GNSS连续站在天津地面沉降监测中的应用

摘要

The difficulties and uncertainties caused by reference datum changes in land subsidence estimation are discussed. In order to solve the difficulty, the method in which the velocity datum is determined by the observed elevation variations time series combined with the repeated leveling data at several GNSS stations is presented. Some practical examples are given for the comparison between this method and the traditional one,it is proved that the new method has some advantages. On the basis of these results, some recommendations about the land subsidence monitoring and the evaluation method in the Tianjin area are proposed. These recommendations may have some helps for land subsidence monitoring and evaluation in other similar areas.%讨论单纯利用水准测量方法进行地面沉降监测时,由于基准点的变动造成地面沉降监测结果的不确定问题,提出用CORS站时间序列得到的高程分量变化速率与复测水准资料联合处理结果作为水准变化的速率基准,并利用实例与传统做法进行了比较,验证了该方法的优点.