EXTREME DETERIORATION OF WATER QUALITY AND FISH SUFFOCATION PHENOMENA IN THE MARINE ESTUARY

2017 ◽

Author(s):

Kira Slepchuk ◽

Tatyana Khmara ◽

Ekaterina Mankovskaya ◽

...

Keyword(s):

Water Quality ◽

Water Temperature ◽

River Runoff ◽

Small River ◽

Fish Kill ◽

Water Stratification ◽

Temperature Water

The factors that provoke fish suffocation in an estuary, namely: natural (small river runoff, high air and water temperature, water stratification) and anthropogenic (regulation of river, etc.) were marked. Taking into account these factors the calculations were carried out and the possible areas of the Dnieper-Bug estuary, where fish kill of different scale and genesis is found out were identified.

Download Full-text

Physicochemical and Microbiological Assessment of Selected Hand-Dug Wells for Water Quality in Ilesa Metropolis, Southwest Nigeria

Notulae Scientia Biologicae ◽

10.15835/nsb10110058 ◽

2018 ◽

Vol 10 (1) ◽

pp. 52-59

Author(s):

Ayodele Jacob OMOTOSO ◽

Esther Omotola DADA ◽

Olaoluwa OYEDEJI

Keyword(s):

Water Quality ◽

Water Temperature ◽

Air Temperature ◽

Water Samples ◽

Heterotrophic Bacteria ◽

Ambient Air ◽

Total Hardness ◽

Ambient Air Temperature ◽

Dug Wells ◽

Temperature Water

The present study investigated the physicochemical and microbiological assessment of selected hand-dug wells for water quality in Ilesa metropolis. The aim was to assess the groundwater quality. Twenty-five (25) hand-dug wells were randomly selected and water samples were collected four times spanning through the rainy and dry seasons. Physical parameters (ambient air temperature, water temperature, colour, turbidity and total dissolved solids), chemical (pH, conductivity, calcium, magnesium, total hardness, chlorides, sulphates, phosphates and nitrates) and microbiological parameters (total heterotrophic bacteria count, Escherichia coli and total heterotrophic fungi count) of the samples were examined. The data obtained were subjected to relevant statistical analysis. Results showed distinct seasonal variation in ambient air temperature, water temperature, pH and magnesium with highly significant different values at (p ˂ 0.01). Total hardness and sulphates concentrations had high significant different values in the dry season than in the rainy season (p ˂ 0.05) while the total heterotrophic bacteria count was significantly different at (p ˂ 0.001). The bacteria species isolated from well water samples were susceptible to pefloxacin and gentamicin. Comparing with international guide levels for drinking water, water samples were poor and unsuitable for drinking. The study concluded that the presence of multiple antibiotic resistant micro-organisms indicates a serious health hazard to the consumers of water obtained from these wells.

Download Full-text

ESTIMATION OF ANTHROPOGENIC LOAD ON THE VESELUKHA SMALL RIVER BASIN

Міжвідомчий тематичний науковий збірник Меліорація і водне господарство ◽

10.31073/mivg201901-163 ◽

2019 ◽

pp. 82-87

Author(s):

І. V. Gopchak ◽

T. O. Basiuk

Keyword(s):

