Surface Current Analysis of Marine Meteorological Data Observed at Mooring Buoy Station off Joga-Shima Island in Sagami Bay

Marine meteorological data observed at mooring buoy system off Joga-shima island in Sagami Bay were analyzed by BA YTAP-G program to obtain the tidal current harmonic constants and drift current induced by wind. The data were sampled every hour for the period from Jan. 1 to Dec. 31, in 1997. The observed current vector were analyzed in combination with wind vector. Through the above analysis, it has become clear that the wind effect enhances the diurnal components as much as 2 factor for the tidal current harmonic constants, which may arise from the sea land breeze system predominant in Sagami Bay. The response coefficients of drift current correlated with discrete wind velocities were obtained for several cases by changing lag parameters. Through this analysis, it became clear that the general pattern of drift current was consistent with Ekman spiral system. The present study also made apparent the origin of the sudden enhancement of coastal current velocity (overfalls) in the Sagami Bay. One origin is the approach of Kuroshio branch into the Sagami Bay as already pointed out by several authors, and the other is the augmentation of the tidal current amplitude. The latter phenomenon is newly found and it may be triggered by the approach of the Kuroshio branch to the coastal region.

Bibliographic Details

Main Authors:	Ueda, Yoshio, Mine, Masayuki, Nakata, Naohiro, Shimizu, Kentaro
Format:	Journal Contribution biblioteca
Language:	Japanese
Published:	2000
Online Access:	http://hdl.handle.net/1834/15751
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