標題: | Discriminant analysis of the geomorphic characteristics and stability of landslide dams |
作者: | Dong, Jia-Jyun Tung, Yu-Hsiang Chen, Chien-Chih Liao, Jyh-Jong Pan, Yii-Wen 土木工程學系 防災與水環境研究中心 Department of Civil Engineering Disaster Prevention and Water Environment Research Center |
關鍵字: | Landslide dam;Stability;Discriminant analysis;Geomorphic variable |
公開日期: | 15-九月-2009 |
摘要: | Landslides can cause the formation of dams, but these dams often fail soon after lake formation. Thus, rapidly evaluating the stability of a landslide dam is crucial for effective hazard mitigation. This study utilizes discriminant analysis based on a Japanese dataset consisting of 43 well documented landslide dams to determine the significant variables, including log-transformed peak flow (or catchment area), and log-transformed dam height, width and length in hierarchical order, which affect the stability of a landslide dam. The high overall prediction power (88.4% of the 43 training cases are correctly classified) and the high cross-validation accuracy (86%) demonstrate the robustness of the proposed discriminant models PHWL (with variables including log-transformed peak flow, and log-transformed dam height, width and length) and AHWL (with variables including log-transformed catchment area, and log-transformed dam height, width and length). Compared to a previously proposed "DBI" index-based graphic approach, the discriminant model AHV - which uses the log-transformed catchment area, dam height, and dam volume as relevant variables - shows better ability to evaluate the stability of landslide dams. Although these discriminant models are established using a Japanese dataset only, the present multivariate statistical approach can be applied for an expanded dataset without any difficulty when more completely documented worldwide landslide-dam data are available. (C) 2009 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.geomorph.2009.04.004 http://hdl.handle.net/11536/6681 |
ISSN: | 0169-555X |
DOI: | 10.1016/j.geomorph.2009.04.004 |
期刊: | GEOMORPHOLOGY |
Volume: | 110 |
Issue: | 3-4 |
起始頁: | 162 |
結束頁: | 171 |
顯示於類別: | 期刊論文 |