Combined observations of surface displacements using Differential Interferometry SAR (DInSAR), GPS and traditional monitoring techniques
Combined observations of surface displacements using Differential Interferometry SAR (DInSAR), GPS and traditional monitoring techniques
复制标题
使用差分干涉SAR (DInSAR)、GPS 和传统监测技术联合观测地表位移
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
G. Ruello
中科院分区：
文献类型：
--
作者：
A. Iodice;M. Ramondini;G. Ruello
地震、强降雨、人类活动等不同原因引起的缓慢移动的滑坡影响范围广泛，给人类社会带来高昂的成本，对财产和生命线造成严重破坏。在复杂的地质环境中，不同类型的大规模运动广泛存在，监测是风险预防和缓解过程中的关键活动。在这些情况下，需要定期持续监测，以正确建立因果关系，并预测可能的重新激活阶段。从这些考虑出发，工作重点是不同滑坡监测方法的应用，特别关注 DInSAR 和 GPS 等遥感技术。后者可能有助于克服传统技术的典型局限性，从“逐点”分析到“广域”分析，并保持最终结果的高精度。近年来，来自多个卫星平台（例如 ERS 1 和 2、Envisat、Cosmo Sky-Med）的 SAR 数据的大量可用性、卫星性能的不断改进以及更可靠的处理技术的开发，使得星载 DInSAR 技术对地球科学界非常有吸引力。为了验证这些技术，根据地质、地貌和岩土工程特征以及之前传统监测活动（测斜仪、渗压计和地形测量）的数据可用性，在意大利南部确定了两个地点。为了分析地形运动，制造并安装了三面角反射器。此外，还建立了移动GPS网络，以完成和比较使用特定DInSAR技术识别的运动，即小基线子集（SBAS），该技术通过所有可用干涉图的有效组合使用多个小基线采集子集。对迄今为止所进行的研究的结果进行了分析和批判性讨论。
Slow‐moving landslides, induced by different causes, such as earthquakes, intense rainfall, anthropogenic activities, affect wide areas, resulting in high costs for the human society and severe damage to properties and lifelines. In complex geological settings, where mass movements of different types are widespread, monitoring represents a key activity in the process of risk prevention and mitigation. In these cases, a regular and continuous monitoring is required to correctly establish a cause-effect correlation, and to predict possible reactivation phases. Starting from these considerations, the work was focused on the application of different methods of landslide monitoring, with special attention for remote sensing techniques such as the DInSAR and GPS. The latter may contribute to overcome typical limitations of traditional techniques, going from a “point-wise” to a “wide area” analysis and preserving the high accuracy of the final results. In recent years the great availability of SAR data from several satellite platforms (e.g. ERS 1 and 2, Envisat, Cosmo Sky-Med), the continuous improving of the satellites performances and the development of more reliable processing techniques as well, made space‐born DInSAR techniques very attractive to the Earth Sciences’ scientific community. To validate these techniques two sites were identified in southern Italy, on the basis of their geological, geomorphological and geotechnical characteristics, as well as of the availability of data from previous traditional monitoring campaigns (inclinometers, piezometers and topographic measurements). In order to analyze terrain movements, trihedral corner reflectors have been manufactured and installed. Moreover, a mobile GPS network has been set up in order to complete and compare movements identified with a specific DInSAR technique, Small BAseline Subset (SBAS), which uses multiple small baseline acquisition subsets via an effective combination of all the available interferograms. Results deriving from the research so far carried out are analyzed and critically discussed.