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Published on 30 July 2019

MUDFLOW PROCESSES IN AZERBAIJAN AND METEOROLOGICAL FACTORS OF THEIR FORMATION

Nabiev G. L.

The distribution of debris in the mudflow dangerous areas of the Azerbaijani Republic according to the materials of past debris flows (1891–2016). The limit of daily precipitation amounts needed to form mudflows (20 mm or more per day) was determined. It was found that mudflows occur with long, lasting for several hours rains, accompanied by short showers, intensity of 0.45–2.00 mm/min or more. Extreme values of mudflow rains on the southern slope of the greater Caucasus are 20–188 mm in the North-Eastern slope of the greater Caucasus with the Gobustan – 20–132 mm, in the Malyi Caucasus – 22–60 mm in Lankaran – 26–283 mm. A special attention is given to relations between types of atmospheric circulation prevailing over Europe and Siberia and synoptic conditions contributing to invasion of cold and humid air masses, leading to the loss of heavy rain, the peculiarities of the pressure fields (surface and altitude) to mudflow periods. Studying the circulation processes leading to the mudflow of storm water origin, it is established that they are determined by the invasion of cold and transformed air masses into the territory of Azerbaijan. It was found that in almost all cases during the period of mudflow formation there was a sufficient reserve of positive energy of instability and the level of convection often reached the surface of 300–200 GPA, and the specific humidity was characterized by high values. To identify the links between atmospheric circulation and mudflow in Azerbaijan, the types of circulation according to the Wangenheim G. classification were used and Dzerdzeevskii B. L. found that when enhancing the processes E in the study area is intensification of floods and the processes of mudflow formation weakened. Analysis of the relationships between debris flows and circulation patterns in B. L. Dzerdzeevsky found that mudflows in Azerbaijan are mainly formed in the 12 subtype (subtype Northern meridional circulation) and 13 l (subtype of the southern meridional circulation dominating in the summer).

CityBaku
CountryAzerbaijan
UDC551.509:551.58+551.31
Issue2019, № 2 (Т. 11)
Key wordsmudflows, precipitation, atmospheric circulation, meridional and zonal processes.
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Categories: Articles

Tags: осадки, сели, атмосферная циркуляция, меридиональные и зональные процессы.

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ISSN 1998-4502 (Print)                                                            ISSN 2499-975Х (Online)