GORGAN'S AVALANCHE GEOCOMPLEXES: FORMATION, PARAMETERS AND CLASSIFICATION

Abstract

In paper are present the result of avalanche geocomplex research in the territory of Grofa landscape (physico-geographical area – Gorgany, physico-geographical region – Seredniohirno-skibova oblast). The main avalanche hazard areas on the research territory are determine, distinguish and localised 22 avalanche geocomplexes on landscape reserve Grofa (Gorgany mountains massif, Ukrainian Carpathians) and adjacent territory.The physico-geographical factors of formation and development avalanche situation on landscape reserve Grofa are investigate. The place of this protected territory in the physico-geographical division into districts and it landscape structure. Inside the landscape reserve Grofa distinguish two altitude mistsevist’: alpine-subalpine stony highland and rapid-slope erosive-denudation midge.In articles are generalized basic methodical and methodological regulations about avalanche territory study in context of parametrization and accompanying research of avalanche geocomplex. The experience about typological classification research objects had analyzed. Represent methods of avalanche denudation index.Execute the basic parametrization of avalanche geocomplex on landscape reserve Grofa territory in accordance with linear and plane morphometric index. It is length, maximum and middle breadth, perimeter and area. On the base of avalanche geocomplexes aero-photograph decryption and determine forms this avalanche territory had classified. Between that, geocomplexes were distinguished four classification groups: zero, first, second and third order.On the basis of calculated indexes and calculating methods had studied and analyses index of avalanche denudation, including they dynamics.According to the research, it should be noted that for mountains Gorgan has an avalanche activity regardless of the exposure of slopes, which is due to considerable dismemberment of the territory. Within the landscape reserve of Grofa and adjoining territories, 22 avalanche geocomplexes are distinguished, which differ in their morphometric parameters, configuration and typological ranks. Most of the avalanche geocomplexes are ranked LH-1 and localized within the catchment reservoirs. The polygonal parameters, namely the area for the investigated areas, vary between 0.1-0.73 km2. Other morphometric parameters and their dynamic changes for the 5-year period are determined.Typically, avalanche complexes LH-0 and LH-1 are represented by straight and concave hypsometric profiles. For territories of the rank LH -2 and LH -3 characteristic step slopes are characteristic.In addition, on the basis of parametrization data, avalanche geocomplexes are characterized according to the criteria of formation and development, the groups of initial, mature and old investigated objects are distinguished. According to the elaborated data, an avalanche denudation rate calculated over a five-year period has been calculated from 1.938 × 10-3 to 2.022 × 10-3 mm / year.