In land use planning along river path it may be useful to consider a statistic flooding process of the river. The very long return period required from the set of rules regulating land use planning in Italy produces, as a consequence, very high river discharge peaks and no many possibility to have experimental observations. On the contrary it is quite important to give some description of the river flooding process in these critical conditions for a correct land planning. In this situation, a basin scale hydrological model and a robust numerical scheme of the 2D complete form SWE have to be integrated. Knowing that it is very difficult an experimental validation, we showed the reliability of the numerical schemes used to get consistent solutions. A watershed runoff forecast model has been used to obtain the river hydrograph to apply as a boundary condition in the study of the river flood inundation on the flat plane near Olbia airport (Sardinia, Italy). In the wetting-drying process description a threshold of 1 cm, used as a condition to consider or not the cell in the computational field, seems to be well adjusted in the model. The numerical model is quite conservative ensuring water volumes preservation with a precision of 10-4. The great surface water slope in some sections is an evident prove of the SWE inertial terms importance in the wave front propagation. The flow peak loss, during the alluvial plane flooding, gives a reduction of about 10% of the discharge peak at the river mouth. This numerical method, validated in previous similar applications, describes sufficiently well flooding in a complex area with river morphology limited by airport and road infrastructures.

Watershed runoff and river flood modeling in land use planning / Niedda, Marcello; Greppi, M.. - In: JOURNAL OF AGRICULTURAL ENGINEERING. - ISSN 1974-7071. - 2:(2010), pp. 20-28.

Watershed runoff and river flood modeling in land use planning

NIEDDA, Marcello;
2010

Abstract

In land use planning along river path it may be useful to consider a statistic flooding process of the river. The very long return period required from the set of rules regulating land use planning in Italy produces, as a consequence, very high river discharge peaks and no many possibility to have experimental observations. On the contrary it is quite important to give some description of the river flooding process in these critical conditions for a correct land planning. In this situation, a basin scale hydrological model and a robust numerical scheme of the 2D complete form SWE have to be integrated. Knowing that it is very difficult an experimental validation, we showed the reliability of the numerical schemes used to get consistent solutions. A watershed runoff forecast model has been used to obtain the river hydrograph to apply as a boundary condition in the study of the river flood inundation on the flat plane near Olbia airport (Sardinia, Italy). In the wetting-drying process description a threshold of 1 cm, used as a condition to consider or not the cell in the computational field, seems to be well adjusted in the model. The numerical model is quite conservative ensuring water volumes preservation with a precision of 10-4. The great surface water slope in some sections is an evident prove of the SWE inertial terms importance in the wave front propagation. The flow peak loss, during the alluvial plane flooding, gives a reduction of about 10% of the discharge peak at the river mouth. This numerical method, validated in previous similar applications, describes sufficiently well flooding in a complex area with river morphology limited by airport and road infrastructures.
Watershed runoff and river flood modeling in land use planning / Niedda, Marcello; Greppi, M.. - In: JOURNAL OF AGRICULTURAL ENGINEERING. - ISSN 1974-7071. - 2:(2010), pp. 20-28.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/80277
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