Ecological Status Assessment of Batova River (Bulgaria) (original) (raw)
Related papers
Environmental monitoring of Novoselska River, Bulgaria
Environmental monitoring of Novoselska River, Bulgaria, 2017
This current study provides some information about the environmental parameters of the Novoselska River`s environment in the village of Slokoshtitsa, Kyustendil. The water of the Novoselska River is relatively clean as there were no major anomalies in the measured parameters. At the entrance of the river in the village of Slokoshtitsa the river is cleaner than at the exit of the village, especially after the dumpsites. Although the dumpsites are small in size, it is clear from the survey that there is pollution around and after them. The values of all studied parameters increased in these areas. Dirty water with residues of detergents and disinfectants from the village flows into the river, the dirty water has presence of cyanuric acid in it. The covered portion of the river has a temperature different from that of the natural part of the river, during the cold months it is higher, and in the warmer months it is lower than the temperature of the environment. This can negatively affect the ecosystem of the river. Water`s hardness is medium to high, which means that after the construction of the dam, it must pass through the softener before it is available for drinking or for agricultural water. The water at the time of the testing is not suitable for systemic watering of the crops and watering of livestock due to high concentrations of cyanuric acid and copper. A constant environmental monitoring of the Novoselska River is necessary in order to collect data about the river before and after the construction of the Kyustendil dam.
Water quality assessment of aquatic ecosystems using ecological criteria – case study in Bulgaria
Biotechnology & Biotechnological Equipment, 2014
Four aquatic ecosystems (two rivers and two dams) situated in the western part of Bulgaria were investigated over a three years' period. The River Egulya and Petrohan dam are situated in mountainous regions at about 1000 m altitude, and are not influenced by any anthropogenic sources. Petrohan dam is a site for long-term ecosystem research as a part of Bulgarian long-term ecological research network. The other two systems belong to populated industrial areas. The River Martinovska flows through a region with former long-term mining activity, while Ogosta dam is near a battery production factory. Both the geochemical and geographical ecosystems' conditions are different, and their social usage as well. Ogosta dam water is used for irrigation and Petrohan dam for electric supply. The ecosystem sensitivity to heavy metals was evaluated by a critical load approach. Two criteria were used for risk assessment: critical load exceedance and microbial toxicity test. All studied ecosystems were more sensitive to cadmium than to lead deposition. The potential risk of Cd damage is higher for Petrohan dam and the River Egulya, where critical load exceedance was calculated for two years. Pseudomonas putida growth inhibition test detected a lack of toxicity for all studied ecosystems at the time of investigation with the exception of the low water September sample of the River Martinovska. The fast bacterial test is very suitable for a regular measurement of water toxicity because of its simplicity, lack of sophisticated equipment and clear results.
Environmental monitoring of Dragovishtitsa River, Bulgaria
Environmental monitoring of Dragovishtitsa River, Bulgaria, 2015
General aim of the study is collecting of data for the environment and the ecosystem of Dragovishtitsa River, Bulgaria and receiving of information for its influence on contamination of the Struma (Strimon) river. Samples are taken and measurements are done at intervals about 500 m along the river as well as the estuary at place of its entrance into the Struma river. By this way 50 points of measurements in Serbia and 50 points in Bulgaria were measured. The main conclusion of the study is that the water of Dragovishtitsa river responds to the type R3-Mountain river as almost all measured parameters are in normal range with few exemptions for Cyanuric acid and nitrate content. There were measured 45 parameters of the environment and most of them are result of natural processes. Only Cyanuric acid and nitrates are in relatively high range around the waste canals from human living in Serbia and agricultural farms in Bulgaria. Recommendation is to be taken attention on this kind of contaminator with relation of the governmental efforts for restoration of the population of the Brown trout fish into the river.
Environmental monitoring of Dragovishtitsa River, Bulgaria (continuation)
Environmental monitoring of Dragovishtitsa River, Bulgaria (continuation), 2016
General aim of the study is collecting of data for the environment and the ecosystem of Dragovishtitsa River, Bulgaria and receiving of information for its influence on contamination of the Struma (Strimon) river. Samples are taken and measurements are done at intervals about 500 m along the river as well as the estuary at place of its entrance into the Struma river. By this way 50 points of measurements in Serbia and 50 points in Bulgaria were measured. The main conclusion of the study is that the water of Dragovishtitsa river responds to the type R3-Mountain river as almost all measured parameters are in normal range with few exemptions for Cyanuric acid and nitrate content. There were measured 45 parameters of the environment and most of them are result of natural processes. Only Cyanuric acid and nitrates are in relatively high range around the waste canals from human living in Serbia and agricultural farms in Bulgaria. Recommendation is to be taken attention on this kind of contaminator with relation of the governmental efforts for restoration of the population of the Brown trout fish into the river.
