Landslide susceptibility mapping using GIS-based weighted linear combination, the case in Tsugawa area of Agano River, Niigata Prefecture, Japan
Landslide susceptibility mapping using GIS-based weighted linear combination, the case in Tsugawa area of Agano River, Niigata Prefecture, Japan
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DOI：
10.1007/s10346-003-0006-9
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发表时间：
2004-03-01
期刊：
影响因子：
6.7
通讯作者：
Ugawa, Norimitsu
中科院分区：
文献类型：
--
作者：
Ayalew, Lulseged;Yamagishi, Hiromitsu;Ugawa, Norimitsu
利用地理信息系统（GIS）分析了791个滑坡的空间数据库，绘制了阿加诺川津川地区滑坡易发性图。从六个滑坡控制参数，即岩性，坡度，方面，高程，平面和剖面曲率的数据进行编码，并插入到地理信息系统。之后，采用指数为基础的方法，把各种类的六个参数，以他们的重要性的过程中的滑坡和权衡的影响，一个参数对另一个。应用一级和二级权重，得到了一个连续的数值指标尺度，并将研究区划分为5个滑坡易发性等级。斜坡坡度和海拔被认为是重要的，以划定平原，将在任何方式受到斜坡故障。高磁化率区位于中斜坡山区，砂岩、泥岩和凝灰岩等相对较弱的岩石作为一个单元出露。
A spatial database of 791 landslides is analyzed using GIS to map landslide susceptibility in Tsugawa area of Agano River. Data from six landslide-controlling parameters namely lithology, slope gradient, aspect, elevation, and plan and profile curvatures are coded and inserted into the GIS. Later, an index-based approach is adopted both to put the various classes of the six parameters in order of their significance to the process of landsliding and weigh the impact of one parameter against another. Applying primary and secondary-level weights, a continuous scale of numerical indices is obtained with which the study area is divided into five classes of landslide susceptibility. Slope gradient and elevation are found to be important to delineate flatlands that will in no way be subjected to slope failure. The area which is at high scale of susceptibility lies on mid-slope mountains where relatively weak rocks such as sandstone, mudstone and tuff are outcropping as one unit.