Research on spatial-temporal patterns and influencing factors of land subsidence in the North China Plain

Authors: Xu Wang*, , Xiaojuan Li , Capital Normal University´╝îCollege of Resources, Environment and Tourism, Yun Pan , Capital Normal University´╝îCollege of Resources, Environment and Tourism
Topics: China, Environment, Remote Sensing
Keywords: InSAR,GRACE,land subsidence,Interbasin diversion
Session Type: Poster
Day: 4/12/2018
Start / End Time: 1:20 PM / 3:00 PM
Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor
Presentation File: No File Uploaded

In this paper, Spatial-Temporal patterns of annual land subsidence in whole North China Plain were derived from 2003 to 2010 with high spatial resolution based on the time-series InSAR technique. Spatial statistical analysis, profile analysis and wavelet analysis are used to explore the temporal and spatial evolution characteristics of ground subsidence and groundwater reserves changes in the North China Plain, Control of Regional active faults on Land Subsidence and Influence of Interbasin diversion on land subsidence. The results show that:1)Two land subsidence zone in the North China Plain were detected by InSAR technique, The land subsidence area in North China Plain has reached 36,000 km2 and the maximum annual land subsidence rate reached 135 mm/yr.2) The control of regional active faults on land subsidence leads to uneven land subsidence in some areas.3) Time series analysis of land subsidence and Groundwater reserves observed by the gravity recovery and climate experiment (grace) indicated regional groundwater excess exploitation is the major factors to influence the ground subsidence and The correlation coefficient of land subsidence and groundwater reserve in the North China plain was 0.93.4) Based on wavelet analysis, it is found that Interbasin diversion contributes to nonlinear deformation of land subsidence in some areas, When the water is more than one hundred million tons, ground subsidence occurred obvious nonlinear deformation

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