Main features of STAV-2D
The conceptual model of STAV-2D is based on the shallow-water equations, featuring dynamic bed geometries and sediment transport. Morphological changes are modeled with a conservation equation of bed material, via an imbalance between capacity bedload discharge and local solid discharge. This conceptual model is closed in terms of flow resistance, capacity bedload discharge and a specific return-to-capacity parameter by a modified closure model originally proposed by Ferreira (2009).
The discretization technique is based on the Finite Volume approach and provides fully conservative solutions to initial and boundary value problems. The model further features a consistent wetting-drying algorithm, entropy conditions to ensure shocks are effectively captured and a revised Courant condition. The discretization method allows body-fitting unstructured triangular mesh, optimizing the computational workload, using larger cells where flow gradients are expected to be mild and finer cells in specified areas where gradients are presumably larger.
A Lagrangian module for the explicit tracking of large debris was recently introduced.
STAV-2D is being applied to simulate tsunami scenarios on key locations of the Portuguese coast. The later include a thorough analysis of tsunami exposure in the Tagus estuary(move link to new page), in cooperation with the Civil Protection services of Lisbon, and the exposure of the Port of Sines (move link to new page)to debris induced hazards in case of a tsunami impact. Other applications include the flash-floods at Madeira(move link to new page) Island and a dam-break scenario in the Zambezi river.(move link to new page)