遙測技術於溪頭地區崩塌裸露地變遷分析與植生覆蓋回復監測之研究

Using Remote Sensing Technique to Monitor Landslide Changes and Vegetation Cover Recovery in Sitou Area

邱祈榮(Chyi-Rong Chiou) ； 王亞男(Ya-Nan Wang) ； 黃兆吟(Chao-Yin Huang) ； 賴彥任(Yen-Jen Lai)

《中華林學季刊》 40卷3期 (2007/09) Pp. 301-318

https://doi.org/10.30064/QJCF.200709.0002

摘要

本研究旨在利用不同遙測影像，針對台大實驗林溪頭營林區所轄約2,475 ha林地，進行崩塌裸露地植生覆蓋回復的監測。首先利用1994至2004年期間的正射航照影像及SPOT衛星影像，判釋並建置出各年度的崩塌裸露地分布圖，透過各年度崩塌裸露地的套疊，可以得出11年間各地崩塌裸露發生的頻度，在11年間，以1996年賀伯颱風、1999年921地震及2001年桃芝颱風所造成的新增崩塌裸露地面積最多；同時透過新舊崩塌裸露地的變遷分析，可以得知賀伯颱風與921地震所造成的崩塌裸露地，有關連的僅約20％的面積，而921地震與桃芝颱風的崩塌裸露地有高達52％的面積是有關連，由此可證實桃芝颱風的崩塌裸露地，確實與921地震有緊密的關聯；最後，利用各年度的崩塌裸露地分布圖監測全區及因賀伯颱風、921地震及桃芝颱風所造成崩塌裸露地的植生覆蓋回復情形，結果顯示每次災害發生確實會影響一些已經有植生回復區域的再度裸露，也分析出當災害發生裸露時，若無其他二次傷害發生時，在三年之內其植生覆蓋回復率均可達到80％以上。

關鍵字

地理資訊系統 ； 植生覆蓋回復 ； 遙測技術

並列摘要

We applied remote sensing technologies to monitor the vegetation recovery at landslide areas in Sitou tract, the Experimental Forest of National Taiwan University. First of all, the ortho-images and SPOT satellite imagines from 1994 to 2004 were interpreted and the delineated distribution maps of landslide area over time. The frequency of landslide occurrence in 11 years was detected through overlay analysis. The landslide areas increased the most when swept successively by Typhoon Herb in 1996, the 921 earthquake in 1999, and Typhoon Toraji in 2001. Then, through change analysis of the new and old landslide areas, only 20% of the landslide areas interpreted after 921 earthquake was related to Typhoon Herb. However, up to 52% was related to 921 earthquake, and Typhoon Toraji. This study verified that the landslide caused by Typhoon Toraji was closely related to the 921 earthquake. Finally, the landslide distribution maps were employed to detect the vegetation recovery rate of the whole landslide areas, caused by Typhoon Herb, the 921 earthquake, and Typhoon Toraji. Results showed that each time the disturbance happened, the areas which already had previous landslide would be likely to lead to be barren again. If there was no further disturbance after landslide, the vegetation recovery ratio could reach over 80%.

並列關鍵字

Geographic information system (GIS) ； Remote sensing ； Vegetation cover recovery