HYDROLOGICAL RISK CHARACTERISTICS OF THE OZANA RIVER VALLEY
Journal Title: Present Environment and Sustainable Development - Year 2012, Vol 6, Issue 2
Abstract
The occurrence of hydrological risk phenomena is conditioned by a series of factors, related to climatic, geologic, geomorphologic, pedologic, vegetal aspects etc., which are specific to the drainage basin of the Ozana river. The hydrological risk that has a major impact upon the human settlements in the area, is conditioned by the presence of floods which frequently occur in the rivers flood plain. In this present study, we have emphasised the floods that took place between 2005 and 2008, including the maximum maximorum run-off rate of 456 m³/s, recorded at the Dumbrava hydrometric station, in 2005. By utilising the data gathered from the hydrometric stations, located on the Ozana river valley, we have analysed the propagation of the flood waves generated in the three sectors of the drainage basin: the upper, middle and lower sector. After the analysis, we have observed the fact that the area that was most affected by the floods is the upstream river sector, where numerous households and roads have been flooded. Another aspect of the hydrological risk is related to the minimum run-off of the Ozana river, which is influenced by climatic conditions and alluvial deposits from the riverbed. Therefore, during draughts, taking into consideration the presence of very thick Quaternary deposits, the river runs dry on its lower course, for a variable period of time, which can be from a few days, to six months, every year. This phenomenon directly affects the local population, especially through the diminished water reserve in the area.
Authors and Affiliations
Marina Iosub, Dan Lesenciuc
Keywords
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