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中国台湾地区位处亚热带地区,夏季受台风暴雨侵袭,加上位处板块运动活跃处,造成地形变化较大,尤其在台风暴雨后河道地形都会产生很大的变化;目前航空激光雷达地形数据,分辨率较高、精度、便利性,并可以滤除建筑物与树木遮蔽,还原原始地面形貌,符合地质与地形分析研究的需要。2008年兰阳溪地区经历海鸥(KALMAEGI)、凤凰(FUNG-WONG)、森拉克(SINLAKU)、蔷薇(JANGMI)等4次重大台风事件,河床地形变化甚剧,因此本研究利用两次航空激光雷达测量地形数据,分析比较台风前后河床地形以及河道输沙的变化。研究成果首次展示空载激光雷达系统,在大流域面积测量河道地形应用效果显著,于台风季节前后产制不同时期的数值地形数据,并应用高程差值的地形计量方法,计算在台风季节前后河道地形的变化,研究结果显示空载激光雷达高解析数值地形模型数据,应用在河道地形变迁与沉积物体积变化量计算,可以得到极佳的成果。
Taiwan region is located in the subtropical region, the summer typhoon storm hit, together with active in plate movement, resulting in greater terrain changes, especially in typhoon after the river terrain will have a great change; the current aerial lidar topographic data, resolution High rate of accuracy and convenience, and can filter out the buildings and trees shelter, restore the original ground topography, in line with geological and topographic analysis and research needs. In 2008, Lan Yangxi experienced four major typhoon events including KALMAEGI, FUNG-WONG, SINLAKU and JANGMI, and the terrain of the riverbed changed dramatically. Therefore, two aeronautical lasers Radar measured the terrain data, analyzed and compared the typhoon bed topography and river sediment transport changes. The results of this study show the no-load lidar system for the first time. The results of river topography measurement in the catchment area are significant. The numerical terrain data at different periods before and after the typhoon season are produced, and the topography of the river course before and after the typhoon season The results show that the high resolution numerical terrain model data of no-load lidar can be used to calculate the change of river topography and volume of sediment, and the excellent results can be obtained.