GNSS验潮在海上石油物探测量中的应用探讨

结合GNSS测高原理,探讨海面实时高程的测量方法即GNSS验潮,为石油物探施工中使用GNSS验潮数据替代现有的潮汐表数据实现石油物探物理点高程的测量,并从测量精度与实际应用方面进行分析总结,给出GNSS验潮在实际施工中的应用方法与步骤,供广大同行参考。

采用GNSS动态定位获取近海高精度潮位

基于青岛附近黄海海域的GNSS验潮观测数据,利用GAMIT TRACK双差动态定位模块,解算潮位变化。引入IGS组织发布的最终星历参与计算,获取GNSS高精度验潮,将结果与压力式验潮仪的观测值进行比对。采用QDCORS站和上海IGS连续跟踪站的数据分别与流动站组成6类不同长度的基线组合,验证模块的作用距离,使得结果具有更广的适用性。

多波束无验潮测深技术在葛洲坝枢纽中的应用

本文介绍了多波束GNSS无验潮水下地形测量的原理。以葛洲坝水利枢纽工程测量为例,对多波束无验潮方法获取的水深测量结果进行了成果精度分析。结果表明,多波束无验潮测深技术测量数据真实可靠,精度有保证,在实际应用中具有准确性、有效性和可行性。

水下地形测量方法探讨

目前,水下地形测量主要基于GPS进行,对海洋环境下的PPK和PPP解算精度和稳定性的验证工作较少。以江苏近海海域为研究区,通过在研究区域布设临时验潮站,开展不同验潮模式和无验潮模式情形下水下地形测量,对获得的数据对比分析,基于数据较差情况,分析不同模式下水下地形测量的适用性。结果表明:可为后期水下地形测量提供可行性技术支撑,在不同区域水下地形测量方法的选取上不但可以提高外业工作效率和数据可靠性,而且能大大节约生产成本和缩短项目作业工期。

Land vertical movement analysis of China coastal tidal stations and adjacent areas

The paper analyzes the characteristics of the vertical movement of the land in the coastal areas of China and its neighboring areas by using the GNSS observation data of the tide gauge at coastal stations of China and the land-based network GNSS reference stations in the neighboring areas,combined with the satellite altimeter and the sea-level observation data of the stations.The results show that the vertical movement of the land in China's coastal provinces and municipalities and coastal tide gauge stations is generally ascending from Liaoning to Jiangsu Province and subsiding from Shanghai to Quanzhou,Xiamen to Guangxi Autonomous Region coastal alternate pattern of elevation,local coastal plain areas such as southern Tianjin in the North China Plain,and Cang County in the Hebei Plain show significant subsidence characteristics.The uplift and subsidence of land at tide gauge stations is an important part of the relative sea level changes along the coast.The accurate characteristics of the vertical movement of land at tide gauge stations and its adjacent areas provides basis for analysis of relative sea level changes along the coast,assessment of sea level change impact and future sea level rise forecast.