Abstract
Long-term sodar measurements (Aug 2008–Oct 2016) of wind and turbulence profiles with high spatial (10 m) and temporal (10 min) resolution were performed at the southern Bulgarian Black Sea coast. This data has provided an opportunity to define “rare” values of meteorological parameters within their statistical distributions and to identify them as extreme events according to the Intergovernmental Panel on Climate Change. The statistical analysis of wind speed profiles has been performed for the eight-year period using the two parameter Weibull distribution. The determination of the ninety-percentile of this statistical distribution (at every sodar measurement level from 30 up to 600 m) has given values (“rare” events) that have defined the theoretical extreme wind speed profile (reference profile). On this basis, the extreme profiles during the reviewed period have been determined. Analysis of the distribution of the situations with extreme weather events by months and hours for the entire period has been performed. The multiple time series with the registered extreme profiles have been used to derive averaged parameters defining the vertical structure of the coastal boundary layer during extreme events. The thermodynamic state of the coastal boundary layer according to the Pasquill-Gifford classification has been revealed.
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Acknowledgements
The work is within the frame of research projects DM 14/1 26-05-2020 (REPLICA—extReme Events and wind ProfiLe In a Coastal Area) project, funded by National Science Fund of Bulgaria and it was partially supported by the Bulgarian Ministry of Education and Science under the National Research Programme “Young scientists and postdoctoral students” approved by DCM # 577 /17.08.2018. The contribution of E. Batchvarova is supported by the National Science Fund of Bulgaria, Contract KP-06-N34/1 30-09-2020 “Natural and anthropogenic factors of climate change—analyses of global and local periodical components and long-term forecasts”.
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Barantiev, D., Batchvarova, E., Kirova, H., Gueorguiev, O. (2021). Climatological Study of Extreme Wind Events in a Coastal Area. In: Dobrinkova, N., Gadzhev, G. (eds) Environmental Protection and Disaster Risks. EnviroRISK 2020. Studies in Systems, Decision and Control, vol 361. Springer, Cham. https://doi.org/10.1007/978-3-030-70190-1_5
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