顾及地貌形态特征的精细斜坡单元高效分区划分  

An efficient and fine slope units division method with consideration of the regional geomorphological characteristics

作　　者：刘越凡 付萧 朱庆 曾浩炜 吴浩宇 LIU Yuefan;FU Xiao;ZHU Qing;ZENG Haowei;WU Haoyu(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《测绘科学》2023年第4期211-220,共10页Science of Surveying and Mapping

基　　金：地质灾害隐患综合遥感识别与应用示范项目(DD20211365);自然资源部城市国土资源监测与仿真实验室开放基金项目(KF-2020-05-032)。

摘　　要：针对现有方法广域范围复杂地貌类型斜坡单元精细划分效率低的问题,该文提出一种顾及地貌形态特征的精细斜坡单元分区划分方法。首先通过典型地貌形态特征对广域范围进行分区,然后基于水文原理和A^(T)最低成本搜索算法精准提取各分区内的斜坡单元,最后根据坡向圆方差对分区内的斜坡单元进行优化。采用四川省全域30 m分辨率的数字高程模型(DEM)数据进行实验,根据地形起伏度和海拔高度将整个区域按6类地貌形态进行分区优化,在保持全域范围斜坡单元内部坡向均质性的同时,相较于常用的正反向DEM水文法划分效率提升了70.31%。与基于格网单元的滑坡易发性评价进行对比,基于该文所提取斜坡单元的滑坡易发性评价在精度上有4%以上的提升。In view of the low efficiency of the existing methods for the fine division of slope units in a wide area with complex geomorphological types,a slope units division method that considers the geomorphological characteristics was proposed in this paper.First,the wide area was divided by typical geomorphological features,then the slope units of each partition were accurately extracted based on hydrological principles and A~T least cost path search algorithm,and finally,the slope units in each partition were optimized according to the circular variance of slope aspect.The digital elevation model(DEM) with a resolution of 30 m in the whole area of Sichuan province was used for the experiment,and the whole area was divided and optimized according to 6 main geomorphological types based on topographic relief and altitude,which improved the efficiency of the division by 70.31% while maintaining the internal homogeneity of slope aspect within slope units in the whole area compared with common hydrological process analysis method.In comparison with the evaluation of landslide susceptibility based on grid cells,the evaluation based on slope units extracted by the proposed method had an improvement of more than 4% in accuracy.

关 键 词：斜坡单元 数字高程模型 地貌形态特征 坡向均质性 滑坡易发性评价 

分 类 号：P208[天文地球—地图制图学与地理信息工程]