Study of non-contacted warning methods of the initiation of debris flows

After the earthquake in WenChuan County, SiChuan Province of China, an increasing number of geologic hazards have happened in the disaster area. Based on the program of the construction of landslides and debris flows monitoring and warning system, this paper pays a main attention on the analysis of the warning methods of the initiation of debris flows, which means the alarm will be set off at the time when a debris flow breaks out in the upstream. After arranging abundance data of debris flows monitoring system in China and abroad, the merit and demerit of different non-contacted monitoring instruments are analyzed, especially for geosound and infrasound. At last, some ideas and suggestions are given for the construction of debris flows monitoring and warning system in the disaster area and the development direction of researching on debris flows are discussed.