Stato di avanzamento delle attività del progetto VALCON

In many mountainous contexts, the increasing urbanization and the limited availability of bottom of the valley areas have favored building expansion in zones potentially prone to hydraulic phenomena typical of alpine environments. This makes a rigorous and systematic risk assessment, aimed at supporting appropriate urban planning tools. Defining risk requires characterizing the hazard, and therefore this study aims to develop a workflow for its determination. The workflow is divided into two phases: 1) identification of the mountain hydraulic process (catchment–fan data sheet) and the definition of volumes available for homogeneous segments of the hydrographic network, and 2) physically based modeling. The first phase integrates field surveys, photo-interpretation analyses, and geomorphometric analyses with the goal of estimating the sediment volumes available and mobilizable in the catchment during hydraulic events typical of mountainous environments. These volumes are then used as inputs in hydraulic simulations for hazard delineation. The study area is located in Lombardy, more precisely in Camonica Valley, and includes four catchments situated in different parts of the valley (lower, middle, and upper valley), whose different geological and geomorphological conditions influence the mountain hydraulic phenomenon characterizing each catchment. This study presents the results of applying the workflow to the Figna and Supine catchments. It provides to estimate sediment volumes available along the hydrographic network for homogeneous segments for ordinary and extraordinary conditions (e.g., landslide or check-dam collapse). The correspondence between GIS-based results and field surveys is emphasized, highlighting the potential of these tools when properly applied with a critical evaluation of the results.