The study on the Method of High-precision Geological Hazard Remote Sensing Interpretation of Reservoir in the Mountain and Ravine Region of Southwest China

摘要

The geological disaster investigation on reservoir area is one of the main tasks in engineering geological investigation of reservoir and is of an important basis and primary data of engineering geological evaluation. The traditional method of locating geological disaster needs a lot of manpower and resources, which will normally incur high cost. Also, sometimes it is very difficult or close to impossible to have the research done at the field due to the inconvenient transportation and complex geographic condition. Meanwhile, the restriction of horizon makes it hard for geological engineers to get familiar with geological bodies in a whole. With the advance of RS (remote sensing)application, GIS(Geography Information System)techniques and 3D(three-dimensional)interpretation analysis method, high precision geological hazard investigation can be achieved with fewer field work if the spatial information and 3D visualization technology are used. This paper focuses on geological hazard investigation of reservoir area in southwest China. It studies the formation mechanism, scales and stabilities of landslide, avalanche and debris flow. Based on a GIS platform, multi-source collection, process and extraction have been made. It fully makes use of multi-spectral technique and integrates the spatial analysis with the true color 3D visualization. Using the method of terrain analysis, image interpretation, along with field confirmation, a 3D geological hazard visualization system can be established. In this paper, the used method combines GIS techniques, RS and 3D visualization together. Some applications on geological hazard interpretation with the precision of 1:10000 or even higher(1:5000-1:2000)have been done in Baihetan hydropower station of the Jinsha river, Wudongde hydropower station of the Jinsha River, Lenggu hydropower station of the Yalong River and Xiaerga hydropower station of the Dadu River. With those projects, a new high-precision interpretation procedure and its related characteristic gallery have been established on the basis of terrain analysis, image interpretation combined with 3D true color interpretation. This method not only improves interpretation precision, but reduces the workload of field geological survey as well. What's more, a new result data management mode is formed based on project database, which can avoid data confusion and inconvenience.