Determinación de la inundación en tramos de ríos afectados por marea basada en la simulación continúa de nivel

  1. Sopelana, J.
  2. Cea, L.
  3. Ruano, S.
Journal:
Ingeniería del agua

ISSN: 1134-2196

Year of publication: 2017

Volume: 21

Issue: 4

Pages: 231-246

Type: Article

DOI: 10.4995/IA.2017.8770 DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Ingeniería del agua

Abstract

The hydrodynamics of coastal river reaches is complex due to the interaction of several sources of flooding as the astronomical tide, surge, wave set-up and river discharge. The tidal level might affect several km of river reach. In those reaches, the same inundation water level can result from different combinations of the sea level ad river discharge. At the present time, most flood inundation studies in tidal river reaches are based in the application of an arbitrary sea level at the downstream river boundary, without considering the interaction and possible correlations between sea level and river discharge. In Spain, the Guía Metodológica para el Desarrollo del Sistema Nacional de Cartografía de Zonas Inundables (Ministerio de Medio Ambiente y Medio Rural y Marino, 2011), recommends to consider the simultaneous occurrence of a sea level and river discharge associated to the same return period. This approach does not consider the probability of simultaneous occurrence of extreme sea level and river discharge. In order to improve this excessively simple and conservative approach, in this paper we propose a continuous simulation methodology that combines the generation of synthetic long-term time series of river discharge and sea level, 2D inundation modelling at a high spatial resolution and statistical sampling and interpolation techniques. The proposed methodology is applied to the coastal town of Betanzos (NW of Spain), which is classified as a high potential flood risk area by the regional authorities. The town is located at the confluence of two river reaches, in the inner part of Betanzos estuary. The inundation levels obtained with the proposed methodology are compared to those obtained with the standard methodology recommended by the Guía Metodológica para el Desarrollo del Sistema Nacional de Cartografía de Zonas Inundables (Ministerio de Medio Ambiente y Medio Rural y Marino, 2011). Results show that the standard methodology overestimates in a significant way the water levels for a given return period.

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