摘要
对九岭区地质灾害发育的基本特征及其地质环境条件进行了概述,并对其形成条件进行了相关性分析;通过对地质灾害发育的基本规律、控制因素、触发因素与地质灾害关系的分析,采用环境地质学原理,建立区域地质灾害空间预测模型,圈定九岭区地质灾害的危险性分区,为实时地质灾害时间预警预报圈定有效的空间靶区。预测单元采用规则的栅格(500m×500m),共14415个单元;评价指标主要包括地形地貌、工程地质岩类、地质构造、破坏地质环境人类工程活动等四大类26个因子;利用GIS技术,提取出相关的数据信息;信息量预测方程:Ii=-1.164X1-0.999X2-0.681X3+……+0.203X25-0.135X26(其中X1、X2、X3、…X26取1或0,即某单元中存在某种因素时取1、否则取0),据此计算出各单元格的信息量;根据地质灾害危险性分区临界指标,确定单元格的地质灾害危险性等级;合并同类项,并考虑类似的地质、自然环境具有类似的地质灾害问题的原则,进行归并与单元边界线的修改,得出九岭区地质灾害危险性分区。
In this thesis, the basic characters and enviroment of the hazards in Jiuning area are summarized.And the relationships between hazards and the inducing factors are analyzed. Then the regional geo -hazard spacial prediction model is established and the zonation is finished, which provide effective spacial target for geo -hazard real -time warning and prediction for the research area. The detailed processes is：
Ⅰ Dividing the area into 14415 small regular foursquare grids with 500m length of side.
Ⅱ Selecting 4 appropriate primary evaluation indexs with 26 secondary factors, including topography, stratum, structure, and engineering by human beings. m Extracting essential data by technique of GIS to get the information prediction equation as following：
Ⅰi = - 1. 164X1 -0.999X2 -0. 681X3 ＋ ……＋0. 203X25 -0. 135X26
In the above equation, the factor in each grid is 1 when exist and 0 when not exist. So each gird will has information according to the information equation.
Ⅳ Determing the hazardous grade in each grid by the geo -hazard zonation critical value and the information amount in each grid. Ⅴ Merging the grids which have the information in a same scale and have similar geological environment and similar geo -hazard problems, and modifying the map border to get a geo -hazard zonation map for Jiuning area.
基金
国土资源大调查项目"江西省重点地质灾害易发区地质灾害监测预警示范"(1212010541103)资助
