Abstract:

Based on a certain regional division of China, rainfall thresholds for regional landslides in different areas were collected. The distribution of thresholds of forecasted 24 h rainfall show that they are highly correlated to climate and are approximately 0.04-0.08 times of mean annual precipitation (MAP). A review of domestic researches showed that the influence of heavy rainfall in short term couldn’t be reflected from current rainfall thresholds which were often obtained without enough argumentation. A rainfall intensity-duration threshold I=4.0D^-0.51 was obtained for the west area of Hubei Province with a method advised for defining the start point of rainfall duration.

Key words: regional landslides, rainfall threshold, intensity-duration curve, mean annual precipitation