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Date
2021
Metadatos
Mostrar el registro completo del ítemAbstract
In this study, we proposed criterion for the “same” tidal variation as a means of determining the acceptable range of the water depth error based on the water level reduction. The proposed criterion is 9 cm of the standard deviation of the difference between the observed tidal levels and the tidal levels in the survey area. In order to investigate the geospatial coverage where the criterion is acceptable, the standard deviation of the tidal level difference from 2013 to 2017 using the tide gauge data from the Japan Oceanographic Data Center was calculated. In most areas along the coast of the Japan Sea from Susa to Wakkanai, the standard deviation of the difference of the tidal level between the two adjacent tide gauges is less than 9 cm. However, this does not apply to the Tsugaru Strait and the Pacific Ocean from Shibushi to Hanasaki or the area where the Kurosio gets closer to the coast, or when the difference of the astronomical tide is large. This criterion can be interpreted as being within the permissible range of the water depth required for the Special Order of hydrographic surveys. In these areas, data from the reliable permanent tide gauge nearest to the survey area, instead of a temporary tidal observation just in front of the survey area, should be used for water level reduction.Journal
Report of Hydrographic and Oceanographic ResearchesIssue/Article Nr
59Page Range
pp.190-203