GRACE和GPS监测下的华北平原2002—2023年地表形变分析  

Analysis of surface vertical load deformation in the North China Plain from 2002 to 2023 using GRACE and GPS

作　　者：杨翼宇 李琼 谷延超 YANG Yiyu;LI Qiong;GU Yanchao(School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学土木工程与测绘学院,成都610500

出　　处：《测绘科学》2024年第11期9-21,共13页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41931074);西南石油大学“启航计划”项目(2021QHZ031)。

摘　　要：为实现华北平原地表垂向负荷形变的长期监测,以及分析长期时间序列趋势变化规律,采用GRACE时变重力场模型反演2002—2023年华北平原地表垂向负荷形变,并与11个GPS观测站数据进行了对比,分析了与地下水变化、降水和“南水北调”工程情况的关系。结果显示:均方根减少量均值为0.20,最大值为0.39;周年信号减少量均值为0.64,最大值为0.84。对比发现2016—2021年降水减少,但“南水北调”工程的补充使得形变抬升趋势变缓;2021年后地下水显著减少,地表抬升趋势显著。研究表明GRACE数据能够有效监测长期负荷形变,其长期趋势变化的主要因素是地下水变化,“南水北调”工程则减缓了地下水超采的影响,缓解了地表形变。To achieve long-term monitoring of vertical surface load deformation in the North China Plain and analyze trends in long-term time series,this study uses the GRACE time-varying gravity field model to invert vertical load deformation from 2002 to 2023.It compares these results with data from 11 GPS stations and examines relationships with groundwater changes,precipitation,and the“South-to-North Water Diversion”project.Results show an average root mean square reduction of 0.20 and a maximum of 0.39,with annual signal reductions averaging 0.64 and a maximum of 0.84.The comparison indicates that between 2016 and 2021,reduced precipitation was offset by the“South-to-North Water Diversion”project,which slowed the uplift trend;after 2021,significant groundwater reduction led to a notable increase in surface uplift.The study shows that GRACE data effectively monitors long-term load deformation,with groundwater changes being a primary factor and the“South-to-North Water Diversion”project mitigating groundwater over-extraction impacts and easing surface deformation.

关 键 词：GRACE GPS 地表垂向负荷形变 华北平原 时变重力场 

分 类 号：P228[天文地球—大地测量学与测量工程]