How to cite: Cornel-Ovidiu MAREŞ (2018) The impact of the torrential precipitations in the formation of floods in the metropolitan area of Satu Mare
Riscuri si Catastrofe Journal, 22(1), P.99-110. DOI: 10.24193/RCJ2018_9
THE IMPACT OF THE TORRENTIAL PRECIPITATIONS IN THE FORMATION OF FLOODS IN THE METROPOLITAN AREA OF SATU MARE
Cornel-Ovidiu MAREŞ
Abstract. The impact of the torrential precipitations in the formation of floods in the metropolitan area of Satu Mare. The study wishes to carry out an analysis of the maximum daily rainfall in the Satu Mare metropolitan area, its role in the formation of floods in the urban perimeter. The rain-drain process is complex in an urban area due to the qualitative changes of the topographic surface. The predomination of impermeable and quasi-impermeable surfaces determines the increase of the drainage coefficients on the urban surface. Corroborated with the reduced interception of highly anthropically modified vegetation and reduced retention due to the dominance of concrete or asphalt surfaces, floods occur on urban subbasins at high intensity rainfall. The maximum daily rainfalls in the Satu Mare metropolitan area exceeded 50 mm / 24 hours in some years, with the period 2007-2009 being noticed, such as values being recorded consecutively. As a case study, was analysed the downpour on May 13, 2017, when rainfall was 48.2 mm between the hours 11:10 - 16:40. The most important part of the rain in the downpour was recorded between 14:00 and 15:20. The high intensities of up to 0.53 mm/min, have generated in conjunction with drainage coefficients above 0.70, characteristic for impermeable surfaces, floods in various urban subbasins of Satu Mare metropolitan area. Comparative analysis of the data obtained from four pluviometric stations located on a 10 km radius in the proximity of the studied metropolitan area revealed a possible influence of the city on the amount of precipitations falling in the area.
Key-words: torrential rainfalls, floods, urban areas, flooding, Satu Mare.
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