Influences of soil water characteristic curve on rainfall-induced shallow landslides |
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| Authors: | Tung-Lin Tsai |
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| Institution: | (1) Department of Civil and Water Resources Engineering, National Chiayi University, 300 Sefu Road, Chiayi City, 60004, Taiwan |
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| Abstract: | The analysis of slope instability induced by rainfall was usually performed using the main drying curve as the measurement
of the main wetting curve is a more time-consuming and costly task. In this study, the influences of the main drying and wetting
curves on rainfall-induced shallow landslides are examined. Three designed scenarios and a real case scenario are used to
conduct this examination. The prediction of shallow landslide occurrence is related to the main drying and wetting curves
due to the strong relation between groundwater pressure head and hysteresis effect. The main wetting curve may have a less
minimum landslide-triggering rainfall amount and a less rainfall duration threshold for landslide occurrence than the drying
wetting curve. For safety’s sake, an underestimation of shallow landslide occurrence may be produced by the commonly used
main drying curve. In addition, besides the shallow landslide occurrence, the failure depth and the time to failure are also
influenced by the main drying and wetting curves. The hysteresis effect should be taken into account for assessing rainfall-induced
shallow landslides. |
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