河南地矿CORS省域地面沉降监测与机理分析

Ground settlement monitoring and mechanism analysis of Henan geological mining CORS

为了进一步研究省域尺度范围地面沉降,分析河南地矿CORS省域地面沉降的监测方法与其形成机理:针对河南省地面沉降分布特征,采用河南省地质信息连续采集运行系统(HNGICS)的62个基准站数据,时间序列为2012—2019年,获得国际地球参考框架下无净旋转条件的河南省三维速度场;然后分解三维速度场获得河南垂直速度场,发现河南省地面沉降呈现“西稳东沉”的现象,开封附近出现沉降漏斗;最后将河南省地质图、河南省耕地面积占比、河南省年均降雨量与沉降等值线对比分析。结果表明:不同地质条件下,河南省地面沉降分布于豫东地区的第四系冲积层,而相同地质条件下,耕地占比和区域年均降雨量是地表差异性沉降的主要原因,如豫东地区耕地约占总面积的70%,地下水用于农业灌溉是豫东平原出现沉降漏斗的主要原因。

In order to further study the ground subsidence at provincial scale,the paper analyzed the monitoring method and formation mechanism of the ground subsidence in Henan geological mining CORS:according to the distribution characteristics of ground settlement in Henan Province,observation data from 62 reference stations of Henan geology information continuously collecting and operating system(HNGICS)with time series from 2012 to 2019 were used to obtain the three-dimensional velocity field of Henan Province without net rotation conditions under the framework of international terrestrial reference frame(ITRF);then,through the decomposition of the 3D velocity field,the vertical velocity field of each city in Henan Province was obtained,and it was found that the ground settlement in Henan Province presented a west-stable east-sinking phenomenon,with a subsidence funnel near Kaifeng;finally,the geological map,the proportion of arable land area and the average annual rainfall of Henan Province were compared with the subsidence contours.Results showed that under different geological conditions,the ground settlement in Henan Province could be mostly distributed in the Quaternary alluvium in the eastern part of Henan Province,while,under the same geological conditions,the proportion of arable land and the average annual rainfall of the region could be the main factors for the differential surface subsidence,for example,the arable land in the eastern part of Henan Province would account for about 70%of the total area,and the use of groundwater for agricultural irrigation could be the main reason for the subsidence funnel in the eastern Henan Plain.