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地形起伏度是开展区域滑坡敏感性和危险性评价的基础数据,其提取精度直接影响区域滑坡危险性评价和风险评估的正确性。本文以四川省低山丘陵区为研究区,基于邻域统计分析算法提取不同窗口半径下的平均地形起伏度,表明平均地形起伏度与分析窗口尺度存在显著的对数变化关系;根据地貌发育理论,应用累积和分析算法(CUSUM)对“平均地形起伏度-分析窗口半径”曲线的突变情况进行分析,通过精度检验,确定该区域地形起伏度提取的最佳统计窗口半径为1.1km。研究结果对于提高相似区域的滑坡灾害危险性评价和风险评估的精度有参考价值。
The undulation of topography is the basic data to carry out the sensitivity and risk assessment of landslide. The accuracy of extraction has a direct impact on the correctness of landslide risk assessment and risk assessment. In this paper, the hilly region of Sichuan Province as a study area, based on the statistical analysis of neighborhoods to extract the average window topography under different window radius fluctuations, indicating that the average relief and the analysis window scale has a significant logarithmic change; According to the theory of topography , The cumulative average and analysis algorithm (CUSUM) was used to analyze the abrupt change of the average terrain relief - the analysis window radius curve. Through the accuracy test, the optimal statistical window radius for the extraction of terrain relief was determined to be 1.1km. The research results have reference value for improving the landslide disaster risk assessment and risk assessment in similar areas.