Estimating flood risk for Dendropotamos torrent of Thessaloniki, Greece
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2023-01-11 17:10
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556.166(495) (1)
Hidrosfera. Apa în general. Hidrologie (450)
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KOMIS, Panagiotis, FILIPPIDIS, Evangelos, ZAIMES, George N.. Estimating flood risk for Dendropotamos torrent of Thessaloniki, Greece. In: Environmental Challenges in the Black Sea Basin: Impact on Human Health, 23-26 septembrie 2020, Galaţi. Cluj-Napoca, România: Universitatea „Dunarea de Jos”, Galați, 2020, p. 32. ISBN 978-606-17-1691-3.
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Environmental Challenges in the Black Sea Basin: Impact on Human Health 2020
Conferința "Environmental Challenges in the Black Sea Basin: Impact on Human Health"
Galaţi, Romania, 23-26 septembrie 2020

Estimating flood risk for Dendropotamos torrent of Thessaloniki, Greece

CZU: 556.166(495)

Pag. 32-32

Komis Panagiotis, Filippidis Evangelos, Zaimes George N.
 
International Hellenic University
 
Disponibil în IBN: 7 decembrie 2020


Rezumat

Floods are natural disasters that can cause damages to infrastructures and also lead to the loss of human lives. Climate change has and will continue to increase the frequency and magnitude of floods. Floods are a serious problem in urbanized areas since most cities and towns are built around rivers and streams and because of the high density of people. Flash floods that are quite frequent in the Mediterranean region, are a major concern in urban areas that have build along or in torrents. In this study a flood risk analysis was implemented for the Dendropotamos torrent that pass through the city of Thessaloniki in Northern Greece. Specifically, the softwares HEC-Ras, QGIS and Ras Mapper were utilized. Initially stream field cross-sectionσ of the torrent were taken as in it goes through the city. A total of 35 cross-section were taken using a GPS and these points were afterwards entered into the HEC-RAS program. In QGIS that Digital Elevation Model (DEM) for Dendropotamos watershed was developed. HEC-RAS is a hydraulic model that allows you to perform one-dimensional steady flow, one and two-dimensional unsteady flow calculations, sediment transport/mobile bed computations, and water temperature/water quality modeling. In this case, the level of stream flows in each cross-section that indicated the areas that have the potential of flooding. Finally, Ras Mapper was used to develop maps based on the results of the study. Overall, the results of the HEC-RAS, indicate that several urban areas of Thessaloniki have a high flood risk. Based on these results the following recommendations were suggested to mitigate flood risk: a) cleaning and widening (when possible) of the torrent bed, b) protecting the stream banks with concrete walls or gabions, c) demolition of illegal buildings in the torrent bed, d) implementation of other flood protection infrastructures in areas indicated as high flood risk by HEC-RAS and e) greater awareness of the flood risks through events and workshops for the citizens of Thessaloniki. Finally, efforts should be made to adopt, integrated watershed management plans, ecosystem-based approaches and nature-based solutions to restore the degraded torrential ecosystem.