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題名 | 應用光達地形資料於莫拉克災後陳有蘭溪流域崩塌與土石流地質敏感地區判釋與分析=Application of LiDAR Data on Identifications of Landslides and Debris Flow Geologically Sensitive Area of the Chen-Yo-Lan River Basin Post Typhoon Morakot |
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作者 | 林美聆; 陳彥澄; Lin, Meei-ling; Chen, Yen-chen; |
期刊 | 航測及遙測學刊 |
出版日期 | 20140500 |
卷期 | 18:2 2014.05[民103.05] |
頁次 | 頁129-144 |
分類號 | 440.98 |
語文 | chi |
關鍵詞 | 崩塌及土石流地質敏感地區; 光達地形資料; 航空照片; 陳有蘭溪流域; 莫拉克颱風; Landslide and debris flow geological sensitive aera; LiDAR; Aerial photos; Chen-Yo-Lan river basin; Typhoon Morakot; |
中文摘要 | 台灣位處環太平洋地震帶,板塊運動活躍、地勢陡峭,地質構造複雜破碎提供了豐富的土石材料。季節性颱風豪雨帶來了豐沛的雨量,導致台灣地區崩塌和土石流災害頻傳。崩塌和土石流地質敏感區域常以航空照片或衛星影像進行判釋,但往往因為地形地貌、日照方向、雲覆或植被之影響導致判釋上的困難。目前高精度光達探測技術日益發展,本研究透過航空照片以及衛星影像及光達日照陰影圖,判釋研究區域崩塌及土石流等地質敏感區域。將光達資料所判釋的成果與航照及衛星影像之圈繪成果比對,並討論光達地形資料在崩塌和土石流之判釋適用性。 利用光達數值地形判釋時可以排除航照及衛星影像的不利因素,可以更精確的判釋大規模崩塌及土石流。光達數值地形所判釋的崩塌規模較大並可看出整體性,而且判釋不受植被影響。利用光達數值地形判釋土石流時,能得到河道的正確位置,土石流沖積扇也能輕易的判釋,但對於小規模及淺層崩塌則難以判釋。 |
英文摘要 | Taiwan is located on the circum-Pacific seismic zone, the active tectonic actions, steep terrain, and geological structures provide abundant debris material. The seasonal typhoons with heavy rainfall often cause landslides and debris flow .The aerial photos or satellite images are often used for interpretation of landslides, debris flow, and other geohazards, but the results are affected by topography, shades, cloud cover, and vegetation. With the development of high resolution LiDAR technique, this study uses aerial photos and satellite images as well as LiDAR shading map for identification of landslides and debris flow. Comparisons of the results from LiDAR shading maps and aerial photos are made, and differences of the interpretation results are discussed. Using LiDAR for interpretation of landslides and debris flow provides accurately large-scale landslides identifications of and can exclude unfavorable factors in using aerial photos or satellite images. The landslides interpreted by LiDAR are mostly large-scale landslides. By LiDAR also provides good results of debris flows interpretation along with river channels, and alluvial fan. However, the small-scale landslides are difficult to identify using LiDAR shading map. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。