以NAO99b潮位模式建立臺灣海域網格化潮位分區從事水深測量之潮高修正

Tide Correction Method during Depth Sounding by Using NAO99b Ocean Tide Model to Establish Tidal Grid Zones Surrounding Taiwan Maritime Space

蔡宗旻(Tsung-Min Tsai) ； 顏沛華(Pei-Hwa Yen) ； 莊文傑(Wen-Jye Juang) ； 謝東發(Tung-Fa Hsieh)

《測量工程》 52卷3&4期 (2010/12) Pp. 23-38

https://doi.org/10.29983/JSE.201012.0003

摘要

本研究以NAO99b全球潮汐模式進行臺灣周圍海域格網化之潮位預報，並以IOS調合分析方法依各網格點計算平均潮差(Mn)諸值以繪製等潮位線；另求取主導分潮之平均高潮間隙(MHWI)諸值繪製等潮時線，據此等潮位線及等潮時線之套疊建立臺灣網格化潮位分區(Tidal Zone)。利用潮位分區概念製作之等潮區圖可由鄰近潮位站所觀測之數值加入該潮汐分區之振幅改正係數及相位差加以推算水深測量作業期間之測區潮位值，可提升海域水深測量之精度。本研究另經桃、竹、苗外海GPS浮標實測結果顯示，其潮汐推估誤差均方根(RMS)值約在10~16cm之間，符合美國工兵署水深測量手冊海岸地區的潮位修正誤差範圍之規範要求。

關鍵字

NAO99b ； IOS ； 潮位預報 ； 等潮位 ； 等潮時 ； 等潮區圖

並列摘要

Ocean tide model NAO99b has been applied in this research to simulate offshore tide condition of each numerical grid point surrounding Taiwan maritime space. IOS model then performed harmonic analysis to calculate mean range of tide (Mn) and mean high water interval (MHWI) for drawing co-range lines and co-phase lines. Co-tidal chart can be obtained by overlapping these two lines and formed tidal grid zones with which can be potentially used for tide correction by using the tide amplitude ratio and tidal phase difference of the reference tidal station along the coast so as to improve the depth sounding accuracy. On-site test has been carried out with a GPS buoy located in between Taoyuan and Miaoli maritime space and result tides estimated RMS value of 10~16cm which conformed to U.S. Army Corps of Engineers tide correction standard.

並列關鍵字

NAO99b ； IOS ； Tides forecasting ； Co-range ； Co-phase lines ； Co-tidal chart