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標題: Landslide Mapping and Geomorphologic Change Based on a Sky-View Factor and Local Relief Model: A Case Study in Hongye Village, Taitung
天空開闊度與局部立體模型於山崩判釋及地形變異評估: 以台東縣紅葉村為例
作者: Ching-Fang Lee
Ting-Chi Tsao
Wei-Kai Huang
Sheng-Chi Lin
Hsiao-Yuan Yin
關鍵字: landslide;geomorphometric analysis;SVF relief map;local relief model;UAV;山崩;地形計測學;天空開闊度;局部立體模型;無人機
Project: 中華水土保持, Volume 49, Issue 1, Page(s) 27-39.
This study integrates pre-landslide high-resolution digital elevation model (DEM), digital surface model (DSM) produced using post-landslide drone photography, and geomorphometric analysis to explore the effectiveness of landslide interpretation and fast assessment of geomorphic change. In this study, the large-scale landslide that occurred in Hongye Village, Taitung County in Eastern Taiwan, on September 15, 2016, was investigated. We combined both the microtopography features from the DEM and canopy openness in the DSM to establish an assessment procedure for landslide hotspot extraction. Drone photography and three-dimensional modeling techniques were used to measure the sediment transportation process and conduct postdisaster influence area mapping. The results showed that the landslide area, mean sliding depth, and volume of the landslide in Hongye Village were approximately 4.5 ha, 5.1 m, and 22.8·104 m3, respectively. The runout distance of the initial landslide was 960 m and increased to 1.23 km when the landslide transformed into debris flow in the village. Field validation indicated that the landslideprone area and subsidence features on the forest canopy could be recognized using a sky-view factor relief and local relief model. Moreover, a complete landslide susceptibility assessment approach suitable for the catchment scale is presented.

本研究結合山崩災前高精度數值地型與災後無人機攝影測量技術產製之地表數值模型,以地形計 測學常用之立體陰影圖,探討集水區內山崩判釋可行性及災後快速地貌變遷評估。本文以 2016 年 9 月 15 日 莫蘭蒂颱風誘發臺東縣延平鄉紅葉村山崩為例,萃取災前 DEM 山崩微地形判釋及 DSM 樹冠開闊度特徵,以 建立潛在山崩發生區判釋評估分析流程。另應用災後無人機拍攝影像之三維建模,配合災後地貌可研析山崩 土砂運移歷程及土石流影響範圍。地形變異分析顯示紅葉村崩塌區面積約 4.5 公頃,平均崩滑深度 5.1 公尺, 總崩塌量體約 22.8 萬立方公尺,山崩運移距離約為 957 公尺,轉化為土石流之總流動距離達 1.23 公里。由現 場調查與災後三維地形之驗證,崩塌邊界及林冠陷落特徵可於災前分別透過天空開闊度立體圖及局部立體模 型圖予以判釋。本研究最後提出適於潛在土砂災害識別之地形計測學指標與災害潛勢評估建議。
Appears in Collections:第49卷 第01期

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