基于MAPGIS的西安地裂缝分析应用

The Application of MAPGIS to the Researches on Geofractures in Xi'an Area

地裂缝是西安市区较为严重的地质灾害,其影响因素有构造运动、地下水开采、地形地貌、地层条件等。本文将具有统一地理坐标和空间分析能力的MAPGIS地理信息系统应用于地裂缝活动强度评价,根据对地裂缝影响因素的分析,建立层次分析模型,计算每一影响因素的权重,确定在GIS支持下的地裂缝活动强度评价模型。再通过MAPGIS图形、图像处理等模块对各单因素专题层进行地图代数运算,得出地裂缝影响因素叠加图像并确定分区阈值,以此为依据对西安地裂缝活动强度进行分区,进而实现对地裂缝活动强度的预测。

Geofracture, as one of the severe geological hazards appearing in Xi＇an area, has become considerably serious. The factors influencing the result of the geofractures in Xi＇an include structural movement, groundwater mining, geomorphology and stratigraphy. The MAPGIS, a geographic information system, has a unified analytic capability in geographic coordinates and spaces. In this article, the geographical information system, MAPGIS, is used for assessment of the intensities of geofracture activities. Based on the analysis of the influencing factors of geofratures, an analytical model for different levels has been created, each weight of influence factors is calculated and an assessment model under the support of GIS for geofracture activities confirmed. Then, according to the modules of MAPGIS maps and image processing, algebraic calculation of maps on some special topics for individual factor has produced superposed images with the influencing factors of geofractures and confirmed the value of division. Based on the results, the active intensities of geofractures in Xi＇an area can be partitioned and predicted.