구조토(構造土)의 지형학적 해석 = Geomorphology of Patterned Ground(Strukturboden) in Cold Environment

다국어 초록 (Multilingual Abstract)

One of the most conspicuous and characteristic features of periglcial regions is patterned ground. This paper is to introduce these micro landforms and to interpretate their geomorphological significances. Patterned ground occurs almost entirely within the cold climate zones, the features that show marked sorting are certainly restricted to a climate where temperatures frequently fall below freezing-point and both frost and the formation of ground ice are fundamental factors in the origin of patterned ground.
Patterned ground occurs in both an active state and a fossil state. A subdivision of each shape is then based on the character of sorting, so that the classification is Circles, Nets, Polygons, Steps and Stripes. The features may grade into one another. The patterned ground is merely a surface materials change of the freezing soil regolith. This micro relief features are the result of simple hydrostatic build up of pressure during the freeze up period when unfrozen ground exists between the surface and the permafrost table(cryostatic hypothesis). The summit crater of the Mt. Halla, Jeju island or high mountains in Korea, some fossil patterned grounds and active earth hummocks are found. During the last cold ice-age, Korean peninsula must be experienced a strong periglacial climate regime and periglaciation.

Key Words; patterned ground, periglacial geomorphology, frost action