Comparison of Beach Profile Change and Migration of Vegetation Belts at Sand Barrier in Nakdong River Estuary, Korea

摘要

This study discusses characteristic of beach profile change andmovement of vegetation belts at the sand barrier in the Nakdong riverestuary, Korea, focusing on geomorphologic evolution and mobility ofsand barriers in the view of coastal engineering. We carried outtopography surveying with total station and level instrument andobserved profile change of Jinu-do between 2008 and 2010. We set uprepresentative profiles of all survey points and analyzed volume changeat twelve representative profiles and migration distance of vegetationbelt. Main results obtained are summarized as follows: (1)Representative profile showed maximum volume change from Profile-1to Profile-12. Profile-3 had maximum volume change and Profile-6,located at the center of Jinu-do, had minimum volume change. Resultsof daily average change velocity at Jinu-do, Profile-3 is 0.140 cu.m/m/day and Profile-6 is -0.013 cu. m/m/day, respectively. (2) Beachprofiles of Jinu-do show sediment deposited in the direction to east andwest with Jinu-do as the center. In Profile-6, yearly average depositedvolume of representative profiles estimated 298.28 cu. m/m (3)Maximum migration distance of vegetation belt is 33.17 m. Except forProfile-9 and Profile-12, the other vegetation belt growth is towardoffshore.