天安市 木川邑 周邊의 丘陵斜面 削剝過程

Abstract

To find out the process of hillslope denudation, mass movement, since the Late Glacial in Chonan area, I collected the analyzing samples through trenching at the point of UJ-1 where is the valley head of Hanpyungnamugol located in the middle of Byungchon stream, and at the point of UJ-2 where is the valley mouth of Keunyeowoogogaegol. Stratiform interpretation and carbon age measurements had been conducted with the collected samples. The results are as follows; 2 inorganic and 2 organic matter layers were found at the point of UJ-1 and 6 inorganics and 3 organics at the point of UJ-2. In the whole area of investigation, the mass movements occurred in the unstable period of the hillslope in the Late Glacial had happened twice, once about 12,140yrB.P. before and once about 12,140~10,090yrB.P. before at the point of UJ-2. It found out that moor where formed during the stable period of the hillslope, comparatively, had been distributed about 12,140~10,090yrB.P. before. The mass movements occurred in the Holocene had happened twice about 2,240~1,630yrB.P. before, and confirmed to repeat the formation - destruction processes of the moor twice. At the point of UJ-2, the movement had been occurred 3 times in between 10,000~1,840yrB.P., formation of the moor confirmed once in 10,090~9,690yrB.P. and once in 2,250~1,840yrB.P.. It?s expected that this result will be an important preliminary data for reconstructing mass movement and climate change all over Chonan since the Late Glacial.