北京市沉降区CORS站高程基准变化分析

Analysis of elevation datum change of CORS station in Beijing subsidence area

根据北京市连续运行参考站(CORS)系统多年累积的连续观测数据,研究CORS站坐标高程基准的变化规律,利用北京市沉降区高程水准复测的高差结果验证其准确性,得出以下结论:CORS站垂直方向运动普遍存在明显的周期变化,虽然部分测站的两种高差结果相差较大,但全球卫星导航系统(GNSS)高差与水准高差的趋势项相似度极高,北京市采取严格限制地下水开采、北京市“海绵城市”绿地建设、南水北调的工程等措施从一定程度上缓解了北京市沉降的趋势,取得了一定的整治成果,以朝阳(CHAO)站、牛栏山(NLSH)站尤为明显,甚至出现了抬升的趋势。

According to the many years'continuous observation data by the continuously operating reference stations(CORS)system in Beijing,the variation law of the coordinate elevation datum of the CORS station has been researched,and the height difference results of the re-measurement of the elevation level in the subsidence area of Beijing were applied to verify its accuracy,then the following conclusions are drawn:there are obvious periodic changes in vertical motion on the CORS station.Although the results of the two height differences at some stations are quite different,the trend items of the global navigation satellite system(GNSS)height difference and the horizontal height difference are very similar.Measures such as the"sponge city"green space construction and the South-to-North Water Diversion project have alleviated the trend of Beijing's subsidence to a certain extent,and achieved certain renovation results,especially at CHAO Station and NLSH Station,and even a rising trend.