Rainfall thresholds for flood triggering. The case of Marathonas in Greece |
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Authors: | Michalis Diakakis |
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Institution: | (1) Faculty of Geology and Geoenvironment, School of Sciences, National and Kapodistrian University of Athens, Panepistimioupoli, 157 84 Athens, Greece |
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Abstract: | Basins across Mediterranean coast are often subject to rapid inundation phenomena caused by intense rainfall events. In this
flash flooding regime, common practices for risk mitigation involve hydraulic modeling, geomorphic, and hydrologic analysis.
However, apart from examining the intrinsic characteristics of a basin, realistic flood hazard assessment requires good understanding
of the role of climatic forcing. In this work, peak rainfall intensities, total storm accumulation, average intensity, and
antecedent moisture conditions of the 52 most important storms in record, during the period from 1993 to 2008, in northeast
Attica, in Greece, are examined to investigate whether there is a correlation between specific rainfall conditions and flood
triggering in the area. For this purpose, precipitation data from a network of five rain gauges installed across the study
area were collected and analyzed. Storms totals, average intensity, antecedent moisture conditions, and peak intensities variations
were calculated and compared with local flooding history. Results showed that among these rainfall measures, only peak storm
intensity presents a significant correlation with flood triggering, and a rainfall threshold above which flooding becomes
highly probable can be defined. |
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Keywords: | |
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