Abstract

SALAZAR-BRIONES, Carlos et al. Hydrological and hydraulic modeling of an intra-urban river in a transboundary basin using a regional frequency analysis. Tecnol. cienc. agua [online]. 2018, vol.9, n.4, pp.48-74.  Epub Nov 24, 2020. ISSN 2007-2422.  https://doi.org/10.24850/j-tyca-2018-04-03.

Floods are among the most recurrent and devastating natural hazards, affecting human lives and causing severe economic damage worldwide. Arid and semi-arid regions are particularly vulnerable to intense storm events over short time periods resulting in flashfloods. These regions represent approximately 30% of the world's area and are inhabited by approximately 20% of the total population. The main objective of this study was to estimate the design storm for return periods of 20, 50, 100, and 500 years, in the semi-arid region of the New River sub-basin, in order to determine the flood areas in the main channel. In this study, an integrated model approach was proposed, consisting of developing a hydrological model for different return periods and performing a regional frequency analysis (RFA) using the L-Moments approach, in order to generate the input for hydrological and hydraulic modeling using the programs HEC-HMS and HEC-RAS. The flood areas obtained ranged from 190.55 ha to 237.83 ha, and depths from 0.10 to 6 meters, which pose a risk to the urban infrastructure of the city. The outcome of this research provides information that can be used by urban planners to reduce flood risks.

Keywords : Flood areas; design storm; regional frequency analysis; L-moments; HEC-HMS; HEC-RAS; SIG; simulation.

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