Flood Hazard Mapping in Alluvial Fans with Computational Modeling

Sofia Melo Vasconcellos (), Masato Kobiyama, Fernanda Stachowski Dagostin, Claudia Weber Corseuil and Vinicius Santana Castiglio
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Sofia Melo Vasconcellos: Federal University of Rio Grande do Sul
Masato Kobiyama: Federal University of Rio Grande do Sul
Fernanda Stachowski Dagostin: Federal University of Santa Catarina
Claudia Weber Corseuil: Federal University of Santa Catarina
Vinicius Santana Castiglio: Federal University of Rio Grande do Sul

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2021, vol. 35, issue 5, No 5, 1463-1478

Abstract: Abstract Floods occurring in alluvial fans are very peculiar and hazardous, due to the mobility of the channel in the regions. Such mobility increases the uncertainty of the course to be occupied by the water or the debris flow, which makes hazard mapping more complex. Since the flow in alluvial fans is three-dimensional, the flood mapping in these regions without hydrological data can be unfeasible. Then, at first the present study applied to the Upper Mampituba river basin characterized with three main alluvial fans (Molha Coco and Malacara Fans (MCMFs) and Boi Fan), southern Brazil, three models: Hydrological Engineering Center – River Analysis System 2D (HEC-RAS), FAN Model and Height Above The Nearest Drainage (HAND). The FAN and HAND models are considered geomorphological models and comparatively simpler. Then the combination between these two models was applied to generate flood hazard maps. The proposed combination model presented results more coherent with alluvial fan feature, representing satisfactorily the flood extent of the most recent event occurred in the study area (showing good performance metrics: statistical F (%) 72.65, General Accuracy (%) 79.82, FIT(%) 38.44 and False Alarm Rate (%) 20.50).

Keywords: Alluvial fan; Flood hazard index; HEC-RAS 2D; HAND; FAN (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11269-021-02794-7

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