滑坡编录表达模式对易发性评价结果的影响

Analysis of the impact of landslide cataloguing expression patterns on the evaluation results of landslide susceptibility

以贵州省六盘水市水城区为例,采用点单元与面单元两种滑坡编录模式,选取相同因子分级与易发性分级方法,对比分析两种模式下滑坡易发性评价结果的差异性。选取海拔高度、坡向、坡度、起伏度、斜坡结构、工程岩组、矿山相对密度、与河流间的距离、与道路间的距离9个因子,使用信息量法对研究区进行滑坡易发性评价。结果表明:基于面单元的易发性评价结果精度高于点单元评价结果,其易发性分级结果的合理性同样明显优于点单元。使用面单元能够提高滑坡易发性精度的原因是其能表达更多的空间信息。

Taking Shuicheng District of Liupanshui City, Guizhou Province as an example, two landslide cataloging modes, point unit and area unit, are adopted, and the same-factor classification and susceptibility classification methods are selected to compare and analyze the difference of landslide susceptibility evaluation results under the two modes. Nine factors, including elevation, slope aspect, slope, relief, slope structure, engineering rock group, relative density of mine, distance between river and road, are selected to evaluate the landslide susceptibility of the study area by using information amount method. The results show that the accuracy of the assessment results based on the area unit is higher than that of the point unit, and the rationality of the assessment results of the susceptibility of area unit is also obviously better than that of the point unit. The study shows that the use of area unit can express more spatial information, thus improving the accuracy of landslide susceptibility.