Abstract
Although landslide early warning and post-assessment is of great interest for mitigating hazards, emergency disposal solutions for properly handling the landslide and dammed lake within a few hours or days to mitigate flood risk are fundamentally challenging. In this study, we report a general strategy to effectively tackle the dangerous situation created by a giant dammed lake with 770 million cubic meters of water volume and formulate an emergency disposal solution for the 25 million cubic meters of debris, composed of engineering measures of floodgate excavation and non-engineering measures of reservoirs/hydropower stations operation. Such a disposal solution can not only reduce a large-scale flood (10,000-year return period, 0.01%) into a small-scale flood (10-year return period, 10%) but minimize the flood risk as well, guaranteeing no death raised by the giant landslide.
Highlights
We propose an emergency disposal solution combining structural and nonmeasures to reduce the flood risk encountered in a giant landslide and dammed lake
The loss of life and destruction of property caused by catastrophic debris flows around the world will most likely continue intensifying as the world population increases, urban development boosts, deforestation expands and land-use alternates
We proposed an emergency disposal solution for adequately processing the landslide and dammed lake
Summary
Landslides can be attributed to rainstorms [1,2,3], earthquakes [4,5], avalanches, human construction activities, land-use change [6,7,8] as well as natural processes of erosion that ruin land slopes [9,10]. In close association with theoretical considerations, predicts that the intensity of giant landslides will increase in a climate and anthropogenic changes setting according to physical experiments and post-assessment [12,13]. The potential for a giant landslide intensification with earthquake, rainfall-induced storm runoff, and avalanche is of significant societal concern, with a huge dammed lake inducing dam break, flash floods and debris being one of the costliest and dangerous natural hazards worldwide [14].
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