Meteorological warning for rainfall-induced slope instability risk
A slope-scale meteorological warning model for rainfall-induced slope instability risk was constructed using benchmark threshold and a threshold adjustment scheme,in order to carry out refined landslide risk management.The benchmark threshold was proposed by the intensity-duration model.Adjusting factors were selected from slope geometry,rock and soil shear strength,hydrogeological conditions and vegetation based on the characteristics of the slope geological environment,and the benchmark slope was determined.The threshold adjustment scheme was obtained from the perspective of rainfall infiltration process,which explored the variation of the slope stability caused by the changes of the geological environment.Taking Pingyang County in Zhejiang Province as the study area,a quantitative formula was defined for calculating the threshold of individual slopes.Thresholds corresponding to different warning levels were formed based on the environment of each slope.The comprehensive early warning effectiveness rate reached 72％,which showed a satisfactory warning effect.An innovative slope-scale risk warning model was proposed.The precise landslide early warning at slope-unit scale was realized,which can provide new ideas and references for refined landslide early warning and risk management on purpose of"each-slope,each-threshold".
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