독도 서도 남동해안의 애추 지형발달

Abstract

Taluses are usually developed at the boundary between slope and gravel beach in the Southeast Coast of Seodo, Dokdo. The largest one is about 50m long. Some valleys on a thick tuff layer are dissected by streams, because tuff is less resistant than trachyandesite to erosion in this coast. Therefore, a plenty of debris are supplied from these valleys. In this slope, we established three study transects (A, B, and C). The lower portion of these taluses is not dissected by wave erosion. It is related to the shallow strait about 2m depth between Dongdo and Seodo, because wave sediments delivered from offshore continuously fill the strait. The typical landscape of the taluses in the study area is presumed to have been shaped by geomorphic processes during the Quaternary. That is, the bottom of the talus is composed primarily of the debris originating from the glacial period, some of which are covered with the sediments delivered from the surrounding valleys during the postglacial period. The main factors that affectedthe development of these taluses are considered as follows; bedrock characteristics of the slope, density of lineaments, slope gradient, vegetation cover, and soil distribution.