標題: Modeling of rainfall-triggered shallow landslide
作者: Tsai, TL
Yang, JC
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;rainfall;infiltration;slope stability
公開日期: 1-Jul-2006
摘要: By integrating hydrological modeling with the infinite slope stability analysis, a rainfall-triggered shallow landslide model was developed by Iverson (Water Resour Res 36:1897-1910, 2000). In Iverson's model, the infiltration capacity is assumed to be equivalent to the saturated hydraulic conductivity for finding pressure heads analytically. However, for general infiltration process, the infiltration capacity should vary with time during the period of rain, and the infiltration rate is significantly related to the variable infiltration capacity. To avoid the unrealistically high pressure heads, Iverson employed the beta-line correction by specifying that the simulated pressure heads cannot exceed those given by the beta line. In this study, the suitability of constant infiltration capacity together with the beta-line correction for hydrological modeling and landslide modeling of hillslope subjected to a rainfall is examined. By amending the boundary condition at ground surface of hillslope in Iverson's model, the modified Iverson's model with considering general infiltration process is developed to conduct this examination. The results show that the unrealistically high pressure heads from Iverson's model occur due to the overestimation of infiltration rate induced from the assumption that the infiltration capacity is identical to the saturated hydraulic conductivity. Considering with the general infiltration process, the modified Iverson's model gives acceptable results. In addition, even though the beta-line correction is applied, the Iverson's model still produces greater simulated pressure heads and overestimates soil failure potential as compared with the modified Iverson's model. Therefore, for assessing rainfall-triggered shallow landslide, the use of constant infiltration capacity together with the beta-line correction needs to be replaced by the consideration of general infiltration process.
URI: http://dx.doi.org/10.1007/s00254-006-0229-x
http://hdl.handle.net/11536/12052
ISSN: 0943-0105
DOI: 10.1007/s00254-006-0229-x
期刊: ENVIRONMENTAL GEOLOGY
Volume: 50
Issue: 4
起始頁: 525
結束頁: 534
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