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Environmental Geology

, Volume 53, Issue 7, pp 1563–1569 | Cite as

The influence of rainstorm pattern on shallow landslide

  • Tung-Lin Tsai
Original Article

Abstract

In this study, the influence of the rainstorm pattern on shallow landslide is examined. The physically-based shallow landslide model is used to conduct this examination with considering four representative rainstorm patterns including uniform, advanced, central, and delayed rainstorms. The results show that in spite of the rainfall duration and the rainfall pattern, the rainstorm with less than the minimum landslide-triggering rainfall amount will not trigger landslide. However, for the rainstorm with greater than the minimum landslide-triggering rainfall amount, the occurrence of landslide significantly depends not only on the rainfall duration but also on the rainfall pattern. Among the four representative rainstorm patterns, the delayed rainstorm has the greatest rainfall duration threshold for landslide occurrence, followed by the central rainstorm, and then the uniform rainstorm. In addition, for each rainstorm pattern, the corresponding rainfall duration threshold for landslide occurrence decreases with the increase of rainfall amount, and seems to be constant for large rainfall amount.

Keywords

Landslide Rainstorm pattern Infiltration Slope stability 

List of symbols

C

the change in volumetric water content per unit change in pressure head

C0

the minimum value of C

c

soil cohesion

D0

\({K_{{\rm sat}} } \mathord{\left/ {\vphantom {{K_{{\rm sat}} } {C_{0} }}} \right. \kern-\nulldelimiterspace} {C_{0} }\)

dZ

water depth

dLZ

slope depth

FS

factor of safety

IZ

rainfall intensity

Ksat

saturated hydraulic conductivity

T

rainfall duration

Z

the coordinates

ψ

groundwater pressure head

θ

soil volumetric water content

α

slope angle

φ

soil friction angle

γsat and γw

the unit weights of saturated soil and water

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Department of Civil and Water Resources EngineeringNational Chiayi UniversityChiayi CityTaiwan

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