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Volume XIII |

The analysis of the susceptibility of the flash-floodsʼ genesis in the area of the hydrographical basin of Bâsca Chiojdului river

Abstract: The present article aims to identify the areas with high susceptibility in the acceleration of the surface flowing of the water and thus, in the delivery of the flash-floods from the hydrographical basin of the Bâsca Chiojdului river, which is situated in one of the most vulnerable areas in Romania (bend area) at the hydrological phenomena of risk. The analysis of the susceptibility was possible by taking into consideration ten main factors that we considered to play an essential role in the genesis of the flash-floods. There resulted a map of the flankʼs surfaces with high susceptibility in the flash-floods’ delivery and their triggering at the layer level of the hydrographical network in the basin. The proposed index, FFSI (Flash Floods Susceptibility Index), resulted from the summation of the analyzed factors, presents mainly the highest values within the area of Drajna Depression, where most of the settlements from the basin are located. The high genesis susceptibility of the flash-floods in this area is due to the association of the most numerous risk factors that we analysed, namely lithology favourable to the pronounced flowing, slopes with high values, high degree of deforestation etc. The areas identified as being critical from the point of view of the potential of flash-floods formation present a high risk for the genesis and triggering other related phenomena such as floods and landslides.