Frequent geologic disasters cause huge impact on human society. Remote sensing, geographic information systems, global positioning systems and network technology play increasingly great role in disaster reduction. In Lanzhou, the regional lithology, tectonic faults, seismic activity, surface erosion and undulating terrain have contributed to crushing landslide and debris flow hazards. Summer torrential rains and human engineering activities induce disasters in every summer. Through establishing spatial database of regional landslide and debris flow disasters, using spatial analysis, the expertise model and Logistic model for predicting the probability of landslide and debris flow hazards are achieved in this study. The predicted landslide accuracy of Logistic model and the empirical model reach 85.3% and 74.2%, respectively. The predicted debris flow accuracy of Logistic model and the empirical model reach 80.5% and 90.5%, respectively.
Introduction
