital velocity and were flattened when mean currents were >0.1 m/s. Wave ripples were superimposed on top of megaripples (η = 10 cm, λ = 1 m) and contributed up to 35 % of the total bed roughness. Large megaripples with heights up to 30 cm and lengths 1–1.8 m developed when the orbital velocity was 0.5–0.8 m/s, corresponding to mobility numbers 25–50. Megaripple heights and wavelengths increased with orbital velocity but reduced when mean current strengths were >0.15 m/s. Wave ripple and megaripple migrations were generally onshore directed in the shoaling and surf zones. Onshore ripple migration rates increased with onshore-directed (+ve) incident wave skewness. The onshore migration rate reduced as offshore-directed mean flows (undertow) increased in strength and reached zero when the offshore-directed mean flow was >0.15 m/s. The migration pattern was therefore linked to cross-shore position relative to the surf zone, controlled by competition between onshore-directed velocity skewness and offshore-directed mean flow. |
| Starting Page | 225 |
| Ending Page | 239 |
| File Format | HTM / HTML |
| ISSN | 16167341 |
| DOI | 10.1007/s10236-013-0677-2 |
| Issue Number | 2 |
| Journal | Ocean Dynamics |
| Volume Number | 64 |
| e-ISSN | 16167228 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2014-01-11 |
| Access Restriction | Open |
| Subject Keyword | Ripples Megaripples Surf zone Ripple migration Sand ripple profiler Dissipative beach |
| Content Type | Text |
| Resource Type | Article |
| Subject | Oceanography |
