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以1996年、2002年、2005年及2007年四期SPOT卫星影像为材料,配合相关图籍数字化台湾花莲地区寿丰溪集水区与秀姑峦溪集水区的崩塌地图层,透过植生回复率(VRR)、新增崩塌率(ICR)及崩塌地重心位移的计算,探讨这两个集水区崩塌地变迁情形,并分析其环境因子特性.研究结果显示:利用多期卫星影像数据可有效进行崩塌地长期监测,并获知其变动情形;另突发暴雨可使崩塌大量发生,显为事件直接影响因子;而VRR、ICR与重心位移的计算,可有效量化植生恢复情形及新增崩塌状况;至于地理环境特征方面,崩塌发生概率随高程增加而增加,也与坡度呈正相关,因此未来在开发上应特别留意.
Based on the SPOT satellite images of 1996, 2002, 2005 and 2007, the map of the collapsed land of Shoufengxi catchment area and Sau Gulluan catchment area in Hualien, Taiwan was digitized according to relevant map data. Through the phytoplankton recovery VRR, ICR and center-of-gravity displacements of the collapsed lands were calculated to investigate the changes of the collapsed lands in the two catchment areas and to analyze the characteristics of environmental factors.The results show that using the multi-period satellite imagery data Effective long-term monitoring of the collapse and informed of its changes; another sudden heavy rainfall can collapse occurred in large numbers, as the direct impact of events; and VRR, ICR and center of gravity displacement calculation, can effectively quantify the recovery of vegetation and the new collapse As for the characteristics of the geographical environment, the probability of collapse increases with the increase of elevation, and also with the slope is positively correlated, so in the future should pay special attention to the development.