Abstract
Hydrodynamic action plays an important role in the development of reservoir bank accumulational landslides. Despite recent concern over hydrodynamic action’s hysteresis effects, there is still no unified efficient method for quantifying lag time, which is a critical input to landslide prediction and early warning systems. To address this shortcoming, we selected a typical landslide, located in Three Gorges Reservoir, China, as a case study. On the basis of long-term monitoring data, we suggest that correlation analysis may work and attempt to use linear correlation first to quantify the lag time. We conclude that, from the macroscopic behavior point of view, linear correlation analysis does not work; neither the daily reservoir water level and its variation nor the daily rainfall and its accumulation exhibit a linear relationship with the surface accumulative displacement. Future studies will use nonlinear correlation analysis to analyze data by different time segments as the hydrodynamic factors have different effects in different periods.
Highlights
The construction of dams for electric power and water storage across the world has led to the reactivation of old landslides and the development of new landslides
Similar findings have been reported for the Berkeley Hills slide [4], Portuguese Bend landslide in southern California (2–6 weeks of lag time) [5], and Jinlongshan slide in Southwest China (1-2 months of lag time) [6]
It is known to all that hydrodynamic action plays an important part in the analysis of landslide stability [14,15,16,17,18], especially for reservoir bank accumulational landslides
Summary
The construction of dams for electric power and water storage across the world has led to the reactivation of old landslides and the development of new landslides. The widely accepted understanding is that water infiltrating into the bank increases the fluid pressure, which, in turn, reduces the effective stress, altering the strength of rock and soil mass. This can lead to surface rupture, which in turn promotes sliding [1, 2]. Haifeng Huang et al [7] reported that the Shuping landslide located in Three Gorges Reservoir exhibits a lag time of approximately 6 days after the reservoir water level is reduced. In an effort to determine an efficient method for quantifying the lag time from the macroscopic perspective, we first summarize and analyze the hydrodynamic action for the interpretation and better understanding of the hysteresis effect. We attempt to use correlation analysis to determine the temporal relationship, based on its long-term monitoring data, between surface displacement, reservoir water level, and rainfall
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