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  • 1
    Call number: ZSP-403-293
    In: Jare Data Reports
    Type of Medium: Series available for loan
    Pages: 59 S. : überw. graph. Darst.
    Series Statement: JARE data reports 293 : Oceanography 28
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
    Publication Date: 2022-04-07
    Description: The tidal current harmonic constants in Ise Bay are owned by the Japan Coast Guard Hydrographic and Oceanographic Department and is a point-like one created by continuous day and night observation of tidal currents at fixed points. There is a grid-like one created in 2004 based on joint reserch with the Japan Hydrographic Association (2004, 2005a, 2005b). This time, as part of the research to create tidal current grid data, tidal current harmonic constants were created from the current direction and current velocity data observed by the Ise Bay Ocean Short Wave Radar operated by the Nagoya Port and Airport Technical Research Office, Chubu Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism. We examined these tidal current harmonic constants.
    Description: Published
    Description: Refereed
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.74-95
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  • 3
    Publication Date: 2022-04-07
    Description: The Japan Coast Guard Hydrographic and Oceanographic Department has provided data on tidal current, which is one of the ocean currents, as area information (tidal current grid data). In recent years, technologies related to the ocean have advanced, and new information such as detailed water depth data has been acquired. In addition, the mainstream method of providing tidal current grid data is digital, which has a high variety of information usages from printed matter. The Hydrographic and Oceanographic Department is conducting research to create new tidal current grid data corresponding to these. Between 2019 and 2020, the Akashi Strait was examined as part of first trial at creating tidal current grid data.
    Description: Published
    Description: Refereed
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.96-112
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  • 4
    Publication Date: 2021-05-19
    Description: By using the results of the simulations of tides and tsunamis in the Seto Inland Sea, we estimate the maximum current speeds induced by both tides and tsunamis around about 250 caldrons, of which formation processes were considered by Yashima (1994). Estimating a correlation between maximum current speeds and the depths of the caldrons, we examine the contributions of the currents induced by tides and tsunamis to the formations of caldrons in the Seto Inland Sea. The following results are obtained. 1) Concerning the caldrons laying in the center of the straits, a comparatively high correlation is found between maximum tidal currents and the depths of caldrons. This supports Yashima (1994), which concluded most of caldrons in the Seto Inland Sea were created by tidal erosion. 2) We find that the secondary undulations are generated by the resonance of tsunamis in some areas in the Seto Inland Sea, and strong currents occurred around the nodes of the undulations, which are usually formed at the mouths of small bays. It is high likely that the caldrons at these points were created by the strong currents of tsunamis. 3) The currents induced by both tides and tsunamis are weak around the caldrons located off the capes.
    Description: Published
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: pp.11-26
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  • 5
    Publication Date: 2021-05-19
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.61-68
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  • 6
    Publication Date: 2021-05-19
    Description: Sea current information is used in a variety of fields, including navigation safety, marine economic activities, marine environment conservation, and marine leisure. The Japan Coast Guard’s Hydrographic and Oceanographic Department conducts observations in Sagami Bay using ocean shortwave radar, and discloses and provides flow information on its website. The current information of Sagami Bay is for the past current based on the actual situation, and there is no information on the current conditions in the future. Future current information is helpful for marine activities. For example, ship operators can use it to plan safe and economical operations, while marine leisure people can use it to know the current time suitable for fishing. In addition, it is indispensable for the Japan Coast Guard to predict drifting in order to rescue drifters due to maritime accidents. This report describes a study for creating future flow information in Sagami Bay using data observed by ocean shortwave radar. It shows that the current condition in Sagami Bay also has tidal components, but components other than tidal currents are dominant. A method of estimating components other than the tidal current using moving averages and predicting them from past ocean shortwave radar data was studied. As a result, it was possible to forecast that components other than tidal current could be used practically.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.135-155
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  • 7
    Publication Date: 2021-05-19
    Description: This report summarizes the results of a sea-bottom survey in the eastern Sagami Trough to the triple junction of plates by the survey vessel "TAKUYO" on May and June, 1984. The survey, using a multi narrow beam echo sounder (SEA BEAM), revealed that a meandering deep canyon, the Boso Canyon (BOC), exists along the north border of the Sagami Trough. Up to this time, the canyon had been thought to be composed of echelon depressions. The BOC is a part of a long canyon with a length of more than 300 kilometers (from Sagami Bay to the Izu-Ogasawara Trench). As the longitudinal profile of the bottom of the BOC shows no undulation, it suggests that the BOC is a transporting route of sediments gathered from a wide back area. Another submarine canyon, the Awa Canyon (AWC), runs along the southern border of the Sagami Trough, parallel to the BOC. Its topography is in great contrast to the BOC. For instance, the AWC is a shallow valley with a gentle slope and is shallower than 4,500 meters (a singular canyon making small depressions of greater than 4,500 meters). It is worth noting that the bottom of the Sagami Trough is the AWC in the shallower part, and it transfers to the BOC in the deeper parts. Considering the topographical features and the seismic profiles, the material boundary of plates in the eastern Sagami Trough seems to be along the bottom of trough (as mentioned). At the triple junction, three topographic belts parallel to the direction of the Izu-Ogasawara Trench, (wide trench floors, inner highs and small basins) are recognized.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-24
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  • 8
    Publication Date: 2021-05-19
    Description: In order to observe ocean currents by the electromagnetic log with dual- axis sensors (EM 2 Log) equipped on patrol vessels in 11th Regional Coast Guard, we have changed method of collecting EM 2 Log data for better and performed two- direction observations for calculation of correction value from 2009. And we investigated availability of correction value calculated from the data measured in the search of the sea accident.
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 127-131
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  • 9
    Publication Date: 2021-05-19
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.31-42
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  • 10
    Publication Date: 2021-05-19
    Description: The Hydrographic Department has been operating 28 tide stations for long years. Except 9 tide stations where are under the influence of the KUROSIO for the sea level or still short period of observation, Mean Sea Level, Statistical heights of tide, etc. during 27 years for 19 tide stations are reported. From the study, (1) Periodical variation about 20 years on Mean Sea Level seems to exist. In order to recognize the existence, at least more 40-60 years observation are necessary. (2) Non”harmonic constants (HWL, LWL, etc.) values are led by one year observation are able to use for the civil engineering. (3) From the variation of Mean Sea Level in long period, upheaval or subsidence of land are estimated about 0.3 -0.7 cm/ year at various station. (4) Amplitude, Phase lag of four main principal Harmonic constants are obtained stable values from one year observation, which are confirmed by results of every 19 years analyzing of tidal data. (5) The lowest tide level of every year are minus figure which reach to 30~ 50 cm below the Datum level. In order to provide safety depths on nautical charts according to IHB resolution, the method of determination of Z0 value in Japan is recommended to change as follows: Hm+Hs+H'十 Ho十Hsa十 Hn十H"or Lowest Astronomical Tide (LAT)
    Description: Published
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.175-189
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