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Research on Indian Spring Low Water Ratio Datum Computation Method
Pages: 30-33
Year: Issue:  5
Journal: Hydrographic Surveying and Charting

Keyword:  chart datumtransfer methodIndian Spring Low Wateraccuracy of transferringsynchronous time length;
Abstract: Spatial distribution of the ratio of Indian Spring Low Water (ISLW) to Lowest Normal Low Water (LNLW),calculated by tide model,is analyzed.The contour shows complex distribution over China Seas.So the applicability of the ISLW ratio method can't be judged by the distance or the type of tide.Based on three pairs of tidal stations,the accuracy of transferring in different synchronous time length is assessed.When the synchronous time length is longer than 7 days,the variations of the error are in 15cm.Systematic error may be exist according to the applicability of the ISLW ratio method.Contour of the ratio ISLW to LNLW is given as the reference for the applicability judgment.
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