The practicability of the recently developed Bulgarian Biotic Index (BGBI) was tested with the aim to assess the ecological status of the Struma River. The values obtained were compared with the invertebrate community parameters and a set of standardized indices, officially approved for water quality assessment in Bulgaria. High and reliable correlation between BGBI and number of species, and its derivative-species richness, was found. The BGBI moderately correlates with Shannon-Weaver's species diversity and saprobic indices. Generally, the BGBI was found to follow the fundamental trend towards enrichment of the species richness alongside primary saprobic succession in naturally pure waters and along self-purification processes without any specific response to various kinds of environmental stress that affects single watercourses like hydro-morphological changes, regulated discharge, intensive water abstraction and possible toxic pollution that may influence the dynamics and the values of the BGBI besides the changing degree of saprobity along the Struma River. To this end, BGBI may have importance while assessing the biological quality and/or ecological status of the studied rivers rather than for direct estimation of the pollution degree like saprobic indices used to do.
Ecological monitoring of the fresh waters in Stara Zagora Region, Bulgaria
Desalination, 2010
The aim of the present study was the ecological monitoring of the natural waters in Stara Zagora Region, Bulgaria, establishing of a database and correlations regarding three basic parametersnitrates, nitrites and ammonium, to provide a framework for sustainable management of the natural surface and groundwaters in the stated region. To accomplish this goal, the concentrations of nitrogen compounds in real surface and groundwater samples taken from 16 sampling points situated in four municipalities of Stara Zagora Region were spectrophotometrically determined and the statistical significance of the data was tested. The results obtained displayed that nitrite-nitrogen could be classified as a potential pollutant in the surface waters from Stara Zagora and Chirpan municipalities. NH 4 + -N concentrations were in the range of 0.118-0.462 mg L − 1 in 6 of the samples, thus pertaining to II category surface waters. The comparative analyses proved that nitrate-nitrogen could not be classified as a contaminant. The derived exponential correlation between NO 3 − -N and NO 2 − -N concentrations in Tundzha River allows mathematical modelling of the results.
Practicability of different biological indices used in Bulgaria was tested, aiming assessment of the ecological status of the Struma River. The values obtained were compared with the invertebrate community parameters and set of standardized saprobiological indices for water quality assessment officially approved in Bulgaria. None of these indices showed strong correlation with community parameters. The number of species (SPEC) showed weak correlation, which describes the independence of the different indices of the number of species in the sample. Two saprobiological indices – Pantle&Buck (SPUB) and Rothschein's (SROT) showed good correlation (R ≈ 0.7) with the biotic indices under study. Generally, the biological indices follow the fundamental trend towards enrichment of biodiversity as a non-specific community response to improving ecological status of the river. Biotic indices could be applied while assessing the ecological status of the studied rivers rather than for direct estimation of the pollution degree.
SIMI 2018, 2018
The present study assessed the spatial water quality variation of physical and chemical variables. The water quality data were collected during May 2018 from several sampling stations distributed between Ceatal Izmail and Sf. Gheorghe branch and up to the Dunavat Canal, as well as Razim and Golovita lakes. The sampling stations were selected on the basis of their contamination susceptibility, i.e., the station located along the above-mentioned sector of the Danube River were tended to be more impaired by the human related activities. Instead, the stations downstream to the Danube River (the lower course-deltaic area), i.e., Razim and Golovita lakes were supposed to be less impaired by the urban and rural contamination. The investigated sites are of particular interest since they belong to the Danube Delta Biosphere Reserve (DDBR). The following water quality parameters were measured: depth (m), temperature (o C), pH (units), dissolved oxygen content (mg/l), electrical conductivity (µS/cm), total dissolved solids (mg/l), sulphates (mg/l), nitrite-nitrogen (mg/l), nitrate-nitrogen (mg/l), orthophosphates (mg/l), chlorophyll "a" (µg/l), turbidity (NTU), total suspended solids (mg/l), Secchi visibility (m), silica content (mg/l) etc. Overall, the results indicated that some variables presented comparable values that have not exceeded those limits recommended by the reference standard. Instead, the fall in the quality of water (any abnormal values encountered in a few situations) may be related to a wide range of local natural environmental circumstances, as well as anthropic factors. The outcomes obtained from the present study shall be useful in the future environmental assessment of the aquatic ecosystems in DDBR area.
Indicative ecological status assessment of the Despotovica river
Kragujevac Journal of Science, 2018
The investigation of the Despotovica River was carried out in April 2017 with the aim to provide an indicative ecological status assessment. Phytobenthos and aquatic macroinvertebrate communities were followed as well as physico-chemical parameters of water. Ecological status assessment is given based on biological (epilithic diatoms and macroinvertebrates) and supporting physico-chemical water quality elements, according to the Serbian National regulation on parameters of ecological and chemical status of surface waters and parameters of chemical and quantitative status of ground waters. The ecological status was determined by the worst evaluated water quality element. Based on the analysis of investigated parameters of biological and physico-chemical water quality elements, the indicative ecological status of the Despotovica River could be assessed as bad (class V), which is the result of the river's load of organic and inorganic origin but also of heavy metals.