Shallow landslides triggered by strong rainfall represent a widespread geological hazard impacting natural and anthropic environments. The study of geological and hydrological features of soil represents an essential task in understanding the slope behaviour when struck by heavy rainfall, significantly when the presence of man-made terraces modifies the regularity of the relief. To address this purpose, a multi-sensor monitoring system has been operating in the Monterosso al Mare catchment (Liguria region, Italy) since 2018, acquiring both hydrological parameters and weather conditions. The data acquired in this way were interpreted based on the engineering geological model obtained starting from the field investigations to point out the hydro-mechanical characterisation of terraced soils and to evaluate their hydrological behaviour. The first results suggest how the coarse-grained grain size distribution favours the infiltration of meteoric water, inducing sharp changes in soil moisture and pore water pressure and highlighting seasonal trends. The preliminary outcomes provide valuable insights into the evolution of hydrological factors in the slope, laying the groundwork for a better understanding of the time-dependent processes that guide water circulation in terraced systems and the triggering conditions to landsliding.
Hydrological field monitoring and geotechnical characterisation of terraced slope prone-to-landslide: the case study of Cinque Terre (Italy)
Matteo Fiorucci
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2024-01-01
Abstract
Shallow landslides triggered by strong rainfall represent a widespread geological hazard impacting natural and anthropic environments. The study of geological and hydrological features of soil represents an essential task in understanding the slope behaviour when struck by heavy rainfall, significantly when the presence of man-made terraces modifies the regularity of the relief. To address this purpose, a multi-sensor monitoring system has been operating in the Monterosso al Mare catchment (Liguria region, Italy) since 2018, acquiring both hydrological parameters and weather conditions. The data acquired in this way were interpreted based on the engineering geological model obtained starting from the field investigations to point out the hydro-mechanical characterisation of terraced soils and to evaluate their hydrological behaviour. The first results suggest how the coarse-grained grain size distribution favours the infiltration of meteoric water, inducing sharp changes in soil moisture and pore water pressure and highlighting seasonal trends. The preliminary outcomes provide valuable insights into the evolution of hydrological factors in the slope, laying the groundwork for a better understanding of the time-dependent processes that guide water circulation in terraced systems and the triggering conditions to landsliding.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
