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Volume 14 (2002)
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Volume 14, Issue 1
Displaying 1-3 of 3 articles from this issue
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Articles
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Takeshi Kawano, Yasushi Takatsuki, Michio Aoyama2002 Volume 14 Issue 1 Pages 1_1-1_9
Published: 2002
Released on J-STAGE: March 22, 2012
JOURNAL FREE ACCESSThe comparison of batches of IAPSO standard seawater (SSW) is basic to high quality hydrographic studies. There are a lot of works for batch-to-batch differences of SSW and so-called "offset table" has been summarized up to P 140. To apply the "offset table" retrospectively means to accept tacitly the hypothesis that the batch-to-batch difference of SSW was not caused only by the aging effect but also, to a considerable extent, the reflection of the "initial offset". In order to figure out the cause of the "initial offset", we conducted the comparison of the conductivity of the defined KCl solutions made from the different high quality chemicals and found the lot and/or company dependency. This is a potential cause of "initial offset" between SSW batches.View full abstractDownload PDF (3238K) -
Noboru Matsuura, Takashi Sasaki, Satoshi Sato, Ryouichi Horii2002 Volume 14 Issue 1 Pages 1_11-1_17
Published: 2002
Released on J-STAGE: March 22, 2012
JOURNAL FREE ACCESSKanmon Strait, where more than seven hundreds ships pass in a day, is known as one of the most difficult straits for ship navigation in Japan. This strait is narrow and the maximum velocity of tidal current is faster than ten knots in some cases. So, those who are engaged in safety navigation of this strait request more accurate forecast of tidal current in the Kanmon Strait.
For this purpose, we created a new system to forecast more precisely the tidal current in the Kanmon Strait. The system is based upon a two-dimensional numerical simulation model of the whole Kanmon Strait. The goal of this system is to be able to consider the meteorological effect, which cannot be taken into account the conventional method based upon harmonic constituents, for the tidal current.
Calculated tidal currents were compared with observed ones. High reliability of the tidal current simulation was confirmed to some degree.
It is intended to open the result of the simulation on the Internet, so the system will have a visual presentaion function that displays tidal current vector or tidal curves on Internet browser at the PC.View full abstractDownload PDF (2330K) -
Yoichi Sugiyama, Akira Wada2002 Volume 14 Issue 1 Pages 1_19-1_26
Published: 2002
Released on J-STAGE: March 22, 2012
JOURNAL FREE ACCESSThe environmental water temperatures in Ise Bay are characterized by a few degrees higher in the nearshore area than in the offshore area. From the results of the field observation and the numerical experiment, we think that the phenomenon peculiar to Ise Bay can be explained as follows. In the innermost area of Ise Bay, the vertical structure of water temperature is of an overturned stratification, which is caused by the salt maintaining the density stratification against much fresh water supplied even in winter. In consequence, the estuary circulation is developed even in winter. The water of higher temperature and higher salt upwells from the lower layer in the innermost area of the bay and the higher temperature zone is formed. These phenomena are reinforced by the prominent northern or north-westerly wind in winter, and the higher temperature zone spreads in the innermost area of the bay.View full abstractDownload PDF (2965K)
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