Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Development of Apparatus and Methods for Understanding the Dynamics of the Western Boundary Current

서안경계류 역학을 이해하기 위한 실험 장치 및 방법 개발

  • Jang, Swung-Hwan (Division of Science Education, Institute of Fusion Science, Chonbuk National University) ;
  • Shin, Jung-Sun (Division of Science Education, Institute of Fusion Science, Chonbuk National University) ;
  • Moon, Byung-Kwon (Division of Science Education, Center for Bridging Advanced Science and Education, Chonbuk National University)
  • 장승환 (전북대학교 과학교육학부, 융합과학연구소) ;
  • 신정선 (전북대학교 과학교육학부, 융합과학연구소) ;
  • 문병권 (전북대학교 과학교육학부, 첨단과학교사연수센터)
  • Received : 2010.02.08
  • Accepted : 2010.02.17
  • Published : 2010.02.26
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Abstract

A simple laboratory device and methodology are developed for deep understanding of the western boundary current (WBC). The apparatus consists of a rotating (count-clockwise) rectangular tank with a sloping bottom in order to simulate the beta effect, the variation of the Coriolis parameter with latitude. We also used a clockwise rotating disk at the surface water to mimic the wind stress forcing in mid-latitude oceans. Four experiments were carried out using some combination of a bottom type and a rotation of the tank. Experiment with the beta effect clearly demonstrated the WBClike flow as well as the Sverdrup interior. However, the water in a tank gave rise to an inertial motion under the influence of a constant Coriolis force alone. We also discussed a stiffening of the rotating fluid on the basis of the Taylor-Proudman effect. We believe that the apparatus and methods developed in this study help to understand the WBC due to the beta effect.

서안경계류의 발생 역학을 이해하기 위하여 간단한 실험 장치와 방법을 개발하였다. 위도에 따른 코리올리 파라미터의 변화(즉 베타효과)를 구현하기 위하여 바닥이 경사진 반 시계 방향으로 회전하는 수조를 이용하였다. 중위도 해양에 작용하는 바람 응력은 수조 상부에서 시계 방향으로 회전하는 원판으로 대신하였다. 수조 바닥의 형태와 수조의 회전 유무의 조합으로 구성된 4가지 실험을 수행하였다. 그 결과, 베타효과가 포함된 실험에서 서안경계류와 유사한 흐름과 스베드럽 영역을 볼 수 있었다. 반면에, 베타효과 없이 일정한 코리올리 힘만 있을 때는 수조 속의 물은 관성류의 특징을 나타냈다. 우리는 또한 회전 유체가 굳어진 것처럼 변한다는 테일러-프라우드만 효과를 확인 하였다. 이 연구에서 개발된 장치와 방법은 베타효과에 의한 서안경계류를 이해하는 데 도움을 줄 것으로 기대한다.

Keywords

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