remote sensing Article Characterizing the Development Pattern of a Colluvial Landslide Based on Long-Term Monitoring in the Three Gorges Reservoir Xin Liang 1, Lei Gui 1,* , Wei Wang 2, Juan Du 3, Fei Ma 4 and Kunlong Yin 1 1 Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
[email protected] (X.L.);
[email protected] (K.Y.) 2 School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;
[email protected] 3 Three Gorges Research Center for Geohazards, Ministry of Education, China University of Geosciences, Wuhan 430074, China;
[email protected] 4 Geohazard Prevention Center, Chongqing 404100, China;
[email protected] * Correspondence:
[email protected]; Tel.: +86-134-7621-3048 Abstract: Since the impoundment of the Three Gorges Reservoir (TGR) in June 2003, the fluctuation of the reservoir water level coupled with rainfall has resulted in more than 2500 landslides in this region. Among these instability problems, most colluvial landslides exhibit slow-moving patterns and pose a significant threat to local people and channel navigation. Advanced monitoring techniques are therefore implemented to investigate landslide deformation and provide insights for the subsequent countermeasures. In this study, the development pattern of a large colluvial landslide, locally named the Ganjingzi landslide, is analyzed on the basis of long-term monitoring. To understand the kinematic characteristics of the landslide, an integrated analysis based on real-time and multi-source monitoring, including the global navigation satellite system (GNSS), crackmeters, inclinometers, and piezometers, was conducted. The results indicate that the Ganjingzi landslide exhibits a time-variable Citation: Liang, X.; Gui, L.; Wang, response to the reservoir water fluctuation and rainfall.