여자만 서수도 해역의 조류 및 조석평균류 특성
Characteristics of tidal current and mean flow at the west channel of Yeoja Bay in the South Sea of Korea
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여자만 서수도 주변해역의 조류, 조석평균류, 지형성와류의 분포와 생성기구를 파악하였다. 조류는 창조시 북북서류, 낙조시 남남동류하는 전형적 왕복성으로 유속은 창조보다 낙조시 강하다. 동수도 주변은 창조시 북서, 낙조시 남동류로, 둔병도 주변에 지형성와류가 형성된다. 창조류는 서수도에서 나로도 동쪽 봇돌바다 외해수가, 동수도는 여수반도 남쪽 금오열도 주변 연안수가 여자만 내로 유입된다. 낙조류는 여자만내수가 서수도, 동수도로 분리되어 남하하고, 동수도를 통과한 조류는 여수반도 남쪽 금오열도를 거쳐 가막만 만내수와 만나 남해 외해로 흐른다. 낭도 남쪽은 조류유속이 약하고, 유향이 일정하지 않다. 적금도 북서 해역은 창, 낙조시 조류가 수렴, 발산한다. 조류타원은 서수도에서 강한 왕복성, 동수도는 약한 회전성 형태이다. 조석평균류는 서수도 북단에 반 시계와 시계방향, 남단에는 북단과 회전방향이 반대인 지형성와류가 존재하며, 이러한 와류는 협수로를 통과하는 조류의 육지해안 마찰로 인한 와도발생 때문이다.
Abstract
In order to understand the tidal current and mean flow at the west channel of Yeoja Bay in the South Sea of Korea, numerical model experiments and vorticity analysis were carried out. The currents flow north at flood and south at ebb respectively and have the reversing form in the west channel. Topographical eddies are found in the surroundings of Dunbyong Island in the east of the channel. The flood currents flow from the waters near Naro Islands through the west channel and the coastal waters near Geumo Islands through the east channel. The ebb currents from the Yeoja Bay flow out along the west and the east channels separately. The south of Nang Island have weak flows because the island is located in the rear of main tidal stream. Currents are converged at ebb and diverged at flood in the northwest of Jeokgum Island. Tidal current ellipses show reversing form in the west channel but a kind of rotational form in the east channel. As the results of tide induced mean flows, cyclonic and anticyclonic topographical eddies at the northern tip but eddies with opposite spin at the southern tip are found in the west channel of Yeoja Bay. The topographical eddies around the islands and narrow channels are created from the vorticity formed at the land shore by the friction between tidal currents and the west channel.
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