中国台湾区域海潮负荷位移建模及精度分析

发布时间：2018-06-05 14:45

本文选题：OTL + 建模　；参考：《西南交通大学》2017年硕士论文

【摘要】：海潮周期性运动引起海水质量的重新分布,固体地球对此所产生的弹性响应称为海潮负荷效应(Ocean Tidal Loading,简称OTL)。OTL位移效应是高精度大地测量中必须加以考虑的因素。获得OTL位移的方法包括建模法,GPS技术精密测定等。研究表明,目前沿海区域OTL位移建模还存在较大差异,因此本文以台湾区域为例分析由不同海潮模型和地球模型引起的OTL位移建模差异及OTL位移建模精度。为研究台湾区域由于使用不同海潮模型和地球模型对OTL位移建模的影响,本文采用4种全球海潮模型(EOT11a、Fes2004、GOT和TPX072atlas)和4种地球模型(PREM、IASP91、AK135和1066A)建模OTL位移,重点分析M2、01潮波的模型矢量差—结果表明:不同模型之间的OTL位移建模矢量差具有区域一致性。台湾区域OTL位移建模对于地球模型较为敏感,地球模型差异导致的M2潮波东西方向矢量差达到0.89mm,南北方向达到0.56mm,并且水平方向大于垂直方向。本文同时使用了近海潮汐模型NA099Jb对上述4种全球海潮模型进行修正,而矢量差结果并无较大变化。利用GPS观测资料精密测定的OTL位移参数,通过均方根误差来评定该区域不同模型的OTL位移建模精度,并进一步分析影响该区域OTL位移建模的因素。以M2、01潮波为例,OTL建模值与GPS测定值之间的均方根误差结果表明:基于全球海潮模型EOT11a和地球模型PREM的OTL建模值与GPS测定值最为接近,但仍存在误差,M2潮波水平方向均方根误差约为0.5mm,而垂直方向可达1.5mm。这说明该区域OTL建模精度不高且主要误差来源于地球模型,台湾区域的地球模型精度有待提高。结果也表明,利用GPS技术精密测定OTL位移可以为研究台湾区域的地壳及上地幔结构提供约束。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P228.4

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