关键词: 地形因子, 雨凇, 湖南

Abstract: In this paper, the relationship between glaze and topographical factors, such as elevation, terrain aspect and slope, are studied by using observations from 97 weather stations in Hunan Province and the 1:50 000 resolution Digital Elevation Model data of the province. The spatial distribution of annual glaze days shows that glaze days in southern Hunan Province are more than those in northern Hunan Province. One of regional maxima of glaze days in southern Hunan Province is along the windward slopes of the Xuefeng Range, the other one is along the windward slopes of the Nan Mountains. The maximum of glaze days over there is more than six days. Glaze days in lake areas of northern Hunan Province are more than that in mountain areas of northern Hunan Province. Elevation plays an important role but not the only role in the variation of glaze days at places higher than 200 m. However, it is not obvious at places lower than 200 m. Variation of glaze days seems to depend on terrain aspect but not terrain slope. Annual glaze days in the province increases with latitude, especially in those stations south of 28°N.

Key words: topographical factors, glaze, Hunan Province