Rainfall-induced landslides not only cause property loss, but also kill andinjure large numbers of people every year in mountainous areas in China.These losses and casualties may be avoided to some extent with rainfallthreshold values used in an early warning system at a regional scale for theoccurrence of landslides. However, the limited availability of data alwayscauses difficulties. In this paper we present a method to calculate rainfallthreshold values with limited data sets for two rainfall parameters:hourly rainfall intensity and accumulated precipitation. The method has beenapplied to the Huangshan region, in the province of Anhui, China. Four earlywarning levels (zero, outlook, attention, and warning) have been adopted andthe corresponding rainfall threshold values have been defined by probabilitylines. A validation procedure showed that this method can significantlyenhance the effectiveness of a warning system, and finally reduce andmitigate the risk of shallow landslides in mountainous regions.
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