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Revision to the Algorithms of Lowest Normal Low Water
Pages: 11-14
Year: Issue:  4
Journal: Hydrographic Surveying and Charting

Keyword:  chart datumlowest normal low waterlowest astronomical tidespecifications for hydrographic surveyrevision to algorithm;
Abstract: Based on some researches,the algorithms of the correction of long period tides and shallow water tides to Lowest Normal Low Water (LNLW) are revised.Detailed comparison of revised algorithms with Lowest Astronomical Tide (LAT) at 86 tide stations along the China seas is made.The results show that:(1) the differences are mostly less than 2 cm.(2) the algorithm of the correction of shallow water tides can't get the lowest water level at some river-mouth stations,where the amplitudes of shallow water tides are great.And at these stations,LNLW should be contrasted with LAT.At last,the influence of the number of tide constituents on LNLW is analyzed.It is shown that more tide constituents are used,but the lowest water level is not lower.13 major tide constituents are appropriate to calculate lowest water level.
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