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FLOOD HAZARD MAPPING USING TWO-DIMENSIONAL HYDRAULIC MODELING RESULTS
Abstract
Floods are one of the deadliest natural disasters in the world. According to the World Meteorological Organization (WMO), this is a consequence of the increasing frequency of heavy precipitation, changes in upstream land use, and a continuously increasing concentration of population and assets in flood-prone areas [1]. For this reason, flood prevention, and protection are a growing priority these days. Flood hazard mapping is a state-of-the-art tool for decision-makers and stakeholders when it comes to flood protection and Flood Risk Management Plans. The visualization of the various parameters (range, depths, velocities, etc.) of a flood event gives a clear vision for implementing measures that help to protect and restore the natural functions of rivers and floodplains. This article presents the different types of flood hazard maps - with either a single parameter or a combination of several parameters (range, depths, velocities, and combination of flow velocity and flow depth. For this purpose, results obtained from 2D modeling with the software product HEC-RAS were used. The digital terrain model used was provided by Drone and has a resolution of 0.05 cm. Land cover information from CLC 2018 was used to determine the Manning coefficients. According to Art. 146e. of the Water Act (New, SG No. 61/2010) [2], several scenarios should be considered for Bulgaria: low-probability floods, medium-probability floods, and high-probability floods. As a result, a number of maps with different probabilities of flood occurrence and different flood parameters were obtained. These maps were used to analyze and assess potential damage in the different flood scenarios and parameters.
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References3
https://public.wmo.int/en/resources/world-meteorological-day/previous-worldmeteorological-days/climate-and-water/floods
Water Act (New, SG No. 61/2010)
Balabanova, Sn., Stoyanova, V. 'SIMULATING FLASH FLOODS IN URBAN AREAS USING TWO-DIMENSIONAL HYDRAULIC MODEL' International Multidisciplinary Scientific GeoConference: SGEM, 2021 DOI: 10.5593/sgem2021/3.1/s12.38
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