Synoptic patterns of the flood rains of Gorgan River
Subject Areas : Geopolitic
بهلول Alijani
1
(ندارد)
طواق Gholparnian
2
(ندارد)
Keywords: Synoptic patterns, floods, pressure patterns and floods, Golestan
, 
, province, Gorgan River,
Abstract :
In order to study and identify the pressure patterns responsible for the floods of theGorgan River the dates of the sudden increase of daily discharge of the river wereextracted for each calendar month during the 1968-1998 period. For each calendarmonth one intensive and widespread flood was selected. The weather maps of thesedays at the surface and 500 hPa levels were analysed and the main pressure patternswere determined.The results showed four distinctive patterns: cyclonic, anticyclonic, warm front, andlocal cold front. The anticyclonic pattern was the most frequent one which is followedby the cyclonic pattern.
