Fortnightly shifts of intrusion depth of oceanic water into Ise Bay |
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| Authors: | Email author" target="_blank">Akihide?KasaiEmail author Tateki?Fujiwara Takuma?Kimura Hirokatsu?Yamada |
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| Institution: | (1) Graduate school of Agriculture, Kyoto University, Oiwake, Kitashirakawa, Sakyo, 606-8502 Kyoto, Japan;(2) 4th Regional Coast Guard Headquarters, Irifune, Minato-ku, Nagoya, 455-8528 Aichi, Japan;(3) Fisheries Research Division, Mie Prefectural Science and Technology Promotion Centre, Hamashima, 517-0404 Shima Mie, Japan;(4) Present address: 11th Regional Coast Guard Headquarters, Minatomachi, 900-8547 Naha, Okinawa, Japan |
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| Abstract: | To clarify the time change in water exchanges between Ise Bay and the adjacent ocean, repeated hydrographic observations were
conducted along the longitudinal section in Ise Bay. The results show that the mixing condition at the bay mouth (Irago Strait)
changed fortnightly in summer. During the spring tides, the strait water below the pycnocline was well-mixed and nearly homogeneous.
By contrast, it was weakly stratified during the neap tide. There is a strong negative correlation between the tidal range
and the density difference between the upper and lower layers at the strait. In summer, the intrusion depth of oceanic water
into the bay and consequent hydrographic conditions inside the bay changed frequently according to the tidal strength. During
the spring tides a prominent bottom front was created at the bay mouth, indicating that the strait water, which is a mixture
of oceanic and bay waters, intruded through the middle layer. On the other hand, during the neaps, cold and saline oceanic
water intruded through the bottom layer into the bay. The intrusion depth is significantly correlated with the tidal range.
It is considered that the wellmixed strait water, which has a density equivalent to the middle layer inside the bay, is lighter
than the bottom bay water and thus intrudes through the middle layer during the spring tides, while insufficient mixing makes
the bottom water at the strait heavier than the bay water, leading to the bottom intrusion during the neap tides. |
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| Keywords: | Fortnightly shifts tide hydrographic condition intrusion ROFI estuarine circulation Ise Bay |
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