DBPapers
DOI: 10.5593/sgem2011/s13.116

IDENTIFICATION OF CIRCULATION PATTERNS PRODUCING FLASH FLOODS OVER SOUTH-WEST OF IRAN

AUTHOR/S: B. NAJAFPOUR
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 2, 873-886 pp

ABSTRACT

In this study, to identify circulation patterns producing flash flood in the South-West of Iran, 51 large floods in the Qantareh Station have been selected which have been among the data from the daily flood in a period of 30 years of Mond basin. The Mond basin is
one of the sub-basin of Persian Gulf Basin and is located in south west of Iran. Then, the hydrologic features of selected floods have been calculated. Afterwards, hydrologic features of these floods using mean and standard deviation have been standardized.
Then performing a cluster analysis via Ward integration method the data of six main groups of flood have been derived. Finally one day was determined as a sample day of each group to perform synoptic analysis of precipitation days causing the flood of
sample day via the environment-to-circulation procedure. To analyze precipitation days synoptically, maps of sea level pressure(SLP), geopotential height, temperature, specific moisture of 500 hPa level and Isohyets maps of daily basin have been used. The upper
atmosphere data have been provided from NCEP\NCAR database. In this paper, only the synoptic analysis of precipitation days of sample flood of flood cluster number 4 is provided. The results showed that precipitation cluster providing sample flood of flood cluster number 4 were due to synoptic conditions of locating a cut-off low in the East Mediterranean and South of Black Sea.

Keywords: circulation patterns, geopotential height, cluster analysis, flash flood, Iran

PAPER 2011/s13.116: IDENTIFICATION OF CIRCULATION PATTERNS PRODUCING FLASH FLOODS OVER SOUTH-WEST OF IRAN

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