期刊名称：International Journal of Environment and Geoinformatics
电子版ISSN：2148-9173
出版年度：2020
卷号：7
期号：3
页码：239-251
DOI：10.30897/ijegeo.740963
语种：English
出版社：IJEGEO
摘要：Rockfall is one of the most dangerous hazards in mountainous and hilly areas. In this study,rockfall characteristics of the Kazıklıali Gorge (0.25 km2 ) in the lower Emli River Basin located in the SW part of the Aladağlar Mountains was investigated using unmanned air vehicle (UAV) technology and rockfall modeling. To determine rockfall properties,an orthophoto and digital surface model which have a 3 cm resolution were created using UAV images. Then,whole fallen blocks more than 0.5 m in diameter were digitized as polygons in GIS. As a result,10,348 fallen rocks were determined in Kazıklıali Gorge. Via these polygons,density maps were created and frequency distributions were calculated. According to the spatial distribution of density,the geomorphological characteristics of the canyon affect the rockfall density. While the upper and middle parts of the canyon which are the narrowest have high density,the lower part of the valley which is the largest part has low density. The results of 3D rockfall analysis show that the maximum kinetic energy,maximum jump height and maximum velocity reaches 1400 kJ,15 m and 32 m/s on the canyon walls, respectively. The upper and middle parts of the canyon walls which correspond to high rockfall density have maximum kinetic energy,rock jump height and rock velocity.
关键词：Rockfalls;Unmanned air vehicle (UAV);Orthophoto;Digital Elevation Model (DEM);Morphometric properties
