Banking stability evaluation along the Vomano river (Teramo – central Italy), by 3D numerical modelling ABSTRACT: This job deal with the banking system evolution along the Vomano river (Teramo province in Abruzzo Region). Due to river deepening the riverbed is characterized from banking instability. Embankments, nearly vertical, with over ten meters high escarpment, are withdrawing constantly due to the decreasing of clay borders caused by stream. The focused area is composed by a clay substratum highly engraved appearing along the main part of the river, and from alluvial cover. Morphology is continuously modified. In order to get the right assessment of the present situation a topographic survey has been realized by the use of GPS (Global Positioning System) a powerful tool which permits quick surveys, high performances and working simplicity. The survey has been realized using the equipment Trimble Total Station 5700, on mode RTK, which guaranteed an appropriate precision for the riverbeds. The obtained data, bearing the topographic area, has been elaborated according several software concerning the construction of geometric model. Physical-mechanical feature of lithotypes obtained from lab analysis, have been used to get physic model. This model has been finally discretized in order to figure out the correct value of the volume involved in the embankment instability. Furthermore, to achieve the purpose to analyse the cinematic evolution was employed a three dimensional finite difference numerical code. Key terms: GPS, banking instability, 3D modelling, Abruzzi region Termini chiave: GPS, instabilità spondale, modellazione numerica, regione Abruzzo
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