基于PSInSAR技术的地面沉降监测研究——以北京怀柔区为例

怀柔应急水源地是北京第一个建成的特大型应急备用水源地,经过数年的开采后,应急水源地水位大幅度下降,地下水漏斗面积不断扩大。PSInSAR技术在监测地面沉降方面具有很大的优势,本文利用PSInSAR技术和2003年—2009年间28幅Enviast卫星的ASAR影像监测怀柔应急水源地地区地面沉降情况,试验结果表明该地区平均沉降量为8mm/a。通过该地区地面沉降状况和地下水漏斗发展趋势之间的对比,发现地面沉降范围和地下水漏斗有较大的空间一致性,平面分布趋势整体上由南西—北东向北西—南东转变。

Monitoring Iand subsidence based on PSInSAR

Huairou Emergency Water Source is the first oversize emergency water source in Beijing.Because of the continuing over-exploitation of groundwater,the water level dropped significantly in the emergency water source,and the area of groundwater depression cone is expanding.Persistent Scatterers for SAR Interferometry(PSInSAR) is a well-known remote sensing technique with the ability to monitor ground deformations.This study applied the PSInSAR technique to monitor the subsidence phenomena due to the overexploitation of groundwater in Huairou Emergency Water Source.A series of Envisat ASAR images from 2003-2009 were used to monitor the ground deformations in the study area.It was found that there is a subsidence trend in the study area and the area was expanding from 2003-2009 with the mean subsidence velocity of 8mm/a.A spatial correlation was observed between the groundwater depression cone and the subsidence area,which changed from SW-NE to NW-SE.