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| Titel |
The interaction of northern wind flow with the complex topography of Crete Island – Part 2: Numerical study |
| VerfasserIn |
I. Koletsis, K. Lagouvardos, V. Kotroni, A. Bartzokas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 6 ; Nr. 10, no. 6 (2010-06-07), S.1115-1127 |
| Datensatznummer |
250008221
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1115-2010.pdf |
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| Zusammenfassung |
| During the summer months, when northerly winds are blowing over the Aegean
Sea the island of Crete modifies significantly the regional airflow as well
as the pressure and temperature fields due to its complex topography. One of
the major topographical elements of Crete Island is the major gap which is
located between the two highest mountains Lefka Ori and Idi. On 24–25 August
2007 strong northerly winds, with gusts up to 25 m s−1, occurred at
the exit of the major gap. In order to investigate the dynamics as well as
the role of this elevated and sloping gap on the airflow modification, the
event was simulated down to 1 km horizontal resolution using the
non-hydrostatic model MM5. The model simulations show that the localized
intensification of the flow downstream of the major gap is related to the
channeling of the flow through the gap. The strongest winds are observed at
the gap exit region, implying that the main cause of the strong winds is the
pressure different between the gap entrance and exit, when the relatively
cooler maritime air approached the island and dammed up the high mountains.
Finally, sensitivity experiments with modified topography further supported
the important role of the topography of the elevated gap, which reveals that
the strong winds have aspects of both gap and downslope contributions over
the gap exit. |
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