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Title: SIMULATING FLASH FLOODS IN URBAN AREAS USING TWO-DIMENSIONAL HYDRAULIC MODEL
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SIMULATING FLASH FLOODS IN URBAN AREAS USING TWO-DIMENSIONAL HYDRAULIC MODEL
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1314-2704
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English
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21
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3.1
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• Prof. DSc. Oleksandr Trofymchuk, UKRAINE
• Prof. Dr. hab. oec. Baiba Rivza, LATVIA |
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Urban floods, which are most often caused by intensive rainfall and the fast formation of surface runoff, cause great damage to the urban population and infrastructure. Due to the stochastic (random) nature of precipitation, it is not entirely possible to achieve reliable operation of sewer systems. We can only try to design and operate them in the most reliable way. Urbanization and changes in climatic conditions are one of the main factors for increasing the frequency of flash and rain floods in urban conditions. According to the World Meteorological Organization (WMO), flash floods are among the most dangerous natural phenomena with the highest mortality (deaths / affected people) and cause devastating property damage every year. Flash floods modeling are an important tool for forecasting the phenomena and for effective flood mitigation.
Due to the physical characteristics of convective precipitation, the time to forecast flash and rain floods, in a contrast to river floods, is very short. This article presents an approach to modeling flash floods in an urban area. The method is performed using two-dimensional (2D) modeling with HEC-RAS software. The computational mesh for terrain representation is 0.05 m. Detailed terrain data for mesh generation in the 2D model was provided by Drone. Land cover information from CLC 2018 was used to determine the Manning coefficients. A simulation was conducted including main streets and buildings in the area in order to evaluate the influence of streets in the flooding. Two more values of the Manning coefficient were added manually, one for the riverbed and one for buildings and streets. Data from meteorological measurements were used to evaluate the 24 hourly maximum of the rain with probability 5%, 1% and 0.1%. Flood maps from the simulation of 20-, 100- and 1000-year-hyetograph are presented. |
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conference
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21st International Multidisciplinary Scientific GeoConference SGEM 2021
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21st International Multidisciplinary Scientific GeoConference SGEM 2021, 16 - 22 August, 2021
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Proceedings Paper
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STEF92 Technology
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SGEM International Multidisciplinary Scientific GeoConference
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci
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239-246
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16 - 22 August, 2021
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website
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cdrom
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7985
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Hydraulic modeling; HEC-RAS 2D; GIS; Dron
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