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Discussion papers | Copyright
https://doi.org/10.5194/nhess-2018-212
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Aug 2018

Research article | 15 Aug 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Delimitation of Flood Areas Based on Calibrated DEM and Geoprocessing: Case Study on Uruguay River, Itaqui City, Southern Brazil

Paulo Victor N. Araújo1,2, Venerando E. Amaro1, Robert M. Silva3, and Alexandre B. Lopes4 Paulo Victor N. Araújo et al.
  • 1Postgraduate Program in Geodynamics and Geophysics (PPGG), Department of Geology, Federal University of Rio Grande do Norte, Natal-RN, P.O. Box 1524, Zip Code 59078-970, Brazil
  • 2Federal Institute of Education, Science and Technology of Rio Grande do Norte, Macau-RN, Zip Code 59500-000, Brazil
  • 3Federal University of Pampa, Itaqui-RS, Zip Code 96650-000, Brazil
  • 4Center of Sea Studies, Federal University of Parana, Paraná-PR, P.O. Box 61, Zip Code 83255-976, Brazil

Abstract. Flooding is a natural disaster which affects thousands of riversides, coastal and/or urban communities causing severe damages. River flood mapping is the process of determining inundation extents and depth by comparing historic river water levels with ground surface elevation referenced. This paper aims to map flood geohazard areas under the influence of the Uruguay River, Itaqui city (Southern Brazil), using calibration Digital Elevation Model (DEM), historic river level data and Geoprocessing techniques. The annual maximum for years of 1942 to 2017, of fluviometric temporal series records of Uruguay River were linked to Brazilian Geodetic System using geometric levelling and submitted the statistical analysis. The DEM was calibrated with Ground Control Points (GCP) of high vertical accuracy based on post-processed high-precision GNSS surveys. Using the temporal series statistical analysis results, was assessed the spatialisation of flood hazard classes on the calibrated DEM and validated. Finally, was visually compared the modelling of the simulated flood level versus flood area on satellite image, which both were registered on the same date. The free DEM calibration model indicated high correspondence with GCPs (R2=0.81; p<0.001). The calibrated DEM showed a 68.15% improvement in vertical accuracy (RMSE=1.00m). Were determinate 5 classes of flood hazards: extremely high flood hazard; high flood hazard; moderate flood hazard; low flood hazard; and non-floodable. The flood episodes with return time of 100 years were modelled with 57.24m altimetric level. Altimetric levels above 51.66m have high potential of damaging, mainly affecting properties and public facilities in the city northern and western peripheries. The assessment of the areas that can potentially be flooded can help to reduce the negative impact of flood events by supporting the process of land use planning in areas exposed to flood geohazard.

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This paper aims to map flood geohazard areas under the influence of the Uruguay River, Itaqui city (Southern Brazil), using calibration Digital Elevation Model (DEM), historic river level data and Geoprocessing techniques. The assessment of the areas that can potentially be flooded can help to reduce the negative impact of flood events by supporting the process of land use planning in areas exposed to flood geohazard.
This paper aims to map flood geohazard areas under the influence of the Uruguay River, Itaqui...
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