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Oprea L.,University of Galati | Gergely I.,Romanian Waters National Administration | Sion Badalan C.,University of Galati | Cristea D.,University of Galati
Journal of Environmental Protection and Ecology | Year: 2011

The paper shows the results of a study about the monitoring of the ecological aquatic systems in the Crisul Alb river basin. In order to characterise the water quality of the river, the main physicochemical (oxygen, nutrients, salinity, toxic pollutants of natural origin) and biological parameters (benthic macroinvertebrates, microphytobenthos, phytoplankton, ichthyofauna) over two consecutive years, 2007 and 2008, have been determined. Experiments were conducted in 12 monitoring sections. The analysis of the biocenotic characteristics, based on the determinations made, allowed for some remarks regarding the ecological state of the waters, using the saprobic index (the Pantle-Buck method).

Gergely I.,Romanian Waters National Administration | Oprea L.,University of Galati | Sion Badalan C.,University of Galati
Journal of Environmental Protection and Ecology | Year: 2011

Our purpose was to perform a study about the monitoring of the écologie aquatic systems from the Crisul Negru river basin, characterising the water quality of the river. At same time, the main physicochemical and biological parameters within 2 consecutive years, 2007 and 2008, were determined. The experiments were conducted in 10 monitoring sections and the analysis of the biocenotic characteristics, based on the acquired determinations, allowed for some remarks regarding the ecologic state of waters, using the saprobic index, the Pantle-Buck method.

Beciu E.,Romanian Waters National Administration | Seteanu I.,Polytechnic University of Bucharest
UPB Scientific Bulletin, Series D: Mechanical Engineering | Year: 2010

This paper is devoted to the study of backwater slope under the condition of a lateral overflow [1]. The boundary conditions for lateral overflow have been imposed in the upstream for a wide range of input flow discharge corresponding to outflow discharge required in the downstream section [2],[3]. The correlations link between the above mentioned flows have been derived computing also the total discharge through the weir. Several options for the weir height hD of the spillway have been taken into account. The resulting chart outflow versus input flow (for different values of h D) allows us to estimate the mitigation of flood hydrograph.

Dughila A.,Al. I. Cuza University | Iancu O.G.,Al. I. Cuza University | Rascanu I.D.,Romanian Waters National Administration
Carpathian Journal of Earth and Environmental Sciences | Year: 2012

The most important water quality indicators for the Tansa Lake, namely dissolved oxygen (DO), chemical oxygen demand (CODCr), biochemical oxygen demand (BOD5), ammonia, nitrites, nitrates, total nitrogen, orthophosphate, total phosphorus, chlorophyll "a", fixed residue, total suspended matter, chloride, sulphate, calcium, magnesium and detergents were analysed in order to achieve a geochemical evaluation and classification of water quality. The alkaline character of the water from the Tansa Lake was given by the pH values that ranged from 8.3 to 8.6, these being measured in the middle lake section in May, August and November 2010. Trace elements, namely Cd, Cr, Cu, Ni, Pb and Zn were analysed using Atomic Absorption Spectroscopy (AAS). The mean values of these do not exceed the limits of the 1st quality class of the water (Cd - 0.3 μg/L, Cr - 20 μg/L, Cu - 18 μg/L, Ni - 9.5 μg/L, Pb - 3.3 μg/L, Zn - 76 μg/L). In agreement with the current Romanian legislation and the Water Framework Directive - 60/2000/EC, the water quality classes were established. The overall water quality of the Tansa Lake fits into the 2nd quality class. This means that the water can be considered as being in a "good state", but not suitable for drinking purpose. The Tansa Lake belongs to the hypertrophic lake category, in accordance with the analysis of the trophicity degree (total nitrogen - N, 1.11 to 1.23 mg N/L; total phosphorus - P, 0.05 to 0.21 mg P/L and chlorophyll "a", 8 to 36 μg/L).

Moldovan O.T.,Romanian Academy of Sciences | Levei E.,Romanian National Institute for Optoelectronics | Marin C.,Romanian Academy of Sciences | Banciu M.,Babes - Bolyai University | And 7 more authors.
Hydrobiologia | Year: 2011

The purpose of this study was to examine the sensitivity, in a field situation, of the hyporheic fauna to pollution by heavy metals and also to test the use of oxidative stress enzymes produced by this fauna as a sensitive indicator of oxidative stress generated by chemical contamination. This was done by surveying the patterns of distribution, structure, and composition of hyporheic invertebrate communities in one of the most polluted rivers in Romania. Twelve permanent sampling stations with differing water qualities were established along a 180 km transect of the Arieş River. Data on hyporheic invertebrate abundance and richness, chemistry of the surface and hyporheic water and interstitial suspended particles were analyzed via multifactorial analyses. In the downstream, more polluted stations, epigean species were less abundant and hyporheic communities, especially macrocrustaceans and oligochetes, became dominant. The higher levels of hyporheic invertebrate biodiversity in the moderately polluted stations compared to highly polluted, and the increase of the number of some hyporheos (especially macrocrustaceans) in the moderately polluted stations, suggested that the hyporheic fauna was more tolerant of heavy metal pollution than the surface water fauna of the area. However, the different richness and abundance of hyporheic fauna in sites of similar water chemistry suggested that additional factors, such as sediment structure are shaping the spatial distribution of hyporheic fauna. Strong correlations between superoxide dismutase (SOD) activity in pooled tissues extracts and some chemical parameters suggest that oxidative stress enzymes may prove to be sensitive indicators of chemical pollution in hyporheic zones. © 2011 Springer Science+Business Media B.V.

Urdea C.,Ovidius University | Teodorescu D.,Romanian Waters National Administration | Popescu M.,Ovidius University
Journal of Environmental Protection and Ecology | Year: 2014

The present study provides a hydrologic based assessment of surface water resources and their variability at different temporal scales in the Taita river watershed, which is located within the north side of Dobrogea plateau, Romania. The determination of temporal variability was carried out by using monthly stream flow data available for the period 1980 to 2005 for two gauging stations located along the Taita river. The study shows that the hydrological regime of the Taita river watershed has high inter- and intra-annual variability, mainly driven by high temporal variability of precipitation. The correlation analysis between precipitation and stream flow was based on the Pearson method and revealed a number of significant trends in stream flow variables, both increasing and decreasing.

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