Debris flow were often triggered by rainfall and other extreme events.The occurrence character-istics and probability of debris flow after extreme rainfall were explored in the Chenyulan watershed in cen-tral Taiwan,China,which was affected by the Chi-Chi earthquake and extreme rainfall.The results showed that the critical rainfall intensity to induce debris flow after extreme rainfall events would decrease and then recover the original value.The reduction of critical rainfall intensity and the required recovery period were significantly correlated with the rainfall intensity of extreme rainfall events.The relation model between the occurrence probability of the debris flow P and the return period T showed that the occurrence probability of the debris flow increased significantly after extreme rainfall events,and the further verification on the P-T relation showed that the model could better predict the occurrence of debris flow disasters.The rainfall in-tensity triggering the debris flow before and after earthquakes was significantly different,and the combined effect of earthquakes and extreme rainfall was more apt to trigger the occurrence of debris flow disasters.
关键词
极端降雨/泥石流/泥石流概率/泥石流特征
Key words
extreme rainfall/debris flow/probability of the debris flow/characteristics of the debris flow
万方数据