Examinando por Autor "Rodríguez, José F."
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Ítem Acceso Abierto Macquarie River floodplain flow modeling: implications for ecogeomorphology(International Association for Hydro-Environment Engineering and Research (IAHR), 2014-09-03) Sandi Rojas, S.G.; Rodríguez, José F.; Saco, Patricia; Riccardi, Gerardo A.; Wen, L.; Saintilan, N.; Stenta, Hernán; Trivisonno, F.; Basile, Pedro A.; International Association for Hydro-Environment Engineering and Research (IAHR)This work presents preliminary results of implementing a quasi-2D hydrodynamic module (VMMHH 1.0) to simulate flows and flooding patterns throughout the Macquarie Marshes, south east Australia, in order to assess habitat requirements. The model uses an interconnected cell scheme that solves mass conservation and uses simplified versions of the momentum equations to represent flow between cells. This model has been used before to assess geo-morphological changes in large river floodplains and vegetation evolution in estuarine wetlands, showing results con-sistent with cases of gradual floodplain inundation following overbank flow. The simplified characteristics of the quasi-2D model allow for an adequate representation of hydrodynamic processes with similar performance of other higher dimensional models. Model results and computational times are compared with outputs from a conventional 1D/2D model (MIKE FLOOD) applied to the same domain showing that the VMMHH 1.0 is adequate for representation of floods in the Macquarie Marshes.Ítem Acceso Abierto Modelación matemática hidro-morfodinámica a escala de cuenca en ríos con lechos de sedimentos no-uniformes(Universidad Nacional de Rosario. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Centro Universitario Rosario de Investigaciones Hidroambientales., 2016) Basile, Pedro A.; Riccardi, Gerardo; Rodríguez, José F.Ítem Acceso Abierto Modelling Hydrodynamic and Sedimentation Processes in Large Lowland Rivers: An Application to the Paraná River (Argentina)(2013-09) Garcia, Marina; Basile, Pedro A.; Riccardi, Gerardo Adrián; Rodríguez, José F.; International Association for Hydro-Environment Engineering and ResearchIn the last decade 1D, 2D and 3D numerical models have been extensively used to simulate river-floodplain hydraulics and sediment deposition processes in floodplains. Large river-floodplain ecosystems in lowland areas show characteristic reach lengths of the order of hundred of kilometers, floodplain widths of the order of tens of kilometers and river widths of the order of a few kilometers. The floodplain itself shows also a very complex geomorphology. Computationally intensive water flow and sediment transport models cannot take into account these peculiarities, and particularly the large time and space scales involved. On one hand, 1D models are not appropriated because the one-dimensional flow description is not representative of the complex flow pattern; on the other hand, higher dimensionality models, even if they can provide the necessary level of processes representation at small spatial scales, cannot be applied over large time and space scales due to the computational demands. An alternative to high resolution models is the implementation of quasi-2D models which can capture the fundamental characteristic of water flow and sediment dynamics in those situations. Thus, a compromise between computational costs and processes representation can be achieved. In this work a quasi-2D model, suitable for the time-dependent water and sediment transport processes simulation in large lowland river systems, including their floodplain, is presented. Water flow and sediment equations are represented by means of the interconnected irregular cells scheme. Different simplifications of 1D Saint Venant equations are used to represent the discharge laws between fluvial cells. Spatially-distributed transport and deposition of fine sediments throughout the river-floodplain system are simulated. The model is applied over a 208 km reach of the Paraná River between the cities of Diamante and Ramallo (Argentina) and involving a river-floodplain area of 8100 km². After calibration and validation, the model is applied to predict water and sediment dynamics during synthetically generated extraordinary floods of 100, 1000 and 10000 years return period. The potential impact of a 56 km long road embankment constructed across the entire floodplain was simulated. Results with and without the road embankment shows that upstream water levels, inundation extent, flow duration and sediment deposition increases in the presence of the embankment.Ítem Acceso Abierto Modelling the effects of human disturbances on the flow and sediment dynamics of a large river floodplain(2015-04-12) Garcia, Marina; Basile, Pedro A.; Riccardi, Gerardo A.; Rodríguez, José F.; European Geosciences Union (EGU) General Assembly 2015The flow and sediment dynamics of large river floodplains can be substantially affected by human disturbances like bridges and embankments. These effects are difficult to predict, mainly due to extent of the domain over which they can be important. In this contribution we present the application of a quasi-2D unsteady flow and sediment transport model of a large lowland river system, including its floodplain. We study the potential impact of a 56-km long road embankment constructed across the entire floodplain. The study area comprises a 208-km reach of the Paraná River between the cities of Diamante and Ramallo (Argentina) representing total a river-floodplain area of 8,100 km2. The model uses an unstructured cells scheme to solve the water flow and sediment equations, relying on different simplifications of the 1D de Saint Venant equations to define the discharge laws between cells. The simulations allow for the analysis of the spatially-distributed transport and deposition of fine sediments throughout the river-floodplain and the backwater effects introduced by the structures. These dynamic changes are quantified for different extraordinary flood events.