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| Titel |
Two dimensional modelling of flood flows and suspended sedimenttransport: the case of the Brenta River, Veneto (Italy) |
| VerfasserIn |
P. Martini, L. Carniello, C. Avanzi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 4, no. 1 ; Nr. 4, no. 1 (2004-03-09), S.165-181 |
| Datensatznummer |
250001475
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| Publikation (Nr.) |
 copernicus.org/nhess-4-165-2004.pdf |
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| Zusammenfassung |
| The paper presents a numerical model for the simulation of flood waves
and suspended sediment transport in a lowland river basin of North Eastern Italy.
The two dimensional depth integrated momentum and continuity equations are modified
to take into account the bottom irregularities that strongly affect the hydrodynamics
in partially dry areas, as for example, in the first stages of an inundation process
or in tidal flow. The set of equations are solved with a standard Galerkin finite
element method using a semi-implicit numerical scheme where the effects of both
the small channel network and the regulation devices on the flood wave propagation are accounted for.
Transport of suspended sediment and bed evolution are coupled with
the hydrodynamics using an appropriate form of the advection-dispersion
equation and Exner's equation.
Applications to a case study are presented in which the effects of
extreme flooding on the Brenta River (Italy) are examined. Urban and rural
flood risk areas are identified and the effects of a alleviating action based
on a diversion channel flowing into Venice Lagoon are simulated. The results
show that this solution strongly reduces the flood risk in the downstream
areas and can provide an important source of sediment for the Venice Lagoon.
Finally, preliminary results of the sediment dispersion due to currents and
waves in the Venice Lagoon are presented. |
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