Scientific literature reports a plethora of numerical tools of different complexity (e.g. 1D, 2D raster-based or full 2D models) for flood hazard and flood risk evaluation. The correct identification of the appropriate model still represents a key aspect in the overall flood hazard process even though the potentialities of these modelling instruments are emphasized by the availability of high computational resources and by the amount of high-resolution topographic data provided by recent survey techniques. In this context the present analysis investigates the effects of minor drainage networks on the estimation of flood hazard in a flood-prone area along the Enza river, close to the village of Sorbolo a Levante (RE, Northern Italy). By means of a full 2D hydraulic model (Telemac-2D), the effects of the drainage system is analyzed using three unstructured meshes with different degrees of complexity: 1) the minor drainage system allows the possibility to convey water outside the study area (REF); 2) the drainage system is reproduced only in terms of preferential flow-paths (REF-noFlow); 3) the drainage network is completely neglected (REF-noDN). The analysis points out that the maximum flood extent seems not to be influenced by the mesh schematization while water depths and the total volume are significantly related to the model schematization. Even if this analysis refers to a specific case study and further investigations are needed, it shows the fundamental role of the drainage network in controlling water depth distribution and the duration of the inundation, which should be accurately reproduced by numerical models.

Alessio Domeneghetti (2014). Effects of minor drainage networks on flood hazard evaluation. Göttingen : Copernicus Publ. [10.5194/piahs-364-192-2014].

Effects of minor drainage networks on flood hazard evaluation

DOMENEGHETTI, ALESSIO
2014

Abstract

Scientific literature reports a plethora of numerical tools of different complexity (e.g. 1D, 2D raster-based or full 2D models) for flood hazard and flood risk evaluation. The correct identification of the appropriate model still represents a key aspect in the overall flood hazard process even though the potentialities of these modelling instruments are emphasized by the availability of high computational resources and by the amount of high-resolution topographic data provided by recent survey techniques. In this context the present analysis investigates the effects of minor drainage networks on the estimation of flood hazard in a flood-prone area along the Enza river, close to the village of Sorbolo a Levante (RE, Northern Italy). By means of a full 2D hydraulic model (Telemac-2D), the effects of the drainage system is analyzed using three unstructured meshes with different degrees of complexity: 1) the minor drainage system allows the possibility to convey water outside the study area (REF); 2) the drainage system is reproduced only in terms of preferential flow-paths (REF-noFlow); 3) the drainage network is completely neglected (REF-noDN). The analysis points out that the maximum flood extent seems not to be influenced by the mesh schematization while water depths and the total volume are significantly related to the model schematization. Even if this analysis refers to a specific case study and further investigations are needed, it shows the fundamental role of the drainage network in controlling water depth distribution and the duration of the inundation, which should be accurately reproduced by numerical models.
2014
Proceedings of ICWRS2014
192
197
Alessio Domeneghetti (2014). Effects of minor drainage networks on flood hazard evaluation. Göttingen : Copernicus Publ. [10.5194/piahs-364-192-2014].
Alessio Domeneghetti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/291916
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