ABSTRACT:

This study discusses characteristic of beach profile change and movement of vegetation belts at the sand barrier in the Nakdong river estuary, Korea, focusing on geomorphologic evolution and mobility of sand barriers in the view of coastal engineering. We carried out topography surveying with total station and level instrument and observed profile change of Jinu-do between 2008 and 2010. We set up representative profiles of all survey points and analyzed volume change at twelve representative profiles and migration distance of vegetation belt. Main results obtained are summarized as follows:

  1. Representative profile showed maximum volume change from Profile-1 to Profile-12. Profile-3 had maximum volume change and Profile-6, located at the center of Jinu-do, had minimum volume change. Results of 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. Beach profiles of Jinu-do show sediment deposited in the direction to east and west with Jinu-do as the center. In Profile-6, yearly average deposited volume of representative profiles estimated 298.28 cu. m/m

  3. Maximum migration distance of vegetation belt is 33.17 m. Except for Profile-9 and Profile-12, the other vegetation belt growth is toward offshore.

INTRODUCTION

For existing research of Beach profile change, natural beach profile changes generally according to the seasons, but maintains an overall equilibrium, reaching a stable state in comparison with annual sediment budgets. However, coastal area adjacent estuary is different from a natural beach because complex hydraulic characteristics changed by a lot of sediments, wave, current, and wind. Those bring about more complicated coastal morphological change. After the construction of the Nakdong estuary bank, the sand barriers in the estuary changed greatly, and they are continuously developing their directions towards the open sea (Busan Metropolitan City, 2004).

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