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標題: 九九峰震災崩塌地植生復育之評估
Assessment of Vegetation Recovery for the Ninety-nine Peak Landslides Caused by Earthquake
作者: 吳瑞鵬
Wu, Jui-Pen
關鍵字: 植生復育;vegetation recovery;衛星影像;地理資訊系統;常態化差異植生指標;921大地震;Satellite images;Geographic Information System;GIS;Normalized Difference Vegetation Index;NDVI;921 earthquake
出版社: 水土保持學系
Large-scale landslides, caused by the catastrophic 921 earthquake, occurred at the Ninety-nine Peaks of Wu-Chi basin. Areas of denudation are estimated to 908.96ha and are urgent to be restored for the secondary disaster prevention in the rainy season. Satellite images and digital terrain models were used to process the vegetation index analysis for identifying landslide sites and to extract topographic information of the areas. A system coupled with GIS developed in this research could be used to monitor and/or assess the recovery rate of vegetation for the landslides.
The distribution of landslides is obviously affected by the direction of quake's shaking, the most distribution of landslides are located at the range of aspect from northeast to west counterclockwise and in the steep slopes (greater than 55%). Results show that after a year of 921 earthquake, the average rate of vegetation recovery for the landslides in the Ninety-nine peak areas is over 40% under the circumstance of natural succession. It's worth to observe and discuss if we need to throw massive human and material resources into the vegetation recovery of the landslides.
Large amounts of sediment yield usually derived from the lack of vegetative coverage of the slopelands in a watershed, hence sediment yield can be the index of priority for the watershed management. Watershed #4, #6, #8, and #12 with the considerable amount of erosion depth should be list at the high rank of treatment priority. The sites of summit are susceptible to landslide due to the quake. From the viewpoint of sediment delivery ratio, the riparian zones are the suitable places for landslide revegetation to decrease the sediment yield and control disaster economically.

坡面植生覆蓋之變化,可反映集水區之泥砂產量,若以泥砂產量為集水區崩塌地治理優先順序之指標,編號 4、6、8及12號等集水區,因其於地震後坡面沖蝕明顯增大,宜列為優先治理之對象。試區崩塌區位分析結果,顯示921地震所誘發之崩塌地多位於坡頂,以遞移率之觀點而言,植生復育區位應以河道之濱水帶為主,利用濱水區植生緩衝帶之建置可有效攔阻泥砂進入河道,能達經濟防災之目的。
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