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Paper Information

Journal:   WATERSHED ENGINEERING AND MANAGEMENT   2019 , Volume 11 , Number 1 #g00636; Page(s) 129 To 146.

Synoptic and dynamic analysis of flood generating systems in Mazandaran

* Geography Department, Payame Noor University, Tehran, Iran
Since the floods, both in terms of loss of life and property damage is one of the most devastating natural disasters in the world, synoptic and dynamic patterns identified flood creator not only reveals the mechanism of their formation, but to advance their knowledge and preparedness to face is also useful. The aim of the present study is to identify patterns causing floods in the Mazandaran Province to predict these patterns through before the flood could necessary precautionary measures to prevent the damage and take advantage of precipitation. In this research, two databases composed of two variables are necessary. A group of variables and atmospheric data including geopotential height at 500 hPa, zonal wind (uwnd), meridional wind (vwnd) and specific humidity (shum) in Synoptic four hours in the range of 0 to 80 degrees north and 0 to 120 degrees east at a spatial resolution 2. 5×2. 5 degree from the database (NCEP/NCAR) have been harvested and other groups of precipitation and discharge data in area, during 28 Aban to 2 Azar 1388. Then, taking advantage of environmental-circulation approach to mapping 500hpa circulation patterns, atmosphere thickness patterns of the levels1000-500 hPa, moisture flux convergence function and frontogenesis function in 500, 925 and 1000 hPa levels on the occurrence of floods. The results of this research showed that flood generating precipitation in the Mazandaran area is mainly caused by the eastern Mediterranean frontal lows. At the same time, thickness patterns have illustrated intense depressor zone that caused by meeting of cold air mass of the high latitude with humid and hot air mass of the southern Mediterranean. Analysis of the moisture flux convergence (MFC) patterns also showed that flood generating precipitation is caused by moisture flux of water masses of the Caspian Sea and Black Sea to the Mazandaran area. Analysis of the frontogenesis function maps indicated that occurrence of flood generating precipitation in the study area is caused by the formation and occurrence of front in the Caspian Sea and the Black sea in middle levels and east these two of water masses at lower levels of atmosphere (925 and 1000 hPa).
Keyword(s): Circulation pattern,Flood,Frontogenesis,Moisture flux convergence,Thickness patterns
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