Inferring decelerated land subsidence and groundwater storage dynamics in Tianjin–Langfang using Sentinel-1 InSAR  

作　　者：Xuguo Shi Tongtong Zhu Wei Tang Mi Jiang Houjun Jiang Chen Yang Wei Zhan Zutao Ming Shaocheng Zhang 

机构地区：[1]School of Geography and Information Engineering,China University of Geosciences,Wuhan,People’s Republic of China [2]College of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing,People’s Republic of China [3]School of Geospatial Engineering and Science,Sun Yat-Sen University,Guangzhou,People’s Republic of China [4]School of Civil Engineering,Anhui Jianzhu University,Hefei,People’s Republic of China [5]Institute of Karst Geology,CAGS/Key Laboratory of Karst Dynamics,MNR&GZAR,Guilin,People’s Republic of China [6]The First Monitoring and Application Center,China Earthquake Administration,Tianjin,People’s Republic of China

出　　处：《International Journal of Digital Earth》2022年第1期1526-1546,共21页国际数字地球学报（英文）

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.41702376,42001368 and 42174043).

摘　　要：To meet the growing demand for socioeconomic development,a large amount of groundwater is extracted from confined aquifers worldwide.The North China Plain has experienced considerable groundwater depletion and subsidence during the past six decades.In this study,we use Sentinel-1A/B SAR images from 2015 to 2020 to map the ground subsidence of the Tianjin–Langfang area.Three subsiding zones centered at Guangyang,Wuqing–Bazhou,and Jinghai are identified with maximum subsidence rates of 98.1,121.8,and 104.7 mm/yr.Seasonal and long-term signals are separated from time series subsidence and hydraulic measurements using continuous wavelet transform to retrieve aquifer parameters.The long-term subsidence,which fits well with an exponential decaying model,remarkably slows down in our study area.The elastic skeletal storage coefficients range between 0.52×10−3 and 9.66×10−3.We then retrieve the spatial–temporal variations of total groundwater storage,recoverable groundwater storage,and irreversible groundwater storage.Groundwater storage depletion rates are apparently reducing,which benefits from the operation of the South-to-North Water Transfer Project and local groundwater management practices.

关 键 词：North China Plain aquifer parameter South-to-North water transfer project groundwater storage SUBSIDENCE 

分 类 号：P345[天文地球—水文科学]