基于遥感与地质耦合法的水库滑坡群特性解译研究

Interpretation of characteristics of reservoir landslides based on remote sensing and geological coupling method

某水库库区滑坡群为多个滑坡体相互叠加、交错所构成,呈多级多次滑动特性,致其规模调查、变形监测和风险评估等极为复杂。本文利用遥感与地质耦合法,实现滑坡群特性的有效解译,为后续滑坡群变形监测、风险评估及成库论证等提供基础数据源。结果表明,遥感解译滑坡群的关键在于选择合理的识别标志和时间序列,影像NDVI值结合目视解译可使滑坡群有效识别率达80%以上;传统地质法可获得滑坡群局部和微观特性,有效识别率低于60%;而遥感与地质耦合法可在整体和局部、宏观和微观上相互补充和校正,有效识别率达95%以上。

The landslide group in a reservoir area is composed of multiple landslide bodies,which are overlapped and interlaced,showing multi-level and multiple sliding characteristics,resulting in extremely complex scale investigation,deformation monitoring and risk assessment.Coupling remote sensing and geology are used to realize the effective interpretation of the characteristics of landslides,and provides basic data sources for the follow-up deformation monitoring,risk assessment and database demonstration of landslides.The results show that,the key to remote sensing interpretation of landslides is to select reasonable identification marks and time series,and the combination of image NDVI value and visual interpretation can make the effective recognition rate of landslides more than 80%;The traditional geological method can obtain the local and micro characteristics of landslide group,and the effective recognition rate is less than 60%;However,the coupling method of remote sensing and geology can complement and correct each other in whole and part,macro and micro,and the effective recognition rate is over 95%.