Please use this identifier to cite or link to this item:
Investigation of Change Detection on Landslide Characteristic-Appling Six Stage Images of Ching-Shui Stream Watershed as An Example
|關鍵字:||Landslide Chang Characteristic|
Image Subtraction Method
The geological condition of Taiwan is bad, and the frequent earthquake and typhoon's torrential rain often make disasters like landslide and mudflow. The disasters has increase year by year. It threateneshe safity people's lives and country's important economic construction increasingly. In this study, we collect six images at the watershed of Ching-Shui stream since 1999 to 2004 at first. Secondly, using NDVI and Image subtraction method to get the scope of primary landslide, then cut the shadow through topographic effect and the riverside range at every period of images. Finally, using the grid computing of GIS to compute the change of landslide at every images. This way can get five periodes of landslide changed characteristics since 921 earthquake to this day speedily. Using five periodes of landslide to overlay the landform layers included height, slope, aspect, geology, river and road. From this way, we can understand the characteristics of landslide and vegetation restoration at the Ching-Shui stream since 921 earthquake to this day. In this study, we found some results ad following: 1. For landslide area: The most elevation of landslide is at 400~700 meters, and most slope grade is at 6th. The most aspect of landslide is at SW, and the main rock stratus of landslide is Cs and Nc. Road and river has more influence for landslide which was torrential rain type. (2)For vegetation restoration area: The most elevation of vegetation restoration is lower than 400 meters, and most slope grade is at 6th. The most aspect of vegetation restoration is at SE, S and SW. There is no specific trend for vegetation restoration sites' rock stratus. There is more close to water system more large vegetation restoration area, but road's influence is small relatively.
|Appears in Collections:||水土保持學系|
Show full item record
TAIR Related Article
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.