Abstract
Coastal areas are usually densely populated, economically developed, ecologically dense, and subject to a phenomenon that is becoming increasingly serious, land subsidence. Land subsidence can accelerate the increase in relative sea level, lead to a series of potential hazards, and threaten the stability of the ecological environment and human lives. In this paper, we adopted two commonly used multi-temporal interferometric synthetic aperture radar (MTInSAR) techniques, Small baseline subset (SBAS) and Temporarily coherent point (TCP) InSAR, to monitor the land subsidence along the entire coastline of Guangdong Province. The long-wavelength L-band ALOS/PALSAR-1 dataset collected from 2007 to 2011 is used to generate the average deformation velocity and deformation time series. Linear subsidence rates over 150 mm/yr are observed in the Chaoshan Plain. The spatiotemporal characteristics are analyzed and then compared with land use and geology to infer potential causes of the land subsidence. The results show that (1) subsidence with notable rates (>20 mm/yr) mainly occurs in areas of aquaculture, followed by urban, agricultural, and forest areas, with percentages of 40.8%, 37.1%, 21.5%, and 0.6%, respectively; (2) subsidence is mainly concentrated in the compressible Holocene deposits, and clearly associated with the thickness of the deposits; and (3) groundwater exploitation for aquaculture and agricultural use outside city areas is probably the main cause of subsidence along these coastal areas.
Highlights
Guangdong Province is located on the South China Sea coast and has the longest coastline of any province in China, approximately 4300 km
As the majority of these measurements are focused on the PRD, deformation monitoring for the entire coastline of Guangdong Province is not available
A positive Correlation between Sedimentary Thickness and Subsidence We focused on a geological formation that is usually prone to natural hazards, namely, the HolWoceenfoecsuesreieds o(Qn4a), gtoeoilnovgeisctaigl afotermthaeticoonrrtehlaattioins uofsuthaellsye ptwroonefactotornsa.tAursaslhhoawznaridns,Fingaumreel1y, itnhe
Summary
Guangdong Province is located on the South China Sea coast and has the longest coastline of any province in China, approximately 4300 km Along this coastline, several large agglomerations (e.g., the Pearl River Delta (PRD) and Chao Shan Plain (CSP)), harbors (Zhujiang, Zhanjiang, and Shantou), and a wide range of aquaculture and agricultural areas are clustered, controlling the primary economic activity and ecological environment. To satisfy the needs of urban residents and export trade, an increasing amount of land is exploited through the expansion of aquaculture land use and reclamation of seashore Among these exploitations, large-scale freshwater aquaculture has made Guangdong Province one of the top three aquaculture areas in China [3], which has contributed to the increasing aquaculture export. Doing so can potentially contribute to more effective prevention and mitigation of disasters and protection of the ecosystem and economy
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