Integration of HEC-RAS and HEC-HMS with GIS in Flood Modeling and Flood Hazard Mapping

İsmail Bilal Peker, Sezar Gülbaz, Vahdettin Demir (), Osman Orhan and Neslihan Beden ()
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İsmail Bilal Peker: Department of Civil Engineering, Istanbul University-Cerrahpaşa, Avcılar, Istanbul 34320, Türkiye
Sezar Gülbaz: Department of Civil Engineering, Istanbul University-Cerrahpaşa, Avcılar, Istanbul 34320, Türkiye
Vahdettin Demir: Department of Civil Engineering, KTO Karatay University, Konya 42020, Türkiye
Osman Orhan: Department of Geomatic Engineering, Mersin University, Mersin 33110, Türkiye
Neslihan Beden: Department of Meteorological Engineering, Özdemir Bayraktar Faculty of Aeronautics and Astronautics, University of Samsun, Samsun 55000, Türkiye

Sustainability, 2024, vol. 16, issue 3, 1-18

Abstract: Floods are among the most devastating disasters in terms of socio-economics and casualties. However, these natural disasters can be managed and their effects can be minimized by flood modeling performed before the occurrence of a flood. In this study, flood modeling was developed for the Göksu River Basin, Mersin, Türkiye. Flood hazard and risk maps were prepared by using GIS, HEC-RAS, and HEC-HMS. In hydraulic modeling, Manning’s n values were obtained from 2018 CORINE data, return period flow rates (Q25, Q50, Q100, Q500) were obtained from HEC-HMS, and the application was carried out on a 5 m resolution digital surface model. In the study area, the water depths could reach up to 10 m, and water speeds were approximately 0.7 m/s. Considering these values and the fact that the study area is an urban area, hazard maps were obtained according to the UK Department for Environment, Food and Rural Affairs (DEFRA) method. The results indicated that possible flood flow rates from Q25 to Q500, from 1191.7 m 3 /s to 1888.3 m 3 /s, were detected in the study area with HEC-HMS. Flooding also occurred under conditions of the Q25 flow rate (from 4288 km 2 to 5767 km 2 ), and the impacted areas were classified as extremely risky by the DEFRA method.

Keywords: HEC-HMS; HEC-RAS; Göksu River Basin; flood modeling; flood hazard (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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