Wide area coastal subsidence monitoring and driver analysis with multi tracks of TS-InSAR—a case study of Shandong province

doi:10.11947/j.AGCS.2025.20250061

Abstract

Abstract:

Coastal subsidence will exacerbate relative sea level rise and increase the risk of flood-related coastal infrastructure inundation and soil salinization. As a major economic province in the east coast of China, the coastline of Shandong accounts for about 1/6 of the country. However, the spatiotemporal evolution characteristics and key drivers of land subsidence in Shandong are still unclear. In this paper, we conducted multi-track radar interferometry (InSAR) time series analysis with the Sentinel-1 imagery from 2019 to 2022. Firstly, we proposed a multi-track InSAR uncontrolled splice method applicable to the interface region between land and sea to correct the systematic bias of interferograms from adjacent tracks. Then, we generated a large-scale land subsidence rate map of the whole province with good consistency. Furthermore, we found multiple sinking funnels over 50 mm/a. Based on Sentinel-2 multispectral remote sensing images, deformation time series and principal component analysis, we revealed the spatiotemporal change of the heterogeneous sedimentation funnel and its drivers. The results show that human activities related to groundwater pumping and coal mining are the main factors causing land subsidence in Shandong province. This study is expected to provide technical support and scientific basis for large-scale coastal subsidence monitoring and risk management, and further improve the understanding of coastal geological disaster risk.

Key words: coastal subsidence, time-series InSAR, multi-track splicing, Sentinel-1, Sentinel-2, principal component analysis, driving factor, human activities

CLC Number:

P228

Peng LI, Jianbo BAI, Zhenhong LI, Houjie WANG. Wide area coastal subsidence monitoring and driver analysis with multi tracks of TS-InSAR—a case study of Shandong province[J]. Acta Geodaetica et Cartographica Sinica, 2025, 54(7): 1178-1191.

Figures/Tables 16

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轨道方向	轨道号	图幅号	影像数量	时间跨度	入射角/（°）
升轨	40	112	120	2019-01-03—2022-12-13	41.61
	40	107	120	2019-01-03—2022-12-13	41.64
	142	121	119	2019-01-10—2022-12-20	41.57
		116	119	2019-01-10—2022-12-20	39.52
		111	118	2019-01-10—2022-12-20	39.56
		106	114	2019-02-03—2022-12-20	41.64
	69	119	103	2019-01-05—2022-12-27	39.51
		114	104	2019-01-05—2022-12-27	39.58
		109	104	2019-01-05—2022-12-27	39.57
	171	121	105	2019-01-12—2022-12-22	41.57
		116	112	2019-01-12—2022-12-22	39.53
		111	112	2019-01-12—2022-12-22	36.91
	98	119	116	2019-01-07—2022-12-29	36.92
	98	113	119	2019-01-07—2022-12-29	36.92
降轨	76	478	79	2019-02-16—2021-12-14	39.70
降轨	76	468	79	2019-02-16—2021-12-14	39.64

子图编号	影像信息	改正值/（mm/a）	子图编号	影像信息	改正值/（mm/a）
a	P40F112	0.92	h	P69F114	3.76
b	P40F107	－2.08	i	P69F109	1.04
c	P142F121	4.36	j	P171F121	－1.86
d	P142F116	3.21	k	P171F116	－3.11
e	P142F111	2.38	l	P171F111	－3.22
f	P142F106	2.95	m	P98F119	－3.89
g	P69F119	－0.93	n	P98F113	－3.54