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Influence of land use and land cover datasets on dam-break modeling in the semiarid region of Brazil

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  • Sérgio Ricardo Toledo Salgado

    (Faculty of Engineering of the University of Porto (FEUP)
    Interdisciplinary Centre of Marine and Environmental Research of the University of Porto (CIIMAR)
    Brazilian National Water and Sanitation Agency)

  • Elsa Carvalho

    (Faculty of Engineering of the University of Porto (FEUP)
    Interdisciplinary Centre of Marine and Environmental Research of the University of Porto (CIIMAR))

  • Maria Teresa Viseu

    (National Laboratory of Civil Engineering (LNEC))

  • Othon Fialho Oliveira

    (Brazilian National Water and Sanitation Agency)

Abstract

Accurate estimation of Manning’s roughness coefficient is critical for reliable hydraulic modeling of dam-break floods. However, for this type of accident, the lack of historical flood data makes the definition of Manning’s roughness coefficient challenging. This study utilizes high-resolution land use and land cover (LULC) data to determine Manning’s roughness coefficient values for application in dam-breaking studies. This study assesses the influence of a regional high-resolution LULC dataset (MapBiomas) and two high-resolution LULC datasets (Dynamic World and ESRI 10 m Annual) on hydraulic parameters related to flood wave propagation and flood hazard assessment. The simulations indicated substantial variations in flood behavior across the Dynamic World generated predominant regions with elevated Manning values, resulting in expanded flood zones and heightened flow attenuation simulations. Conversely, the ESRI 10 m Annual exhibited predominant regions of lower roughness, leading to simulations with diminished flood areas, reduced propagation times, and decreased attenuation of peak flows. Compared with the other LULC datasets, MapBiomas demonstrated a balanced representation of the Manning coefficient’s domains and yielded intermediate outcomes. These discrepancies highlight the challenges associated with accurately determining Manning’s values to ensure precise outcomes in flood modeling. The quality of this modeling is critical for identifying risks, formulating emergency responses, and implementing effective mitigation strategies in downstream regions.

Suggested Citation

  • Sérgio Ricardo Toledo Salgado & Elsa Carvalho & Maria Teresa Viseu & Othon Fialho Oliveira, 2025. "Influence of land use and land cover datasets on dam-break modeling in the semiarid region of Brazil," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 121(15), pages 18295-18319, August.
    • Handle: RePEc:spr:nathaz:v:121:y:2025:i:15:d:10.1007_s11069-025-07517-4
    DOI: 10.1007/s11069-025-07517-4
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    References listed on IDEAS

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    1. G. Papaioannou & A. Loukas & L. Vasiliades & G. T. Aronica, 2016. "Flood inundation mapping sensitivity to riverine spatial resolution and modelling approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 83(1), pages 117-132, October.
    2. Emrah Yalcin, 2020. "Assessing the impact of topography and land cover data resolutions on two-dimensional HEC-RAS hydrodynamic model simulations for urban flood hazard analysis," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 101(3), pages 995-1017, April.
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