Abstract
Reservoir landslide is a type of commonly seen geological hazards in reservoir area and could potentially cause significant risk to the routine operation of reservoir and hydropower station. It has been accepted that reservoir landslides are mainly induced by periodic variations of reservoir water level during the impoundment and drawdown process. In this study, to better understand the deformation characters and controlling factors of the reservoir landslide, a multiparameter-based monitoring program was conducted on a reservoir landslide—the Hongyanzi landslide located in Pubugou reservoir area in the southwest of China. The results indicated that significant deformation occurred to the landslide during the drawdown period; otherwise, the landslide remained stable. The major reason of reservoir landslide deformation is the generation of seepage water pressure caused by the rapidly growing water level difference inside and outside of the slope. The influences of precipitation and earthquake on the slope deformation of the Hongyanzi landslide were insignificant.
Highlights
Landslide induced by reservoir impoundment and drawdown is a commonly seen geological hazard in reservoir area and has caused significant impacts and damages on the operation and function of hydropower stations all over the world
The large landslides of the sizes greater than ten million cubic meters were normally triggered by the rapid declination of the reservoir water level
The findings presented in this paper could offer the valuable insights into the planning of prevention and control of geological hazards in the Pubugou Hydropower Station reservoir area and relevant studies on reservoir induced landslides in the world
Summary
Landslide induced by reservoir impoundment and drawdown is a commonly seen geological hazard in reservoir area and has caused significant impacts and damages on the operation and function of hydropower stations all over the world. By conducting numerical analysis [6, 7], the risk management of potential impulse wave by the slope movement draws more attentions The majority of these researchers are intent to provide a complete overview/analysis on the whole process of the disaster chain, including the deformation triggering of the landslide to the Geofluids generation of impulse wave, as well as the resulted potential hazard to the properties in the reservoir or on the opposite bank [2, 3]. The data communication and compatibility of the data processing software for comprehensive slope dynamic performance is a major research issue It is important in theory and engineering practice to study the impact and casual correlations among reservoir water level fluctuation, hydrodynamic, and deformation characters of reservoir landsides.
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