Vortex structure and dynamics of Florida Keys waterspouts: 1974 field experiment, final report
| dc.contributor.author | Sinclair, P. C., author | |
| dc.contributor.author | Department of Atmospheric Science, Colorado State University, publisher | |
| dc.date.accessioned | 2022-07-21T17:25:39Z | |
| dc.date.available | 2022-07-21T17:25:39Z | |
| dc.date.issued | 1974 | |
| dc.description | Includes 2 different reprints of the article: Waterspout wind, temperature and pressure structure deduced from aircraft measurements by Verne H. Leverson and Peter C. Sinclair, Jospeh H. Golden. | |
| dc.description | Includes in its entirety Verne H. Leverson's M.S. thesis, "Waterspout structure and dynamics." | |
| dc.description.abstract | From direct penetrations of the waterspout funnel by specially instrumented aircraft, a quantitative description of the dynamic-thermodynamic structure of the waterspout has been developed. The Navier-Stokes equations of motion for the waterspout vortex are simplified by an extensive order of magnitude analysis of each term in the equations. The reduced set of equations provides a realistic mathematical model of the waterspout vortex. Further simplification shows that the cyclostrophic-Rankine combined vortex model accounts for, on the average, approximately 63% of the measured pressure drop from the environment to the waterspout core. The penetration measurements show that the waterspout funnel consists of a strong rotary and vertical field (radial component is smaller) of motion which results in a combined flow pattern similar to that of a helical vortex. In general, the measurements indicate that this one-cell vortex structure is the dominate configuration. However, several penetrations suggest reduced positive vertical velocities near the funnel core, and in one case, a downdraft core with vertical velocity of -0.8 msec-1. These measurements indicate that waterspout vortex may in some stages of development have a structure more closely described by the two-cell vortex such as discovered by Sinclair (1966, 1973) for the dust devil vortex. The temperature and pressure structure show that the waterspout, like the dust devil, is a warm core (ΔT = 0.1 to 0.5°C), low pressure (ΔP = -0.6 to -8.4 mb) vortex. All aircraft penetrations of the visible funnels were made within 150 m of cloud base at speeds of 55-65 msec-1. | |
| dc.format.medium | reports | |
| dc.identifier.uri | https://hdl.handle.net/10217/235453 | |
| dc.language | English | |
| dc.language.iso | eng | |
| dc.publisher | Colorado State University. Libraries | |
| dc.relation.ispartof | Publications | |
| dc.rights | Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. | |
| dc.subject | Waterspouts -- Florida -- Florida Keys | |
| dc.subject | Aeronautics in meteorology | |
| dc.title | Vortex structure and dynamics of Florida Keys waterspouts: 1974 field experiment, final report | |
| dc.type | Text |
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