大村湾および佐世保湾の調和分解による潮位について

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  • オオムラワン オヨビ サセボワン ノ チョウワ ブンカイ ニヨル チョウイ ニ
  • On the Tidal Amplitude by the Harmonic Analyses of the Tides in Omura Bay and Sasebo Bay

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An investigation was made on the present situation of tides in Omura Bay and Sasebo Bay, which are situated in Nagasaki Pref. and take typically blockaded forms. The purpose of the investgation was to forecast the changes of tides and contamination of seawater by development works. As a part of the investgation, the authors, in order to analyze the flowing condition of seawater, observed the tide range and tidal current in both bays. They present in this paper the results of the harmonic analyses of tides. The amplitude and the phase of semi-diurnal tide in Omura Bay showed almost the same value at each station, although at the bay bottom the amplitude shows an increasing tendency. Because of its complicated topography, Sasebo Bay, which is a small area, shows a different value of amplitude according to the kind of component tide and the location of the station. And the phase of the same component tide in the Bay tends to advance or lose at different stations. It is necessary, therfore, not only to make a long-term observation but also to install several stations in similar bay. Because Inoura Strait connecting the two bays is very narrow and has a lot of bends, in Omura Bay the amplitude of lunar semi-diurnal component tide decreases about two-thirds and the phase loses about three hours in comparison with those in Sasebo Bay.

長崎大学水産学部研究報告, v.47, pp.67-73; 1979

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