نوع مقاله: مقاله اصلی
نویسندگان
1 استاد، گروه جغرافیا، دانشکده علوم انسانی، دانشگاه زنجان، زنجان، ایران
2 کارشناسی ارشد، گروه جغرافیای فیزیکی، دانشکده علوم انسانی، دانشگاه زنجان، رنجان، ایران
3 کارشناسی ارشد، گروه جغرافیای فیزیکی، دانشکده علوم انسانی، دانشگاه زنجان، زنجان، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The specific nature of heavy precipitation and its consequences have caused the phenomenon of particular importance in environmental planning and management of water. analysis Synoptic conditions of atmospheric circulation patterns and identifying factors affecting the occurrence of heavy precipitation are very important. In this study, to analyze the effect of low-pressure cut blocking system on the precipitation during 8 -13 March 2010, the weather maps of mean sea level pressure, geopotential height at 500 and 850 hPa level, wind components, moisture flux convergence and Omega indicators were analyzed. Using synoptic maps, position and movement of weather systems such as troughs and ridges, wind field, and high-pressure and low-pressure systems near the ground level were evaluated. The data of daily precipitation and hourly flow rate were analyzed for 29 meteorological stations and hydrometery within and outside the basin. The results suggest the establishment of Scut-off low in the East Mediterranean and its associated trough displacement and ground accompaniment during 8-13 March, which have provided the conditions for the creation of heavy rainfall. Wind field in atmospheric levels, especially at 850 hPa level, have an important role in humidity feeding of atmospheric systems. The negative values of Omega also resulted in the promotion of air aerodynamics in the atmospheric levels and strengthening of convective flows has led to precipitation.
کلیدواژه‌ها [English]
Dimitrova T., Mitzeva R. and Savtchenko A. (2009). Environmental conditions responsible for the type of precipitation in summer convective storms over Bulgaria. Atom. Res., 93(1), 30- 38.
Fragoso. M. and Tides. G. P. (2007). Classification of daily abundant rainfall patterns and associated large – scale atmospheric circulation types in southern Portugal. Int. J. Climatol., 28, 537-544.
Hellstrom C. (2005). Atmospheric conditions during extreme and non-extreme precipitation events in Sweden. Int. J. Climatol, 25, 631- 648.
Hosseos E. C., Lolis J. and Bartzokas A. (2008). Atmospheric circulation patterns associated with extreme precipitation amounts in Greece. Adv. Geosci.,17, 5- 11.
Lana A., Campins J., Genoves A. and Jansa A. (2007). Atmospheric patterns for heavy rain events in the Balearic Islands. Adv. Geosci., 12, 27-32.
Lashgari H., Ghaemi H., Hojati Z. and Amini M. (2012). Synoptic analysis of heavy precipitation in the Isfahan province. Phy. Geo. Res. Quar., 4, 99-116.
Masoudian S. A. and Mohamadi B. (2010). Synoptic analysis of heavy precipitation events in Iran. Iranian Geogr. Dev. J., 8 (19), 47 – 70.
Mofidi A, Janbaz Ghobadi G. and Zarrin A. (2011). Recognizing the synoptic patterns of wintertime heavy precipitation in the southern coast of the Caspian Sea. Geogr. Environ. Plan. J., 42, 23-40.
Mohapatra M. and Mohanty U.C. (2005). Some characteristics of very heavy rainfall over Orissa during summer monsoon season. J. Earth Syst. Sci., 114, 17- 36.
Schueneman K. C., Cassano. J. J. and Finnis J. (2008). Synoptic forcing of precipitation over Greenland: climatology for 1961 – 1999. J. Hydromet., 10, 60- 78.
Seibert P., Andreas F. and Formayer H. (2005). Synoptic and regional patterns of heavy precipitation in Austria. Accessed July, 2016. https://imp.boku.ac.at/envmet/tac_paper_revised.pdf,.
Yarahmadi D. and Mryanji Z. (2011). The analysis of dynamic and synoptic patterns of heavy rainfall in the south west of Caspian Sea and west of Iran (Case Study: rainfall on 04.11.2004). Phy. Geogr. Res. Quart., 43, 105-120 [In Persian].
)