This paper examines a new approach to the monitoring of the torrent control structures, which is based on mathematical-statistical research of the frequency and magnitude of the behavioural events recorded during the functional period of these structures. The research material consists of the transverse hydrotechnical works placed in 21 managed torrential valleys in a watershed that is located in the Braşov mountainous area (in the centre of Romania), where 24 behavioural event types were identified following a 25-year functional period of the works. First, a hierarchical classification of events was performed according to their frequency of occurrence. Analysis of the correlation and regression proved the existence of a strong correlation between the number of identified events and the number of performed works (and, relatedly, the number of affected parts of works). Finally, in order to emphasize the laws underlying the occurrence and manifestation of the behavioural events, this research investigated the possibility of fitting the frequency distribution of the number of recorded behavioural events by three of the most well-known theoretical distributions: the normal distribution, Charlier type A distribution, and Beta distribution. Given that the assumption of normality regarding the frequency distribution of the behavioural events was met, there now exists a theoretical argument for including the results of the statistical research regarding these events into a new approach elaborating -on the watershed scale -the norms monitoring (in the long term) the hydrotechnical torrent control structures.
Quantification of geomorphological changes and rates of landscape evolution is a matter of primary importance, as much in natural hazards studies as in calibration of landscape evolution models. In this paper it is investigated the influence of dams to morphological processes on a corrected torrential valley situated in mountainous area of Romania. Several approaches were applied for evaluating the stream bed dynamics by using terrestrial measurements and GIS techniques. The methodology is based on comparing the horizontal dynamics measured in different periods based on transversal profiles extracted from digital elevation models, by assessing the vertical dynamics measured in different periods based on longitudinal profiles extracted from digital elevation models and by monitoring of the degree of siltation behind the dams using raster calculator on digital elevation models. The results from the study verified some well know hypothesis related to the stream bed dynamics of a torrential valley but also led to conceiving interesting hypothesis for future research in this field.
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