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Critical rainfall to trigger landslides in Cunha River basin, southern Brazil

Author

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  • Gean Michel
  • Roberto Goerl
  • Masato Kobiyama

Abstract

In 2008, Rio dos Cedros city in Santa Catarina State, Brazil, suffered from numerous landslides. The objective of the present study was, therefore, to apply the slope stability model SHALSTAB to the Cunha River basin, which is located in this city, and to estimate the rainfall necessary to trigger the landslides, which is defined as critical rainfall. Some geotechnical parameters were determined through field survey and laboratory test. The slope stability map elaborated with SHALSTAB was compared to the landslide inventory map, which confirmed the good performance of this model for the study area. In the model calibration, the values of the hydrologic ratio (q/T), which is the steady-state recharge (q) per transmissivity (T), were determined in order to rearrange the classification of the slope stability–instability conditions. After determining these values, the q value which is equivalent to the critical rainfall was estimated. Based on the rainfall time series data from 1941 to 2011, the critical rainfall was determined 1,042.55 mm in 68 days, equivalent to a steady-state recharge of 15.33 mm/day. This result implies that landslides in Rio dos Cedros city in 2008 were triggered by an association between intense rainfall and a long rainy period. Copyright Springer Science+Business Media Dordrecht 2015

Suggested Citation

  • Gean Michel & Roberto Goerl & Masato Kobiyama, 2015. "Critical rainfall to trigger landslides in Cunha River basin, southern Brazil," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 75(3), pages 2369-2384, February.
    • Handle: RePEc:spr:nathaz:v:75:y:2015:i:3:p:2369-2384
    DOI: 10.1007/s11069-014-1435-6
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