基于PS-InSAR技术的廊坊北部地区地面沉降监测研究

采用PS-InSAR技术对覆盖廊坊北部地区的33景Envisat ASAR影像进行处理，获取该地区2007～2010年平均形变速率场与季度时序沉降信息，并与沉降影响场数据进行耦合分析。结果表明： 1)宋庄-燕郊与五百户-大口屯等地区沉降发育较显著，季节性变动特征明显；2)山前与杨各庄-马坊地区呈高沉降梯度，平原区较高沉降梯度区多与-16 mm/a、0 mm/a等值线形态一致，差异性沉降特征显著；3)因第四系厚度、结构显著差异与断裂活动影响，北、东部断层两侧多表现为较高或渐变的形变梯度；4)差异性沉降展布与水源地、水位降深区具较好空间响应，且较严重沉降多为中深层承压水超采与城镇化建设所致。

Land Subsidence Detection Based on PS-InSAR Technology in Northern Area of Langfang City

This study conducts image processing of 33 ENVISAT ASAR data covering the northern area of Langfang city and extracts the annual average velocity and quarterly series information of land subsidence in the time span of 2007-2010. In addition, coupled analysis of subsidence monitoring data and influencing factors information is carried out to analyze causes. The results show: that the higher scale settlement areas are mainly distributed in Songzhuang-Yanjiao, Wubaihu-Dakoutun and other scattered areas with seasonal fluctuation due to rainfall recharge; there appear differential subsidence characteristics exhibiting high subsidence gradients in the mountain frontier and Yanggezhuang-Mafang areas, while monotonous appearances between rather high land subsidence gradient distributions and the -16 mm/a and 0 mm/a contour lines; there are rather high or gradual subsidence gradients on both sides of the faults in the northern and eastern parts of study area, due to the fault activities and significant difference in the thickness and structure of Quaternary aquifers system; an high agreement with the distributions of water head sites and drawdown area, revealing that the overexploitation of deep confined water and urbanization construction are the primary cause of severe subsidence.