| Documento: |
00093 |
| Título: |
Protective measures to reduce the landslide risk in El Salvador: Use of rainfall threshold values for predicting landslides. |
| Autor: |
Norwegian Geotechnical Institute*. |
| Fuente: |
Noruega; NGI; Aug. 20, 2003. 17 p. graf. |
| Descriptores: |
GEOLOGIA. DESLIZAMIENTOS DE TIERRA. INTENSIDAD DE PRECIPITACION. REDUCCION DEL RIESGO DE DESASTRES. PREVENCION DE RIESGOS -------------------------------------------------------------------------------- |
| Resumen: |
The report describes different approaches to use rainfall data as a tool for warning of landslides based on available international literature. The landslides examined are typically shallow debris flows in steep terrain triggered by intense rainfall. To establish statistical correlations between rainfall and triggering of landslides, recordings of historical landslides and rainfall are necessary. The investigations give rise to the following conclusions: There is no formula that is generally applicable for predicting landslides based on rainfall. This because each region has its own characterizes with respect to precipitation pattern and soil cover; On local basis, the use of statistical correlations seems to provide a useful tool, given that the correlations are appropriately validated and updated with available information; Out of the 4 main approaches that have been studied in this report, it is concluded that the most promising approach is to base the critical threshold values by on the following two parameters: rainfall intensity expressed in mm/hour and accumulated precipitation in mm/24 hours or mm/96 hours (Au) - en |
