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ISSN : 1225-6692(Print)
ISSN : 2287-4518(Online)
Journal of the Korean earth science society Vol.34 No.3 pp.189-194
DOI : https://doi.org/10.5467/JKESS.2013.34.3.189

회전하는 수조에서 나타나는 순압성 소용돌이의 패턴과 트라이폴라 소용돌이의 구조적 회전

권혁민·오영록*·김태연
경기과학고등학교, 440-800, 경기도 수원시 장안구 수일로 135
회전하는 수조에서 나타나는 순압성 소용돌이의 패턴과 구조 회전에 대한 연구를 수행하였다. 소용돌이는 수면위에 접촉된 원판을 수조에 대해 상대적으로 회전시키는 방법을 통해 만들어졌다. 회전원판의 크기, 회전방향, 회전속력에 따라 트라이폴라 소용돌이, 삼각형 소용돌이, 사각형 소용돌이, 커다란 원형 소용돌이가 안정하게 나타났고, 모양이 계속 변하는 불안정한 소용돌이도 나타났다. 회전원판과 수조 벽 사이의 간격이 안정한 소용돌이의 패턴에 큰 영향을 주었고 불안정한 소용돌이는 원판이 시계방향으로 빠르게 회전할 때 주로 나타났는데, 그 원인은 원심력적 불안정성이었다. 한편, 트라이폴라 소용돌이에서 나타난 전체 패턴의 구조적 회전 각속도는 원판 가장자리의 선속도에 비례하였고, 고기압성 트라이폴라 소용돌이가 저기압성 보다 더 큰 구조 회전 각속도를 가졌다. 로스비 수와 구조회전의 관점에서 볼 때, 해양에서 발견된 트라이폴라 소용돌이와 본 실험에서 나타난 트라이폴라 소용돌이는 유사하였다.

Patterns of Barotropic Vortex in a Rotating Fluid and the Structural Rotation of Tripolar Vortex

*Corresponding author: lorasia72@gmail.com

Tel: +82 31 8014 1532

Fax: +82 31 253 2812
, Hyeok Min Kwon, Young Lok Oh*, and Tae Yeon Kim

Gyeonggi Science High School for the Gifted, Gyeonggi 440-800, Korea

Abstract

In this study, the patterns of barotropic vortices and their structural rotation were investigated through laboratoryexperiments. Both stable and unstable barotropic vortices were formed in a rotating water tank with a rotating circularplate depending on the diameter, direction, and speed of rotating circular plate. The patterns of stable vortices turned outto be tripolar, triangular, rectangular, and monopolar vortex. These vortex patterns were affected by the gap between thecircular plate and the wall of the water tank. Many unstable vortices were formed by anticyclonically and highly rotatingcircular plate. These results were caused by the centrifugal instability. The structural angular velocity of the tripolar vortexincreased with the tangential velocity of the circular plate. The anticyclonic tripolar vortex had higher structural angularvelocity than the cyclonic vortex. The tripolar vortex in the water tank was very similar with the real oceanic tripolarvortex from the view point of the Rossby number and the structural rotation.

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