FLOOD RISK INDEX MAPPING OF AN AREA DOWNSTREAM OF A DAM IN CASE OF A BREAK

Authors

DOI:

https://doi.org/10.4215/rm2023.e22004

Abstract

We aimed to evaluate the flood risk index due to the hypothetical break of the São Bento dam (SC, Brazil). The risk index was obtained by combining the hazard and vulnerability indices. The hazard index was obtained by multiplying the velocity by the depth of the water, simulated with HEC-RAS 2D. The simulated flood extent was 64.8 km2, with a maximum flow of 3586.60 m3·s-1, a depth of up to 2.0 m, and a velocity of up to 2.0 m·s-1 in most of the area. The formation of the breach occurred in 2.85 h, and the peak flow occurred at 1.67 h. The volume that overflowed with the break was 44.75 hm3. The flood wave reached 22.0 km in length, where the municipality of Forquilhinha is located. The risk index map showed that the risk is high up to 6 km from the dam since most people were at least 60 years old and had low incomes. In this location, the people were not safe inside buildings because they had a high probability of being destroyed. Thus, risk mapping may be adopted as a preventive measure to assist in preparing an emergency action plan and serve for environmental education and territorial planning.

Keywords: Dam Break; HEC-RAS 2D; Risk Mapping.

Author Biographies

  • Francisco Moreira Alves Junior, Federal University of Santa Catarina, Araranguá (SC), Brazil

    Master's student in the Graduate Program in Energy and Sustainability at the Federal University of Santa Catarina - UFSC. Works in the area of civil engineering with design, consultancy and reinforcement of reinforced concrete structures, structural masonry, concrete walls and metallic structures.

  • Masato Kobiyama, Federal University of Rio Grande do Sul, Porto Alegre (RS), Brazil.

    PhD in Forest Engineering from the Federal University of Paraná (1994). He worked in Ghana from 1985-1987 as a volunteer in the service of JOCV / JICA. As a professor, he worked at the Federal University of Paraná (UFPR) from 1996 to 2002, and at the Federal University of Santa Catarina (UFSC) from 2002 to 2013. Federal do Rio Grande do Sul (UFRGS) and substitute coordinator of the Research Group on Natural Disasters (GPDEN) at IPH-UFRGS. His professional interest is: natural disasters, water balance, riparian zone, monitoring, and school basins. His personal interests are: football, marathon (and São Silvestre), music, dance, SUDOKU, and zen buddhism.

  • Cláudia Weber Corseuil, Federal University of Santa Catarina, Araranguá (SC), Brazil

    PhD in Agronomy (Energy in Agriculture) from the Paulista State University Júlio de Mesquita Filho (UNESP/Botucatu). She is currently Associate Professor 2 at the Federal University of Santa Catarina. He has experience in the area of Environmental and Energy Engineering, with an emphasis on Water Resources, working mainly on the following topics: hydrology, geographic information system, hydrological modeling and remote sensing.

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Published

2023-04-25

Issue

Vol. 22 (2023)

Section

Artigos

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