Interactions between groundwater conditions and climatic actions in the Pisciolo hill slope
Tutor / director / evaluatorVaunat, Jean
Document typeMaster thesis
Rights accessOpen Access
The tectonically active chain of southern Apennines (Italy) represents an area in which the slow landsliding is widespread, the outcropping clayey soils are highly disturbed, fissured and full in rock inclusions, as result of an intense long-lasting tectonics. The landslide activity can be classified as deep and as slow to very slow (Cruden & Varnes 1996) and may be due to changes of the boundary and/or loading conditions. This is the context of the Pisciolo hill (Melfi, south Italy), subject of the present study. The slope is affected by a failure mechanism giving rise to an active and complex landslide process that produces several damages to the important infrastructures in the surrounding, such as an aqueduct pipeline, a national road and a local railway, prompting a comprehensive investigation and monitoring of the slope features and processes. The recent developments of investigation field suggest that the behavior of these fissured soils is highly influenced by hydraulic dynamics also down to large depths, reducing even further the material strengths and causing periodic accelerations of landslides. The aim of this work is to obtain a correct valuation of processes of slope-atmosphere interaction and the prediction of evapo-transpiration flow, including not only geotechnical features but also atmospheric conditions of Pisciolo hill-slope through the use of Code-bright. The program allows to model thermo-hydro-mechanical (THM) processes in a coupled way in geological media.The first chapter outlines the geological and the geotechnical model of the slope created through the field investigations, along with the reconstruction of the slope history and the analysis of the collected data. The interaction of the slope with the atmosphere occurs through the shallow soils, whose fundamental features are shown in the second chapter .The third chapter includes the metheorological data to be assigned to the upper edge of the model and that Code-bright requires in order to represent the temporal variation of atmospheric conditions that control the inflow or the outflow in the media. The fourth chapter discuss the procedure followed to built the one-dimensional elements with the use of the preprocessing code GID, and then analyzed by Code-Bright. The geometry and the activated laws allow to focus on the hydro-thermic answer of the model. The last chapter shows the results obtained with the code. These are investigated in order to comprehend the weight of the features used to describe the model in the analysis. A comparison with the collected data is led to find similarities and differences respect the behaviour of the site.