国际泥沙研究：英文版, 2015, Vol.30 (2), p.150-159
2015
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- Autor(en) / Beteiligte
- Titel
- Modelling extraordinary floods and sedimentological processes in a large channel-floodplain system of the Lower Parana River （Argentina）
- Ist Teil von
- 国际泥沙研究：英文版, 2015, Vol.30 (2), p.150-159
- Erscheinungsjahr
- 2015
- Quelle
- Alma/SFX Local Collection
- Beschreibungen/Notizen
- A quasi-2D unsteady flow and sediment transport model suitable for the simulation of large lowland river systems, including their floodplains, is presented. The water flow and sediment equations are discretised using an interconnected irregular cells scheme, in which different simplifications of the 1D de Saint Venant equations are used to define the discharge laws between 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 Paran~ River between the cities of Diamante and Ramallo （Argentina） comprising 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 10,000 years return period. The potential impact of a 56-km long road embankment constructed across the entire floodplain is simulated and compared to model results without the embankment. The embankment results in increases in upstream water levels, inundation extent, flow duration, and sediment deposition.