基于ALOS1/PALSAR的漳州沿海区域地表沉降监测

Land Subsidence Monitoring of Zhangzhou Coastal AreaBased on ALOS1/PALSAR

近十年来,漳州市沿海地区频繁发生地面沉降、塌陷等灾害,造成了巨大的经济损失和安全隐患,同时还会引发海水入侵以及土地盐碱化等环境问题。因此,快速及时监测沿海地区地表沉降信息对于保护沿海地区的安全具有重要意义。合成孔径雷达干涉测量技术(InSAR)具有大范围、高精度以及高空间分辨率等优势,逐渐成为地表沉降监测的有效手段。为此本文利用2007年7月至2011年3月的34景ALOS1/PALSAR影像,基于SBAS-InSAR技术获取了漳州沿海地区的平均沉降速率和累积形变量,并结合地质信息对研究区域的形变特征进行解译。结果表明,古雷半岛的古雷石化基地、漳江三角洲地区以及杜浔镇和沙西镇的南部地区在该时间段内的形变速率最大可达24 mm/a;此外,该地区地表形变机制主要与石化产业园地下水开采、液化储气设施建设以及地区软土层分布有关。本文的研究结果对漳州以及沿海地区的地质灾害防治与预测具有重要的参考价值。

In recent ten years,the ground subsidence frequently occurred in the coastal area of Zhangzhou,which caused huge economic loss,hidden danger,and environmental problems such as seawater intrusion and land salinization.Therefore,the rapid and timely monitoring of surface deformation information in coastal areas is of great significance to protect the safety of coastal areas.With the advantages of large-range,high-accuracy,and high-resolution,InSAR is becoming an effective method for surface subsidence monitoring.Based on the SBAS-InSAR technique,the average subsidence rate and accumulated deformation variables of the coastal areas of Zhangzhou were obtained from 34-view ALOS1/PALSAR images from July 2007 to March 2011.By combining with geological information,the deformation features of the study area are interpreted.The results show that the maximum deformation rate of Gulei petrochemical base in Gulei peninsula,Zhangjiang delta,and the southern part of Duxun and Shaxi towns can reach 24 mm/yr during this period.The mechanism of surface deformation in this area is mainly related to the exploitation of groundwater,the construction of liquefied gas storage facilities,and the distribution of soft soil layer.The results of this paper are of important reference value for the prevention and prediction of geological hazards in Zhangzhou and coastal areas.