Abstract
Due to the climate changes occurred in the last decades the frequency and intensity of hydrological risk phenomena are also increasing. The flash-floods are considered the most devastating natural hazards around worldwide. The identification of areas with a high flash-flood potential and also of the valleys with a high potential for flash-flood propagation is mandatory to be included in the flash-flood risk management activity. In this regard the present study proposes a GIS methodology to identify the flash-flood potential along river valleys from small catchments. The analysis carried out into a number of 5 small river basins across Romania revealed that a high percentage of river network is characterized by a high and very high flash-flood potential. The results of the present study can be successfully used in the flash-flood risk management activity and also in the activity of flash-flood forecast and warning.
Highlights
The Romanian territory has a great diversity of relief forms
Results and discussions the FFPI index was applied to the 5 basins chosen for the analysis in order to determine the potential flash flood occurrence: Valea Rea river basin (Fig 3), Fernic river basin (Fig. 4), Olănești river basin (Fig. 5), Tecucel river basin (Fig. 6), Casimcea river basin (Fig. 7)
The values of the potential development of flash floods that characterize the valleys in the Feernic basin area, make it an area exposed to the flash floods and fully justify the choice of this basin for case study in the present paper
Summary
The Romanian territory has a great diversity of relief forms. The relief influences the elements of surface runoff by fragmentation degree and the size of the slopes on which the runoff is formed and indirectly, by the role it has in the vertical zone of the climatic elements that generate the leak. Climate changes, occurred in the last decades (Bandoc and Prăvălie, 2015; Prăvălie et al, 2019; Costache and Bui, 2020; Prăvălie et al, 2017; Prăvălie and Bandoc, 2015; Costache et al, 2020b), have a big influence on the increase of natural hazards severity. These types of studies can be very helpful in order to take the most effective measures to diminish the severity of Dragomir Andreea, Tudorache Andreea-Violeta, Costache Romulus flash-flood phenomena. In Romania, the runoff characteristics and flash-flood susceptibility were been studied by many authors in different studies (Costache, 2019a, 2014; Fontanine and Costache, 2013; Mătreață et al, 2017; Minea, 2013; Costache et al, 2014; Zaharia et al, 2012)
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