우리 나라 西海岸의 砂丘地形

Abstract

This is to report on the morphology of the coastal dunes of the western coast of Korea with reference to its structure and process. Authors conducted researches mainly on the 4 representative coastal dunes, which are: Tokgod, Sindu, Changgok, and Jangho-Yongjung(Fig.1). The results of the study are as follows. 1. Tokgod-A and Sindu coastal dunes are formed on the ground rock (schist) while Changgok and Tokgod-B coastal dunes on the previous sand bars (spits). This indicates that we can divide the coastal dunes of the western coast into ground rock oriented and sand bar oriented according to the relationship with the underlying structure. 2. The directions of sand dunes are closely related with the directions of the prevailing wind which blows N-S or N40-60W throught a year. Most of the sand dunes are oriented either N-S, N 40° -60° W or perpendicular to these directions. 3. The transformation and formation of the coastal dunes take place mostly between mid February and early May, when relative humidity is lower and wind velocity is higher than the other period of the year and the vegetation cover is not sufficient. The transformation and formation of sanddunes during cold winter and summer are negligible. 4. Most of the coastal dunes became stabilized recently except a few huge barchan dunes at Sindu area (Photo. 1.). Barchan dunes form some peculiar landforms such as composite depression made by a barchan dune and a U shape dune. The fact that the angle of repose of the lee slope of the barchan dune reaches 70° IS attributed to the high contents of moisture in the sediments.