臺灣海潮負載效應於測量改正計算之研究

The study of ocean tide loading corrections in Taiwan

黃鉅富(Jiu-Fu Huang)

《國土測繪與空間資訊》 6卷1期 (2018/01) Pp. 15-29

摘要

臺灣海潮負載(OTL)效應之數值推估重力模式SGOTL(Hwang and Huang, 2012)、位移模式DISOTL(Hwang and Huang, 2013)已分別開發完成，並對外發表網頁，提供各界進行OTL 效應改正線上計算服務，特別是對於海潮變化較大的近岸測站，利用該模式改正後之觀測成果，精度確實獲得改善。由於臺灣海峽週邊海潮效應明顯，分析馬祖GPS 站之徑向各分潮振幅合量最高可達5.5 cm；新竹超導重力站之各分潮振幅合量約有11 μgal，對於高精度測量產生不小影響，有改正必要。本文除發表內政部公告219 個一等衛星控制點(GPS 連續觀測站)之OTL 計算服務外，也進行OTL 對於精密單點定位(Precise point positioning, PPP)技術計算成果影響與改正之研究。

關鍵字

DISOTL ； SGOTL ； 重力測量 ； 海潮負載 ； 精密單點定位 ； 衛星定位

並列摘要

A numerical model to compute SGOTL (gravity) (Hwang and Huang, 2012) and DISOTL (displacement) (Hwang and Huang, 2013) resulting from ocean tide loading (OTL) had been successfully developed, and online computation service was released, especially for coastal stations with large ocean tides. By use of this mode, the accuracy of observation is indeed improved. Around the Taiwan Strait, OTL-induced vertical displacement of Matsu GPS station can be up to 5.5 cm, and the gravity of Hsinchu superconducting gravity Station is about 11 μgal, where such large OTL effects will have a profound influence on the precise measurements. Ministry of the Interior (MOI) announces a new set of geodetic datum and TWD97 coordinates at 2010. In the study, online service of OTL computation at 219 first-order GPS continuous stations has been released and the accuracy of precise point positioning (PPP) derived coordinates affected and modeled by OTL were analyzed.

並列關鍵字

DISOTL ； Gravimetry ； Ocean tide loading ； Precise point positioning ； Satellite positioning ； SGOTL

參考文獻

Agnew, D. C.(2013).SPOTL: Some programs for ocean-tide loading.,::Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California.

Baker, T. F.,Bos, M. S.(2003).Validating Earth and ocean models using tidal gravity measurements.Geophysical Journal International.152(2),468-485.

Boy, J. P.,Llubes, M.,Ray, R.,Hinderer, J.,Florsch, N.,Rosat, S.,Lyard, F.,Letellier, T.(2004).Non-linear oceanic tides observed by superconducting gravimeters in Europe.Journal of Geodynamics.38,391-405.

Huang, J. F.(2012).High-resolution and height-dependent ocean tide loading effects on near-shore SG and GPS stations: models, validations and corrections for gravity and displacement.National Chiao Tung University.

Hwang, C.,Huang, J. F.(2012).SGOTL: A computer program for modeling high-resolution, height-dependent gravity effect of ocean tide loading.Terrestrial, Atmospheric & Oceanic Sciences.23(2),219-229.