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首页> 外文会议>Asian conference on remote sensing;ACRS >ANALYZING GEOMORPHOLOGICAL CHANGES IN WATERWAY SYSTEM USING LIDAR DATA AND TOPOGRAPHIC SURVEYS
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ANALYZING GEOMORPHOLOGICAL CHANGES IN WATERWAY SYSTEM USING LIDAR DATA AND TOPOGRAPHIC SURVEYS

机译：利用激光数据和地形学调查分析水路系统中的地貌变化

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摘要

In this paper, we analyzed geomorphological changes in waterway systems caused by perennial flooding through a case study utilizing LiDAR derived Digital Terrain Model (DTM) and topographic survey data focusing on Lemon Creek in Butuan City, Agusan del Norte Mindanao, Philippines. This creek is one of the several minor tributaries of Agusan River, the Philippines' third largest river basin. In 2014, two significant flooding events caused by torrential rainfall brought by two tropical storms, namely Agaton (January 2014) and Seniang (December 2014) caused significant changes in the creek's geomorphology. To detect and characterize these changes, we used a LiDAR DTM acquired before 2014 and topographic survey datasets acquired after 2014. The pre-2014 elevations of these random points were extracted from the LiDAR DTM, while the post-2014 elevations were obtained through the topographic surveys. The changes in geomorphology were then analyzed from these datasets using GIS and basic statistical analysis. The analysis revealed significant changes in the creeks geomorphology after the flooding caused by Agaton and Seniang. In majority of the randomly selected points, there was an increase in elevation which was due to sediment accumulation. Results of this study can be used as physical evidence on the effects of flooding in changing a waterway systems' geomorphology, and can be used as basis in developing restoration solutions and better creek management strategies.
机译：在本文中，我们通过案例研究，利用LiDAR派生的数字地形模型（DTM）和以菲律宾阿古桑·德尔丹·丹丹老岛Butuan市柠檬河为中心的地形调查数据，分析了多年生洪水造成的水路系统地貌变化。这条小河是菲律宾第三大流域阿古桑河（Agusan River）的几个次要支流之一。 2014年，由两次热带风暴Agaton（2014年1月）和Seniang（2014年12月）带来的暴雨引起的两次重大洪灾事件使小河的地貌发生了重大变化。为了检测和描述这些变化，我们使用了2014年之前采集的LiDAR DTM和2014年之后采集的地形调查数据集。这些随机点的2014年前海拔是从LiDAR DTM中提取的，而2014年后海拔是通过地形获取的调查。然后使用GIS和基本统计​​分析从这些数据集中分析地貌的变化。分析表明，由阿加顿和塞尼昂造成的洪灾后，小溪的地貌发生了显着变化。在大多数随机选择的地点，由于沉积物的堆积，海拔升高了。这项研究的结果可以作为洪水对改变航道系统地貌的影响的物理证据，也可以作为制定修复方案和更好的小河管理策略的基础。

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