Issues related to the computation of the mean sea level for hydrographic surveys.
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Author
Sato, SatoshiDate
2020
Metadata
Show full item recordAbstract
The 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.Journal
Report of Hydrographic and Oceanographic ResearchesIssue/Article Nr
58Page Range
pp.100-108Resource/Dataset Location
https://www1.kaiho.mlit.go.jp/GIJUTSUKOKUSAI/KENKYU/report/article.html#rhr58