On 24-26th January 2003 a heavy storm struck the Central-South-Eastern sector of Italian peninsula. Thousands of shallow landslides occurred along hilly areas, generally characterised by “rapid” shallow short movements which ceased after displacement of few metres. Also some previous quite deep seated landslides were reactivated. Return period of cumulative rainfall that as induced these landslide was estimated using Gumbel distribution function. The maximum return period values was over 100 years. All shallow landslides occurred during or immediately after the storm, most likely caused by positive pore pressure development in surficial strata. The effect of the storm has been probably increased by the fact that the storm occurred after a wet period which most likely caused the reaching of field capacity of the soil. After the storm were recorded some continuous rainy days during which previous quite deep landslides were reactivated. The “delay” of these landslides can be explained as a longer time needed for water to infiltrate inducing critical condition.
|Titolo:||Analysis of rainfall in landslide activation during January-February 2003 in Central-South-Eastern Italy|
|Data di pubblicazione:||2004|
|Nome del convegno:||Conference on Water Observation and Information System for Decision Support|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|