Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Variations of Sediment Textural Parameters and Topography around Gangneung Harbor after the Completion of Harbor Construction

강릉항 완공 후 주변해역의 퇴적물 조직변수와 지형의 변화

  • 오재경 (인하대학교 해양과학과) ;
  • 방기영 (인하대학교 해양과학과)
  • Received : 2013.01.31
  • Accepted : 2013.04.06
  • Published : 2013.04.30
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Abstract

To investigate the changes in depositional environment around Gangneung Harbor, we analyzed the surface sediment textural parameters and topography data collected five times from February 2007 to February 2009. In the study area, sediments were mainly composed of sand and its sediment size became finer at offshore sites. During summer time, however, the sand grains became coarser than winter season near Namhangjin Beach, inside the harbor, and offshore areas. On the other hand, the grain size of Anmok Beach showed a gradual finer trend with time. Compared with the previous studies conducted before the completion of Gangneung Harbor construction, the mean grain size became finer on Anmok Beach, while it was coarser on Namhangjin Beach. The bathymetric changes observed over a 2-year period showed predominant erosion in the area of 5 to 10 m water depths and deposition in 2 to 5 m water depths. The shallower area less than 2 m water depths showed an alternating trend and yet slightly more dominant erosion process. The sediment textural parameters and the distribution of erosion and deposition have changed continuously. Results imply that such changes show long-term trends as well as seasonal variations in which the trend may have been formed after the completion of Gangneung Harbor construction.

강릉항 주변 해역의 퇴적환경의 변화 특성을 파악하기 위해 2007년 2월부터 2009년 2월까지 총 5회에 걸쳐 획득한 퇴적물의 조직변수와 측량 자료를 분석하였다. 연구지역의 퇴적물은 주로 모래로 이루어져 있고 외해 방향으로 갈수록 입도가 세립해진다. 하계에 평균입경은 외해역, 강릉항 내측, 남항진 해빈에서 동계보다 조립하게 나타났으며, 안목 해빈에서는 점차적으로 세립해지는 양상을 나타냈다. 강릉항 완공 전의 연구 결과와 비교할 때, 강릉항 완공 후 평균입경은 안목 해빈에서 세립해졌으나, 남항진 해빈에서 조립해졌다. 2년간의 침 퇴적 양상을 보면, 수심 5-10 m 사이 지역에서는 침식이, 수심 2-5 m 사이 지역에서는 퇴적이 우세하며, 수심이 2 m 보다 얕은 지역에서는 침식과 퇴적이 교호하는 형태로 침식이 다소 우세하게 나타났다. 연구지역의 퇴적물 조직변수와 침 퇴적 분포는 지속적으로 변화하고 있다. 이러한 변화는 계절적인 변동뿐만 아니라 장기변화 추이 양상을 보이고 있고, 강릉항 완공 후 장기변화 추이는 유지되는 것으로 생각된다.

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