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A comparative analysis was performed of three 1-D river hydrodynamic models (Mike 11, InfoWorks-RS and HEC-RAS) in a quasi 2-D setting. The study area was schematized either as a network of fictitious river branches or as storage areas. The models were run on a reduced area of the Dender River basin in Belgium, respectively for three historical flood events and eight synthetic events with a return period between 1 and 1000 years. The performance of the models were tested comparing simulated discharge, water level, inundation volume and inundated area. Results show that the three models and the two approaches used for the presentation of the floodplain lead to very similar results with a root mean square error of around 6 cm for the peak river levels and 2% for the river discharges. Despite the high accuracy of the water levels in the main river, inundation levels inside the floodplains have root mean square errors of around 25 cm during flood conditions. Keywords: 1-D hydrodynamic models, quasi 2-D approach, floodplain modeling, hypsographic curve. RESUMEN En este estudio se realizo un analisis comparativo de tres modelos hidrodinamicos de rios 1-D (Mike 11, InfoWorks-RS y HEC-RAS) con una configuracion cuasi 2-D. La planicie de inundacion fue esquematizada mediante una red de ramales ficticios o como areas de almacenamiento. Los modelos se evaluaron en un area reducida de la cuenca del rio Dender en Belgica, para lo cual se simularon tres eventos de inundacion historicos y ocho eventos sinteticos con periodos de retorno entre 1 y 1000 anos, respectivamente. La eficiencia de los modelos se cuantifico comparando los valores simulados de caudal, nivel de la superficie del agua, volumen de inundacion y area inundada. Los resultados muestran que los tres modelos y las dos configuraciones empleadas para la representacion de las planicies aluviales dan resultados muy similares en el cauce principal del rio, con un error cuadratico medio de alrededor de 6 cm para los niveles maximos y 2% para los caudales. A pesar de la alta precision en el cauce, los niveles de crecida en la llanura aluvial tienen un error cuadratico medio mayor, de aproximadamente 25 cm, en condiciones de inundacion. Palabras clave: Modelos hidrodinamicos 1-D, aproximacion cuasi 2-D, modelacion de planicies aluviales, curva hipsometrica.

Comparative analysis of 1-D river flow models applied in a quasi 2-D approach for floodplain inundation prediction