Articles | Volume 11, issue 4
Nat. Hazards Earth Syst. Sci., 11, 1141–1151, 2011
https://doi.org/10.5194/nhess-11-1141-2011

Special issue: Geo-hydrological risk and town and country planning

Nat. Hazards Earth Syst. Sci., 11, 1141–1151, 2011
https://doi.org/10.5194/nhess-11-1141-2011

Research article 21 Apr 2011

Research article | 21 Apr 2011

An approach for flood hazard modelling and mapping in the medium Valtellina

I. Poretti and M. De Amicis I. Poretti and M. De Amicis
  • University of Milano-Bicocca, Dept. of Environmental and Territorial Sciences, Piazza della Scienza 1, 20126 Milan, Italy

Abstract. In the Lombardy Region, as in many other contexts all over the world, hazard maps do not have a precise legislative confirmation. Despite this, they are necessary to support several institutional activities, and among these, local urban planning. An approach to hazard analysis and mapping that fits the Lombardy Region legislative framework is presented here that introduces a level of experimental modelling, making use of SOBEK 1-D–2-D as a tool for hydrodynamic simulations. A stretch of 17 km of the Adda river in Valtellina has been modelled, referring to twelve scenarios characterised by different temporal probabilities, and comprising the main sources of uncertainty. The results were compared with available local hydraulic studies, and combined to obtain two complementary flood hazard maps which could usefully support urban planning. Advantages and drawbacks of this modelling approach, together with considerations related to flood hazard mapping are discussed.

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