Remote Sensing Investigation and Mechanism Research of Tiantai Landslide in Sichuan Province

The large rainstorm happened on Sep. 3, 2004 at Tiantai village of Xuanhan County, Sichuan province, which lead to a oversize landslide. The foreside of landslide slid into the Qian river and formed a dam about 20m height, jammed the Qian river and caused heavy damage and loss. Based on the digital landslide and 3D Visualization Technique, the research of the landslide was started by using the high resolution satellite images of pre-landslide (INKONOS image) and post-landslide (QUICKBIRD image). Remote sensing investigation, human-machine interactive interpretation was used to confirm the borderline, form, feature and area of the landslide, the twin characteristic dots was used to deduced slip direction and slip distance. The paper makes good use of geology theory to discuss the formation and mechanism of landslide, Synthetically analyzing the characteristic of deposit, it is deduced Tiantai landslide is a large typical drag and along-bedding slope landslide. The slide mode of distortion and breach is belonged to plastic flow-tensile fracturing of slope. * Corresponding author.Tel.:+86-01-82329273;Fax:+86-01-82329035.E-mail address:[email protected] Fund project: Sponsored by the Large-scale Investigation of Land and Resources(200416000003)