한국 서해안 안면도 주변 천수만에서의 해수유동 특성

Abstract

In order to elucidate the movement of the seawater inside of Chunsu Bay around Anmyeondo located in the western sea of Korea, field observations for tides and currents and numerical experiments have been conducted. The amplitude of partial tide N2 was larger than those of O1 or K1 by approximately 15～17cm or 4～9cm, respectively. Thus, it proved that it was one of the major components of the tide. The major direction of the tidal currents at station C1, which is located in the south mouth of Chunsu Bay, was south-northward, and the velocities in their strongest flood and ebb flows were 130.0cm/s and 59.4cm/s, respectively. On the contrary, the major direction of the tidal currents at station C2, which is located in the north of the bay, was east-westward, and the velocities in their strongest flood and ebb flows were 87.7cm/s and 51.3cm/s. Also, the major direction of the tidal currents at station C3, located in the north tip of Anmyeondo, was northwest～southeastward, and the surface velocities in their strongest flood and ebb flows were 60.8cm/s and 45.9cm/s. Consequently, when at flood tide, tidal currents appeared to come in through the south mouth of the bay and go out through the Baekseosuro, locatied in the north tip of Anmyeondo. However, when at ebb tide, tidal currents turned their directions completely opposite. For tidal currents in Chunsu Bay created by a numerical model, the flood flows were generally prevalent than ebb flows and also revealed the strong south-northward reverse flows. For tidal residual currents, the northward flow was prevailed in the west of Anmyeondo but the southward flow in the north of Chunsu Bay, respectively whereas very fast and complicated circulations appeared near the south mouth of the bay because of many islands. Furthermore, in the Baekseosuro located in the north tip of Anmyeondo, the westward flows appeared induced by the difference of water level between the high and low waters.