Investigating land subsidence and its causes along Beijing high-speed railway using multi-platform InSAR and a maximum entropy model

International Journal of Applied Earth Observations and Geoinformation

Huili Gong¹  Chaofan Zhou¹  Xiaojuan Li²  Yun Chen³  Yuan Si³  Mingliang Gao⁴  Yun Pan⁵  Kunchao Lei⁶  Beibei Chen⁶ 

[1] College of Resources Environment and Tourism, Capital Normal University, Beijing 100048, China;Corresponding author.;Observation and Research Station of Groundwater and Land Subsidence in Beijing-Tianjin-Hebei Plain, MNR, China;Beijing Institute of Hydrogeology and Engineering Geology, Beijing 100195, China;Commonwealth Scientific and Industrial Research Organization Land and Water, Canberra, ACT, Australia;Key Laboratory of the Ministry of Education Land Subsidence Mechanism and Prevention, Capital Normal University, Beijing 100048, China;

关键词: High Speed Railway;    Land subsidence;    Interferometric Synthetic Aperture Radar (InSAR);    Time series fusion method;    Maximum entropy model;   

DOI  :  

来源: DOAJ

【 摘 要 】

Beijing-Tianjin High Speed Railway is the first high-speed railway in China. The Beijing section of it runs through areas affected by subsidence which threaten its safe operation. This study develops a new time series fusion method based on the minimum gradient difference of a fitting curve to produce time series subsidence along this section. Through blending Envisat ASAR and TerrSAR-X time series, the InSAR-derived subsidence and its spatial–temporal development was analyzed along the railway. The relationship between subsidence and its causes was then explored using a maximum entropy model. The study reveals that: (1) The subsidence dynamics identified using the new fusion method agrees with the ground deformation measurements; (2) The sections of most severe subsidence occur between kilometer point KP 11 and KP 21; and (3) The main hydrogeological factors affecting subsidence are the compressible deposit thickness and the groundwater level in the second confined aquifer. The new fusion method proposed improves the accuracy and reliability of subsidence time series. It extends the time span of subsidence monitoring. The approach is mainly applicable to areas with significant vertical deformation, and is particularly suitable for integrating multi-platform data with overlapping in time or with a short time gap.

【 授权许可】

Unknown