本文選題：OTL + 建模　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：海潮周期性運(yùn)動引起海水質(zhì)量的重新分布,固體地球?qū)Υ怂a(chǎn)生的彈性響應(yīng)稱為海潮負(fù)荷效應(yīng)(Ocean Tidal Loading,簡稱OTL)。OTL位移效應(yīng)是高精度大地測量中必須加以考慮的因素。獲得OTL位移的方法包括建模法,GPS技術(shù)精密測定等。研究表明,目前沿海區(qū)域OTL位移建模還存在較大差異,因此本文以臺灣區(qū)域?yàn)槔治鲇刹煌３蹦Ｐ秃偷厍蚰Ｐ鸵鸬腛TL位移建模差異及OTL位移建模精度。為研究臺灣區(qū)域由于使用不同海潮模型和地球模型對OTL位移建模的影響,本文采用4種全球海潮模型(EOT11a、Fes2004、GOT和TPX072atlas)和4種地球模型(PREM、IASP91、AK135和1066A)建模OTL位移,重點(diǎn)分析M2、01潮波的模型矢量差—結(jié)果表明:不同模型之間的OTL位移建模矢量差具有區(qū)域一致性。臺灣區(qū)域OTL位移建模對于地球模型較為敏感,地球模型差異導(dǎo)致的M2潮波東西方向矢量差達(dá)到0.89mm,南北方向達(dá)到0.56mm,并且水平方向大于垂直方向。本文同時(shí)使用了近海潮汐模型NA099Jb對上述4種全球海潮模型進(jìn)行修正,而矢量差結(jié)果并無較大變化。利用GPS觀測資料精密測定的OTL位移參數(shù),通過均方根誤差來評定該區(qū)域不同模型的OTL位移建模精度,并進(jìn)一步分析影響該區(qū)域OTL位移建模的因素。以M2、01潮波為例,OTL建模值與GPS測定值之間的均方根誤差結(jié)果表明:基于全球海潮模型EOT11a和地球模型PREM的OTL建模值與GPS測定值最為接近,但仍存在誤差,M2潮波水平方向均方根誤差約為0.5mm,而垂直方向可達(dá)1.5mm。這說明該區(qū)域OTL建模精度不高且主要誤差來源于地球模型,臺灣區(qū)域的地球模型精度有待提高。結(jié)果也表明,利用GPS技術(shù)精密測定OTL位移可以為研究臺灣區(qū)域的地殼及上地幔結(jié)構(gòu)提供約束。
[Abstract]:The elastic response of the solid earth to the ocean tide load effect is called Ocean Tidal loading effect, which is called ocean Tidal loading effect. OTLN. OTL displacement effect is a factor that must be considered in high precision geodesy. The methods of obtaining OTL displacement include modeling method and GPS precise measurement. The research shows that there are still great differences in OTL displacement modeling in coastal areas at present, so this paper takes Taiwan as an example to analyze the difference of OTL displacement modeling caused by different tidal and earth models and the accuracy of OTL displacement modeling. In order to study the influence of different tidal models and Earth models on OTL displacement modeling in Taiwan region, OTL displacements are modeled by four global tidal models, EOT11aFes2004, got and TPX072atlasand four Earth models, PREMN PIAS91AK-135 and 1066A). The model vector difference of M2Q01 tidal wave is analyzed emphatically. The results show that the OTL displacement modeling vector difference between different models has regional consistency. The OTL displacement modeling in Taiwan region is sensitive to the Earth model. Due to the difference of the earth model, the east-west vector difference of M2 tidal wave is 0.89 mm, the north-south direction is 0.56 mm, and the horizontal direction is larger than the vertical direction. In this paper, we also use the offshore tidal model NA099Jb to modify the above four global tidal models, but the result of vector difference has not changed greatly. Based on the precision OTL displacement parameters measured by GPS data, the OTL displacement modeling accuracy of different models in this region is evaluated by the root mean square error, and the factors affecting the OTL displacement modeling in this region are further analyzed. The root-mean-square error between the modeling value of OTL and the measured value of GPS shows that the modeling value of OTL based on the global tidal model EOT11a and the Earth model PREM is the closest to the GPS value. However, there is still an error of about 0.5 mm in the horizontal direction of M2 tidal wave, and 1.5 mm in the vertical direction. This indicates that the precision of OTL modeling in this region is not high and the main error comes from the Earth model, and the precision of the Earth model in Taiwan needs to be improved. The results also show that the precise measurement of OTL displacement by GPS technique can provide constraints for the study of the crustal and upper mantle structures in the Taiwan region.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P228.4

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本文編號：1982350