| 一个确定海图基面的方法 |
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| 引用本文： | 徐汉兴.一个确定海图基面的方法[J].海洋科学,1990,14(5):8-11. |
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| 作者姓名： | 徐汉兴 |
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| 作者单位： | 上海航道局设计研究所 |
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| 摘 要： |
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| 关 键 词： | 海图 基面 海面 确定 |
| 收稿时间： | 2/8/1989 12:00:00 AM |
TECHNIQUES FOR DETERMINATION OF THE CHART DATUMS |
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| Xu Hanxing.TECHNIQUES FOR DETERMINATION OF THE CHART DATUMS[J].Marine Sciences,1990,14(5):8-11. |
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| Authors: | Xu Hanxing |
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| Institution: | The Design and Research Institute of Shanghai Warerway Bureau |
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| Abstract: | This paper presents a synthetic computational method which can produce satisfactory Theoretical Depth Datum (TDD) for Jiuzhou Port in Pearl River Estuary, by directly using the data on harmonic constants and relative topographical charts of the observation stations near the port where the observed tidal data are lacking.In computation, the harmonic constant of each corresponding tidal constituents for Jiuzhou Station are first obtained by means of "Geographical Interpolation Method" on the basis of the harmonic constants and topographic conditions at Xiangzhou and Dongaodao Islands Stations. Then the formula of "Indian Spring Low Water" is adopted to compute" Nearly Lowest Low Water" for the above three stations, as the characteristics of the diurnal constituents is notable in this sea area. With knowledge of the relations between TDD and Mean Sea Level at Xiangzhou and Dongaodao Islands Stations, "Nearly Lowest Low Water" for Jiuzhou is then corrected to work out "Approximate Lowest Low Tidal Level", which is regarded as an important collateral evidence to determine the TDD for Jiuzhou Harbour. Meanwhile, the "Theoretical Possible Lowest Low Water" for Jiuzhou Station is obtained through the computation of the two combination of 8 and 11 tidal constituents. Finally, the all-computed characteristic lowest low tidal levels are compared; thus TDD for Jiuzhou is determined to be a reasonable value below the Mean Sea Level.This method is expected to be valid for ports similar to Jiuzhou. |
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| Keywords: | Mean sea level Nearly lowest low water Theoretical depth datum |
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