基于GIS甘肃中南部滑坡泥石流活动强度评价  

Evaluation on Landslide-Debris Flow Activity Magnitude in the Middle-South of Gansu Province based on GIS

作　　者：赵洪涛[1] 孙会国[2] 王文瑞[1] 杨军[3] 姚正学[3] 张林源[1] 

机构地区：[1]兰州大学地理科学系,甘肃兰州730000 [2]中国科学院地质与地球物理研究所,北京100029 [3]甘肃省科学院地质自然灾害防治所,甘肃兰州730000

出　　处：《中国沙漠》2005年第6期897-903,共7页Journal of Desert Research

基　　金：甘肃省科技攻关项目(GS-982-096);甘肃省"555创新人才工程"基金资助

摘　　要：以甘肃中南部为研究区,采用GIS、MATLAB、FUZZY相结合的评价方法,收集筛选评价指标数据,基于GIS进行数据处理、转换,将各层对应的2 km×2 km栅格数据转入MATLAB,建立成因性指标与滑坡泥石流活动强度的模糊隶属关系,基于GIS进行空间分析,确定评价指标划分等级,设计不同权重方案,在MATLAB中编程试算,试算结果用重点(样)区特征性数据所反映的强度大小与相对等级,进行拟合检验与灵敏性检验,进一步调整指标等级与权重参数,最终得到符合成因机制的滑坡泥石流活动强度评价等级分布。结果表明该评价方法高效实用、精度高,可以进行高分辨率区域评价、区域仿真模拟、区划等工作。Taking middle-south of Gansu province as the study areas, the paper presents a fuzzy membership assessment approach based on GIS and MATLAB technologies, the causative factors of the landslide-debris flow are represented by raster of GIS layers with finer resolutions, which is at 4 km^2 . Firstly, the layers are imported into MATLAB and processed by MATLAB scripts according to the established fuzzy membership relationship between the causative factors and the magnitude of the landslide-debris flow activities, different weight levels are defined by the spatial analysis supported by GIS. Secondly, to adjust the weight of the parameters, according to landslide-debris flow mechanic analysis and field survey results by examination of imitation and sensitivity. Finally, Landslide-debris flow activity magnitude zones in the study areas are mapped. The final results indicate that the approach is more efficient and accurate than the traditional methods and helpful to develop the regional evaluation, regional planning, regionalization and the simulating calculation of landslide-debris flow.

关 键 词：甘肃中南部 滑坡泥石流活动强度 模糊等级评价 

分 类 号：P642.2[天文地球—工程地质学]