Analyzing the footprints of near-surface aqueous turbulence: an image processing-based approach
In this contribution, a detailed investigation of surface thermal patterns on the water surface is presented, with wind speeds ranging from 1 to 7 m s − 1 and various surface conditions. Distinct structures can be observed on the surface—small-scale short-lived structures termed fish scales and larg...
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| Autori principali: | , , , , |
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| Natura: | Article (Journal) |
| Lingua: | inglese |
| Pubblicazione: |
18 March 2013
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| In: |
Journal of geophysical research. Oceans
Year: 2013, Volume: 118, Fascicolo: 3, Pages: 1272-1286 |
| ISSN: | 2169-9291 |
| DOI: | 10.1002/jgrc.20102 |
| Accesso online: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1002/jgrc.20102 Verlag, lizenzpflichtig, Volltext: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/jgrc.20102 
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| Note sull'autore: | J. Schnieders, C.S. Garbe, W.L. Peirson, G.B. Smith, and C.J. Zappa |
| Riassunto: | In this contribution, a detailed investigation of surface thermal patterns on the water surface is presented, with wind speeds ranging from 1 to 7 m s − 1 and various surface conditions. Distinct structures can be observed on the surface—small-scale short-lived structures termed fish scales and larger-scale cold streaks that are consistent with the footprints of Langmuir circulations. The structure of the surface heat pattern depends strongly on wind-induced stress. Consistent behavior regarding the spacing of cold streaks can be observed in a range of laboratory facilities when expressed as a function of water-sided friction velocity, u * . This behavior systematically decreased until a point of saturation at u * = 0.7 cm/s. We present a new image processing-based approach to the analysis of the spacing of cold streaks based on a machine learning approach to classify the thermal footprints of near-surface turbulence. Comparison is made with studies of Langmuir circulation and the following key points are found. Results suggest a saturation in the tangential stress, anticipating that similar behavior will be observed in the open ocean. A relation to Langmuir numbers shows that thermal footprints in infrared images are consistent with Langmuir circulations and depend strongly on wind wave conditions. |
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| Descrizione del documento: | Gesehen am 15.07.2021 |
| Descrizione fisica: | Online Resource |
| ISSN: | 2169-9291 |
| DOI: | 10.1002/jgrc.20102 |