基于差分干涉的大理“5.21”震后地质形变分析及其对电网设施影响

DInSAR-Based Analysis of Geological Deformation after the“5.21”Earthquake in Dali and Its Impact on Power Grid Facilities

地震具有突发性强、破坏性大的特点,震后也会造成大面积的地形变化,形成地质沉降、滑坡等次生灾害,此类次生灾害可能会造成电网杆塔沉降、移位等,威胁线路安全运行,提前进行相应的地质沉降风险排查具有重要意义。星载合成孔径雷达作为一种全天时、全天候的微波遥感成像技术,为高精度、低成本地实现大范围观测以及地表形变监测提供了可能,为灾情的勘测及处置措施提供辅助指导。本文以大理市漾濞县“5.21”地震为例,分析了本次地震中地质形变的变化,以及地震中电网输电设备的地质沉降风险情况,给出了相应的运维建议。

The earthquake has the characteristics of strong suddenness and great destructiveness.After the earthquake,it will also cause large-scale topographical changes,forming secondary disasters such as geological subsidence and landslides.Such secondary disasters may cause the settlement and displacement of power grid poles,and may threaten the safe operation of the line.Therefore,it is of great significance to carry out the corresponding geological settlement risk investigation in advance.Spaceborne synthetic aperture radar,as an all-weather and all-weather microwave remote sensing imaging technology,provides the possibility to achieve large-scale observations and surface deformation monitoring with high precision and low cost,and provides auxiliary guidance for disaster survey and disposal measures.Taking the“5.21”earthquake in Yangbi County,Dali City as an example,this paper analyzes the geological deformation during the earthquake and the geological subsidence risk of power grid transmission equipment during the earthquake,and gives corresponding operation and maintenance recommendations.