题名

以光達數值高程模型產製地形相關山崩潛感因子之最適量測尺度

并列篇名

Optimun Measurement Scale for Producing Topography-Related Landslide Susceptibility Factors Using LiDAR Dem

DOI

10.6653/MoCICHE.202310_50(5).0010

作者

李錫堤;張瓊文;謝有忠;林錫宏

关键词

山崩潛感模型 ; 潛感因子 ; 最適量測尺度 ; Landslide susceptibility model ; Susceptibility factor ; Optimal measurement scale

期刊名称

土木水利

卷期/出版年月

50卷5期(2023 / 10 / 01)

页次

65 - 77

内容语文

繁體中文;英文

中文摘要

本研究於曾文水庫上游集水區選取四期颱風降雨事件之誘發山崩目錄,以平滑化移動視窗法及大核心網格法,進行山崩潛感因子之最適量測尺度研究。透過一系列不同大小的核心計算地形因子數值,並以成功率曲線法評估各因子不同尺度之效度,曲線下面積最大者視為最適尺度。再以最適尺度因子建置四組事件型山崩潛感模型,並交叉驗證計算彼此間的預測率。結果顯示最適因子模型的成功率及預測率,較之以3 × 3核心所計算因子建立的原始模型,都有明顯的增長情形。這充分顯示了採用最適量測尺度計算地形因子的重要性及必要性。

英文摘要

A test area was selected at the catchment of the Zengwen Reservoir in southwestern Taiwan. Four event landslide inventories, which were mapped from high-resolution satellite images before and after rain events, are selected for study. Susceptibility factors were analyzed by using the moving window smoothing method and large kernel grid method, with a series of kernels in different sizes for comparison. In addition, success-rate curve method was used to evaluate the effectiveness of each factor in interpreting landslide distribution. Highest AUC is selected as the most effective one and the kernel size which yield that is the optimal measurement scale of the factor. Factors calculated from an optimal measurement scale are selected for construction of a landslide susceptibility model. Totally, four models are constructed. These models are validated individually, and cross-validated each other. The success rates and prediction rates of these optimal models are significantly increasing as compared with the model built from conventional 3 × 3 kernel calculated factors. Finally, this optimal susceptibility model was used to construct a landslide hazard model for prediction of landslide distribution under different triggering events. This fully demonstrates the importance and necessity of using the optimal measurement scale to calculate topographic-related factors.

主题分类 工程學 > 土木與建築工程
工程學 > 水利工程
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