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福建地质GeologyofFujian
运用历史航照及地形图建置数值地形资料
并探讨1941年草岭山崩之地形演育
1941 Tasolinglandsideanalysis based on aerial
增刊1
photos,topographic map and the associated DEM data
陈柔妃1,2张国桢3詹瑜璋2郭志禹
（1.中国文化大学地质系，台北，11114;2.中央研究院地球科学研究所，台北，11529； 3.台北科技大学土木系，台北，10608;4.中央研究院应用科学研究中心，台北，11529
In tectonically active mountain belts such as the Taiwan (Fig.la), frequent landslides affect the stability of mountain slopes,and landslides favour river erosion of disrupted masses. lIn the climatic and geodynamic context of Taiwan with heavy rainfall, approximate typhoon frequency of 3 5 per year [1-2] , rapid uplift of ~5-10 mm yr-1[3-] and strong denudation rate ([5-7), Landslides are among the most common earthquake induced secondary effects and are causing huge damage to settlements,infrastructure and human life worldwideThe study of theTsaoling landslide suggests that the long retention times of sediment and the volume of debris supplied by landslide during the earthquake is the principal sediment-supply mechanism from an active mountain belt.
Earthquakes and heavy rainfall were the major causes of Tsaoling area (Fig. 1b), the historical catastrophic dip slope failures have repeatedly occurred (Table 1). Based on a number of studies from detailed landslide [8), as are well known for understand the effort of earthquake and rainfall, and to determine the short-term processes of excessive previous event [9). This has necessitated a strong retrospective and empirical approach to systematically document the distribution, characteristics and their geomorphic effects following historic events, with a strong focus on the analysis of past events.Traditionally，to obtain the information of topographic changes after a landslide event, ground surveying or aerial photogrammetric surveys are conducted.
Aerial photographs are advantageous for landslide studies in Taiwan because they have suitable spatial resolution and have been in existence after 1999 Chi-Chi earthquake [1o), A few studies, principally in detailed observations of earthquake-triggered landslides have surveyed before 1970's In this study, we analyzed the co-seismic topographical change during 1941 Chungpu earthquake and also analyzed the post-seismic topographical change The three datasets used in this study were (1) the DEM with 5 m accuracy derived in 1921 from topographic map refers to the situation before the 1941 event, (2) the DEM with 5 m grid accuracy derived from 1945 aerial photographs after the
收稿日期：2010-08-20
作者简介：陈柔妃(1974-)，女，助理教授，长期从事新期构造与河流地形研究、宇宙成因核索技术与阶地光年、地表侵蚀作
用研究。万方数据