동·서·남해안 25개 초지사구의 고도 분포 특성

Abstract

Characteristics of elevation distribution of grass-covered dunes and their relationships to tidal characteristics were investigated using cross-section measurement at 25 sites in Korean coast. Average elevations (from mean sea level) of the grass-covered dunes in the southern, eastern and western coast were 3.32, 4.01 and 5.65 m, respectively. To understand whether tidal level influences on the elevation distribution of grass-covered dunes, we calculated relative height of the elevation subtracting tidal levels. Average heights of the grass-covered dunes from Approximate Highest High Water Level (AHHWL) were 1.37, 3.85 and 1.99 m in each coast, respectively, showing comparatively smaller differences between the southern and western coast. Difference of average elevation of the places where herbaceous vegetation occurred, the starting point of sand-dune development, between the southern and western coast were 1.83 m, while relative height of from AHHWL were only 0.12 m in average. The differences of their relative heights from AHHWL were much smaller than those from Mean High Water Level, Mean High Water Springs Level or Mean High Water Neaps Level, suggesting grass-covered dunes of the southern and western coast are much influenced by tidal properties in the regions. In the eastern coast, difference of average elevation of the starting point of herbaceous vegetation and maximum significant wave height was only 0.19 m. It is also suggested that grass-covered dunes in the eastern coast are mainly affected by wave height.