Abstract

BUCOGEN, Grethel Garcia Bu; PICCOLO, Maria Cintia  and  BOHN, Vanesa Yael. Estimate of susceptibility to floods in the lower basin of río negro, Argentina. Finisterra [online]. 2021, n.118, pp.53-72.  Epub Dec 01, 2021. ISSN 0430-5027.  https://doi.org/10.18055/finis21647.

The objective of the article is to estimate the susceptibility to flooding due to river overflow, taking into account average meteorological conditions, based on the study of geomorphological, hydrographic and edaphic variables. The study region is located in the lower section of the Río Negro basin (Argentina). The zoning of the study area, according to its susceptibility to flooding, is the result of a Multicriteria Evaluation (MCE), which is carried out using the weighted sum of variables and based on criteria published in the national and international bibliography. The physical variables analyzed were maximum water extension, land cover, order, drainage and soil texture, topographic slope and geomorphology of the area. These are integrated into a Geographic Information System (GIS). The data used correspond to the databases of the National Geographic Institute of the Argentine Republic (IGN), the National Institute of Agricultural Technology (INTA) and previously published databases. The results categorize 46,7% (1 321,6km2) of the studied territory with low or medium susceptibility. The city of Viedma and the towns of Zanjón de Oyuela, La Boca and Primera Angostura correspond to areas highly susceptible to flooding. It was determined that the occurrence of floods is more significant in areas with topographic slopes of 1% and poor soil drainage. The results show agreement with historical flood events in the area

Keywords : Susceptibility; floods; zoning; Multi-criteria Evaluation; Argentina.

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