Volume 12 Issue 1
Mar.  2019
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Juan Pinos, Luis Timbe. 2019: Performance assessment of two-dimensional hydraulic models for generation of flood inundation maps in mountain river basins. Water Science and Engineering, 12(1): 11-18. doi: 10.1016/j.wse.2019.03.001
Citation: Juan Pinos, Luis Timbe. 2019: Performance assessment of two-dimensional hydraulic models for generation of flood inundation maps in mountain river basins. Water Science and Engineering, 12(1): 11-18. doi: 10.1016/j.wse.2019.03.001

Performance assessment of two-dimensional hydraulic models for generation of flood inundation maps in mountain river basins

doi: 10.1016/j.wse.2019.03.001
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  • Corresponding author: Juan Pinos
  • Received Date: 2018-06-13
  • Rev Recd Date: 2019-01-03
  • Hydraulic models for the generation of ?ood inundation maps are not commonly applied in mountain river basins because of the dif?culty in modeling the hydraulic behavior and the complex topography. This paper presents a comparative analysis of the performance of four twodimensional hydraulic models (HEC-RAS 2D, Iber 2D, Flood Modeller 2D, and PCSWMM 2D) with respect to the generation of ?ood inundation maps. The study area covers a 5-km reach of the Santa Barbara River located in the Ecuadorian Andes, at 2330 masl, in Gualaceo. The model's performance was evaluated based on the water surface elevation and ?ood extent, in terms of the mean absolute difference and measure of ?t. The analysis revealed that, for a given case, Iber 2D has the best performance in simulating the water level and inundation for ?ood events with 20- and 50-year return periods, respectively, followed by Flood Modeller 2D, HEC-RAS 2D, and PCSWMM 2D in terms of their performance. Grid resolution, the way in which hydraulic structures are mimicked, the model code, and the default value of the parameters are considered the main sources of prediction uncertainty.

     

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