Final Document on the Second Year Third Activity : 'Analysis of the Hydrometeorological Chain Performances on a Real Basin'

This report is the final document related to the second year, third activity whose title is: quot;Analysis of the hydrometeorological chain performances on a real basinquot;.The purpose of the collaboration between LAMPIT (Department of Soil Defence, University of Calabria) and CMCC is to develop an hydrometeorological chain in order to obtain a reliable tool in the context of flood evolution prediction able to provide quantitative information of practical importance within the civil protection activities.The LAMPIT contribution to the project concerns the mathematical description of both the generation and propagation of flood events at basin scale. The work here presented has been carried out in close cooperation with CIRA researchers (dr. Pasquale Schiano and dr. Paola Mercogliano). The evaluation in time and magnitude of the overland flow phenomena caused by rainfall is very important in a variety of environmental and hydraulics situations, such as flood predictions, surface erosion, waste water treatment, irrigation and drainage. The mathematical representation of the flow processes is based on the fully dynamic shallow water equations. The solution of these equations, excluding some simplified cases, can be obtained by numerical integration only. Many schemes based on fully dynamic and simplified shallow water equations have been proposed in literature. Some of these schemes are implemented in the LAMPIT laboratory and applied to simulate simple cases of overland flow as already presented in the previous reports. In this period the implemented code has been applied to simulate the surface runoff over a real topography. In literature few articles deal with the simulation of real events and many difficulties are reported in each of them. Indeed the presence of small water depth over high slope and irregular topography may induce numerical anomalies. In this work some numerical techniques have been implemented to prevent these problems. Finally the implemented scheme has been applied to simulate the surface runoff over three different real watersheds.The work has been organized as follows:- Analysis of the models proposed in the technical literature with particular reference to the simulation of real event.- Development and implementation of numerical scheme and techniques - Simulation of overland flow events on real watersheds