Delineation of the Flooded Areas in Urban Environments Based on a Simplified Approach
The Tulcea municipality is frequently exposed to rainfall-generated floods, with its lower downtown area (located in the Danube’ former meadow, now protected by dikes) being flooded two to three times per year. In this study, our objective was to understand the generation mechanism of these rainfall...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/6/3174 |
| _version_ | 1797472915366608896 |
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| author | Cristian Dinu Nicolai Sîrbu Radu Drobot |
| author_facet | Cristian Dinu Nicolai Sîrbu Radu Drobot |
| author_sort | Cristian Dinu |
| collection | DOAJ |
| description | The Tulcea municipality is frequently exposed to rainfall-generated floods, with its lower downtown area (located in the Danube’ former meadow, now protected by dikes) being flooded two to three times per year. In this study, our objective was to understand the generation mechanism of these rainfall-triggered urban floods and to identify tailored mitigation options. Due to the lack of reliable information on the sewage network (diameters, slope, material) and the uncertain sewage outflows during heavy rain events, a rather simplified approach was preferred by the authors of this paper. The data processing was performed using GIS tools, with appropriate accounting of the digital terrain modelling, ortho-photos, administrative boundaries of the Tulcea municipality, delineation of the urban catchments, imagery of the frequently flooded areas, and the urban sewage network. Subsequently, a fast hydrological modelling and a volume-based flooding approach were developed in order to identify and evaluate the flooded urban areas under extreme rainfall events. Upon the completion of the calibration and validation processes, numerical simulations were run that considered the design storms of different return periods. Due to the high slopes of the hills, hence the short concentration time of the pluvial waters, a Sponge City approach does not seem as though it would be easy to implement. A more efficient solution utilising large-capacity buried urban retention tanks in the lower part of the municipality was alternatively identified. Further on, this solution will be supported by a set of green measures. |
| first_indexed | 2024-03-09T20:07:54Z |
| format | Article |
| id | doaj.art-843613362af64766812743cd15b5fcb3 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T20:07:54Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-843613362af64766812743cd15b5fcb32023-11-24T00:24:59ZengMDPI AGApplied Sciences2076-34172022-03-01126317410.3390/app12063174Delineation of the Flooded Areas in Urban Environments Based on a Simplified ApproachCristian Dinu0Nicolai Sîrbu1Radu Drobot2Urban Arte Studio, 021177 Bucharest, RomaniaDepartment of Hydrotechnical Engineering, Technical University of Civil Engineering, 020396 Bucharest, RomaniaDepartment of Hydrotechnical Engineering, Technical University of Civil Engineering, 020396 Bucharest, RomaniaThe Tulcea municipality is frequently exposed to rainfall-generated floods, with its lower downtown area (located in the Danube’ former meadow, now protected by dikes) being flooded two to three times per year. In this study, our objective was to understand the generation mechanism of these rainfall-triggered urban floods and to identify tailored mitigation options. Due to the lack of reliable information on the sewage network (diameters, slope, material) and the uncertain sewage outflows during heavy rain events, a rather simplified approach was preferred by the authors of this paper. The data processing was performed using GIS tools, with appropriate accounting of the digital terrain modelling, ortho-photos, administrative boundaries of the Tulcea municipality, delineation of the urban catchments, imagery of the frequently flooded areas, and the urban sewage network. Subsequently, a fast hydrological modelling and a volume-based flooding approach were developed in order to identify and evaluate the flooded urban areas under extreme rainfall events. Upon the completion of the calibration and validation processes, numerical simulations were run that considered the design storms of different return periods. Due to the high slopes of the hills, hence the short concentration time of the pluvial waters, a Sponge City approach does not seem as though it would be easy to implement. A more efficient solution utilising large-capacity buried urban retention tanks in the lower part of the municipality was alternatively identified. Further on, this solution will be supported by a set of green measures.https://www.mdpi.com/2076-3417/12/6/3174urban floodingtorrential rainsflooded areascontrol measures |
| spellingShingle | Cristian Dinu Nicolai Sîrbu Radu Drobot Delineation of the Flooded Areas in Urban Environments Based on a Simplified Approach Applied Sciences urban flooding torrential rains flooded areas control measures |
| title | Delineation of the Flooded Areas in Urban Environments Based on a Simplified Approach |
| title_full | Delineation of the Flooded Areas in Urban Environments Based on a Simplified Approach |
| title_fullStr | Delineation of the Flooded Areas in Urban Environments Based on a Simplified Approach |
| title_full_unstemmed | Delineation of the Flooded Areas in Urban Environments Based on a Simplified Approach |
| title_short | Delineation of the Flooded Areas in Urban Environments Based on a Simplified Approach |
| title_sort | delineation of the flooded areas in urban environments based on a simplified approach |
| topic | urban flooding torrential rains flooded areas control measures |
| url | https://www.mdpi.com/2076-3417/12/6/3174 |
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