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斜坡地表形态对滑坡的孕育起着重要控制作用,地形参数的提取及地形地貌对滑坡的影响是区域滑坡灾害评价的必要过程。文中利用最小流域和精密河网将研究区划分为31418个自然斜坡单元,利用ArcGIS区域统计功能提取斜坡单元的地形参数,分析研究区斜坡的坡体形态分布规律。依据区内292处滑坡调查点的资料,统计分析不同坡体形态下的滑坡发生概率,结合数值模拟分析结果,确定黄土斜坡发生滑坡的坡型、坡度、坡高及坡向敏感性。分析结果表明:研究区凸型斜坡发生滑坡的概率最高;随着斜坡坡度和坡高增大,发生滑坡的概率增大;阳坡发生滑坡的概率明显高于其他坡向的边坡。
The shape of slope surface plays an important role in controlling the landslide. The extraction of topographic parameters and the influence of topography on the landslide are the necessary processes for the landslide hazard assessment. The study area is divided into 31418 natural slope units by using the least drainage area and the precision river network. The topographic parameters of the slope units are extracted by the statistical function of ArcGIS area, and the slope morphology distribution in the study area is analyzed. Based on the data of 292 landslide survey points in the area, the probability of landslides under different slope forms was statistically analyzed. Based on the results of numerical simulation, the slope type, slope, slope height and slope sensitivity of the landslide on the loess slope were determined. The results show that the probability of landslide is the highest in the convex slope of the study area, and the probability of landslide increases with the increase of the slope slope and slope height. The probability of landslide on the sunny slope is obviously higher than that of other slopes.