论文部分内容阅读
活动构造是影响地质灾害发生的主要因素之一.利用SRTM-3数字高程模型(digital elevation model,简称DEM)数据,基于ArcGIS空间分析技术及Matlab程序脚本系统提取白龙江流域宏观地貌信息、拟合流域内部7个4级亚流域的S-A图解,并结合流域内部新构造特征、活动断裂分布、岩性展布特征以及降水条件等系统分析了白龙江流域滑坡泥石流地质灾害发育的控制因素.其中,S-A拟合图形上凸者代表流域内物质的输出量大于输入量,反之,S-A拟合图形下凹者代表流域内物质的输出量小于输入量,而物质输入表现为山体隆升,较大的物质输出量具体表现形式即为突发事件形成的滑坡、泥石流灾害;另外区域构造运动控制下的强烈褶皱破碎甚至糜棱化或半糜棱化岩层分布也是地质灾害发生必不可少的条件.受上述因素综合影响,本区地质灾害通常发生在高程突变、起伏度与切割深度大的高坡度分布区,而由于区域差异隆升所形成的不同的亚流域地貌形态则控制了地质灾害高发区,即物质输出量大于输入量的亚流域内部滑坡泥石流等地质灾害频繁,而输入量大于输出量的亚流域内部并无明显地质灾害分布点.
The active tectonics is one of the main factors affecting the occurrence of geological disasters.Using the data of SRM-3 digital elevation model (DEM), the macro-topography information of Bailong River Basin is extracted based on ArcGIS spatial analysis technology and Matlab program script system, SA diagram of seven inner 4th grade sub-basins, and combined with the new tectonic features, active fracture distribution, lithological distribution characteristics and precipitation conditions in the basin, the controlling factors of landslide debris flow geological disasters in Bailongjiang River Basin are analyzed. Among them, SA On the other hand, the sagging of the SA fitting pattern represents that the output of the material in the basin is smaller than the input, while the material input shows the uplift of the mountain and the larger material output The concrete manifestation is the landslide and debris flow hazard caused by emergencies. In addition, the strong folds or even the mylonized or semi-milled strata under the control of regional tectonic movement are also the necessary conditions for geological disasters. Taken together, the geological disasters in this area usually occur when the elevation is abrupt, the undulating degree and the cutting depth are large Slope distribution, and different sub-basin topography formed due to regional differences uplift control the high incidence of geological disasters, that is, geological disasters such as landslides and debris flows with sub-basins where the material output is greater than the input amount are frequent while the input amount is greater than the output The amount of sub-basin within the obvious distribution of geological disasters.