應用H.O.S.T地圖判釋土石流潛勢溪流影響範圍地形特徵－以南投縣神木村DF199潛勢溪流為例

Interpretation Terrain Features of Potential Debris Flow Torrent Influence Zone Using H.O.S.T Map-A Case of Potential Debris Flow DF199 in Shenmue Village, Nantou

陳昭岑(Chao-Tsen Chen)；陳振宇(Chen-Yu Chen)；黃奉琦(Feng-Chi Huang)；高百毅(Bai-Yi Kao)；白佩鑫(Pei-Hsin Pai)；林宥伯(Yu-Po Lin)

H.O.S.T地圖 ； 投縣DF199 ； 地形特徵判釋 ； H.O.S.T Maps ； Nantou DF199 ； Interpretation of Terrain Features

水保技術

15卷4期（2021 / 12 / 01）

16 - 27

繁體中文

因受極端氣候影響，如崩塌、地滑及土石流等土砂災害發生頻率與規模增加，且多具有重複性，若能掌握土石流潛勢溪流地形特徵，準確劃定其影響範圍及其保全對象，將能提升後續防減災工作之效能。近年來，國內外許多學者應用高精度、高解析度的數值地形模型產製的圖資於判釋及分析地形地貌，已能掌握各種地形特徵。然而傳統地形圖資受限於判讀者主觀視覺影響，致使各地圖使用者判讀地形特徵時，容易產生落差，且對於一般未經訓練的人而言，不容易直接判讀出地形地貌，並於腦海中無法自動轉換成三維地形。本研究運用具有極佳立體感及可呈現微地形特徵之H.O.S.T地圖進行地形地貌特徵判釋，相較於傳統地形圖資，H.O.S.T地圖更能凸顯豐富的微地形特徵，且讓地圖使用者在室內透過圖資，即可掌握該地區的地形、土石流潛勢溪流之溢流點、影響範圍以及災害型態等資訊，大幅縮減野外調查所耗費的時間。

Due to the influence of extreme weather, the occurrence frequency and scale of the sediment disasters such as slope failure, landslides, debris flows have increased, and are mostly repetitive. If the topographic characteristics of the potential debris flow torrent can be grasped, the scope of their influence can be accurately delimited and determined. It will enhance the effectiveness of subsequent disaster prevention and mitigation work. In recent years, many researchers have used the maps produced by high-precision, high-resolution digital terrain models to interpret and analyze the topography and geomorphology, and they had been able to grasp various topographic features. However, traditional topographic maps are limited by the subjective visual influence of the readers. It is easy to produce a disparity when the map user interprets the topographical features. For the general untrained person, it is not easy to directly command the topographical features and also can't be automatically converted to 3D terrain. H.O.S.T maps with excellent terrain rendering effects are used to interpret topographic characteristics. The results show that compared with traditional topographic maps, H.O.S.T maps can highlight rich micro-topographic features and allow map users to use maps indoors to grasp the topography of the area, the overflow point of the potential debris flow torrent, the influence zone, and the type of disaster, etc., which greatly reduces the time spent on the field.

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