地质灾害控灾因素的遥感地质分析--以藏南拉轨岗日地区为例

以实地调研数据为基础,在综合分析TM影像所提供的空间及光谱信息之后认为:(1)拉轨岗日变质核杂岩带通过其接触带中的断裂体系直接控制相应的地质灾害,通过所形成的构造地貌和特征水系对地质灾害的孕育、规模和强度产生间接影响;(2)拉轨岗日变质核杂岩带各个组成变质核杂岩的接触带及其外延的盖层区域因受构造变动的影响而成为崩塌、滑坡和泥石流等地质灾害的易发区域;(3)研究拉轨岗日变质核杂岩带的结构形式及成因模式可对地质灾害易发区域的圈绘起到指导作用.

Remote sensing geological analysis of controlling factors for geologic disaster:taking case study of Laguigangri Region in south Tibet as an example

Based on investigation on the spot and the comprehensive analysis of the spatial and spectral information from TM image,the authors believe that:(1) the Laguigangri metamorphic core complex(MCC) zone controls the geologic disaster directly through the fault system that develops in its contact-zone and affects the geologic disaster gestation,scale and intensity indirectly through the tectonic landform and character water system;(2) affected by the tectonic alteration,the contact-zone and the part cover extending from contact-zone of each metamorphic core complex belonging to the Laguigangri MCC zone become a such region that the geologic disasters occurred easily.Disasters include the collapse,landslide and debris flow,etc;(3) to study the structural pattern and its genesis model can supervise mapping the area where the geologic disaster occurs easily.