Traditionally flood risk assessments have been developed from one-dimensional models, which are capable of calculating flood levels and discharges quite accurately in applications where the flow path is mainly linear. In fact, physical phenomena involved in the process of describing exchanges of flows with the floodplains make this procedure questionable in urban areas, where the flow paths are usually complex. More recently 2D models have been introduced to overcome these problems. In this study we discuss the capability of one-dimensional modeling (HEC-RAS v.4.0) and compare simulation results with those from a two-dimensional finite element model (River 2D), in order to determine the strengths and weaknesses of the different approaches. These practical implications are analyzed and illustrated on a case study on the terminal reach of the River Pescara, Italy. The results of this study can provide useful information in determining which tool to use and which aspects to consider in order to make more reliable analyses of flooding processes in urban areas.

"Comparison of a 1D and a 2D Hydraulic Model in Flood Risk Assessment"

LEOPARDI, Maurizio;SCORZINI A.
2011-01-01

Abstract

Traditionally flood risk assessments have been developed from one-dimensional models, which are capable of calculating flood levels and discharges quite accurately in applications where the flow path is mainly linear. In fact, physical phenomena involved in the process of describing exchanges of flows with the floodplains make this procedure questionable in urban areas, where the flow paths are usually complex. More recently 2D models have been introduced to overcome these problems. In this study we discuss the capability of one-dimensional modeling (HEC-RAS v.4.0) and compare simulation results with those from a two-dimensional finite element model (River 2D), in order to determine the strengths and weaknesses of the different approaches. These practical implications are analyzed and illustrated on a case study on the terminal reach of the River Pescara, Italy. The results of this study can provide useful information in determining which tool to use and which aspects to consider in order to make more reliable analyses of flooding processes in urban areas.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/31231
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