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dc.contributor.authorSato, Satoshi
dc.date.accessioned2020-07-10T19:13:00Z
dc.date.available2020-07-10T19:13:00Z
dc.date.issued2020
dc.identifier.urihttp://hdl.handle.net/1834/17353
dc.description.abstractThe chart datum is defined as the value Zo under the mean sea level. The mean sea level is determined by the average of longterm sea level data. In the hydrographic survey in Japan, the mean sea level is usually deduced from the short term mean sea level during the survey, by comparing it with the mean sea level at the neighboring tide station of the same duration. It used to be thought that the seasonal variation of the sea level is removed by this computation, but little analysis has been done on the degree of error generated by this computational method. In this paper, it is shown that the errors for the estimation of the mean sea level based on this computational method, which compare the short-term mean sea level with the monthly mean sea levels of neighboring tide stations, are almost all within 0.10 m. This means that the errors are within an acceptable range. However, some problems exist in operation regarding to this estimation of the mean sea level. The biggest problem is that the mean sea level is sometimes computed by this method, even though there is a tide station at the sur vey site, which has been monitoring the sea level for a long time. Because this computational method has some error, the mean sea level should be determined only by the data of the tide station at that site.en_US
dc.language.isojaen_US
dc.relation.urihttps://www1.kaiho.mlit.go.jp/GIJUTSUKOKUSAI/KENKYU/report/article.html#rhr58en_US
dc.titleIssues related to the computation of the mean sea level for hydrographic surveys.en_US
dc.typeJournal Contributionen_US
dc.bibliographicCitation.issue58
dc.bibliographicCitation.titleReport of Hydrographic and Oceanographic Researchesen_US
dc.description.statusPublisheden_US
dc.format.pagerangepp.100-108en_US
dc.type.refereedRefereeden_US
refterms.dateFOA2021-01-30T18:48:37Z


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