Water Quality ◽

River Basin ◽

River Runoff ◽

River Basins ◽

Ecological Condition ◽

The State ◽

Small River ◽

Anthropogenic Load ◽

Ecological State ◽

Small River Basin

Relevance of research. As a result of economic activities and irrational use of water and land resources in small river basins there are problems connected with pollution, destruction of natural landscape complexes of river valleys and adjoining territories, engineering reorganization of canals and floodplains as a result of melioration works. All these changes in river basins require operational control and response, which is possible only if real estimation of the level of anthropogenic load on river basins is carried out and the limits of permissible economic interference in their ecosystem are determined. The purpose of research – assessment of the ecological condition of the basin of the Veselukha River by the criteria of anthropogenic load. Research methods. The analysis of anthropogenic load and evaluation of the ecological condition of the Veselukha River basin was carried out in accordance with "Methodology for calculation of anthropogenic load and classification of the ecological state of small river basins of Ukraine". The calculation was made using the logic-mathematical model "Small River Basin", for four independent models of the main subsystems of the river basin: radioactive contamination of the territory, land use, use of river runoff, water quality. The quantitative and qualitative anthropogenic conditions by various indicators of four subsystems for classification of the ecological state of the river basin were estimated. Research results. According to the state of radioactive contamination, the area of the river catchment was estimated as "satisfactory". Based on the results of the analysis, the integrated value of land use was 3.7 and the state of the subsystem "Use of land" in the basin of the Veselukha river was determined as "good". The general state of river runoff use in the basin based on the joint effect of all these indicators of anthropogenic load on the state of the subsystem "Use of river runoff" was evaluated as "good" with a quantitative value of 3.0. The general condition of the subsystem "Water Quality" in the basin of the Veselukha River is characterized by the IV class of water quality, it corresponds to "polluted", with a quantitative level of -1. According to the results of the integrated assessment of all subsystems of the river basin, an induction coefficient of anthropogenic load (ICAN) was specified as is -1.0 and classifies the ecological state of the Veselukha River basin as "minor changes".

Download Full-text

Long-term temperature fluctuations in rivers of the Fore-Sudetic region in Poland

Geografie ◽

10.37040/geografie2018123030279 ◽

2018 ◽

Vol 123 (3) ◽

pp. 279-294 ◽

Cited By ~ 1

Author(s):

Mariusz Ptak

Keyword(s):

Water Quality ◽

Water Temperature ◽

Forest Cover ◽

Temperature Fluctuations ◽

Primary Parameter ◽

Local Factors ◽

South West ◽

Poor Water Quality ◽

Temperature Water

The paper presents an analysis of water temperature fluctuations in four rivers: Nysa Łużycka, Bóbr, Bystrzyca, and Nysa Kłodzka, in south-west Poland (Fore-Sudetic region) in the period 1971–2014. The obtained results show an evident increase in water temperature ranging from 0.15 °C·dec/1 to 0.33 °C·dec/1. Such changes were particularly determined by changes in air temperature. Water temperature increased in two analyzed stations: Zielona Góra and Wrocław by 0.37 and 0.35 °C·dec/1, respectively. While the variability of the rate of warming of particular rivers in the analyzed region should be associated with local factors occurring in the catchments, the contribution of forest cover is of key importance. A change in water temperature constituting its primary parameter will cause further transformation of the discussed river ecosystems. Combined with poor water quality, rising water temperatures can become a factor inhibiting further economic development of the Fore-Sudetic region in Poland.

Download Full-text

Acid Precipitation and its Effects on Water Quality of Small River Basins in Rhode Island

Journal of Environmental Systems ◽

10.2190/w6te-jf55-lk0r-kgmd ◽

1987 ◽

Vol 17 (2) ◽

pp. 79-92 ◽

Cited By ~ 6

Author(s):

Calvin P. C. Poon ◽

Todd Chaplin

Keyword(s):

Water Quality ◽

Rhode Island ◽

Acid Precipitation ◽

River Basins ◽

Small River

Download Full-text

Seasonal Succession of Bacterial Communities in Three Eutrophic Freshwater Lakes

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18136950 ◽

2021 ◽

Vol 18 (13) ◽

pp. 6950

Author(s):

Bin Ji ◽

Cheng Liu ◽

Jiechao Liang ◽

Jian Wang

Keyword(s):

Water Quality ◽

Surface Water ◽

Water Temperature ◽

Bacterial Communities ◽

Seasonal Succession ◽

Lake Eutrophication ◽

Urban Lake ◽

Freshwater Lakes ◽

Functional Prediction ◽

Bacterial Indicator

Urban freshwater lakes play an indispensable role in maintaining the urban environment and are suffering great threats of eutrophication. Until now, little has been known about the seasonal bacterial communities of the surface water of adjacent freshwater urban lakes. This study reported the bacterial communities of three adjacent freshwater lakes (i.e., Tangxun Lake, Yezhi Lake and Nan Lake) during the alternation of seasons. Nan Lake had the best water quality among the three lakes as reflected by the bacterial eutrophic index (BEI), bacterial indicator (Luteolibacter) and functional prediction analysis. It was found that Alphaproteobacteria had the lowest abundance in summer and the highest abundance in winter. Bacteroidetes had the lowest abundance in winter, while Planctomycetes had the highest abundance in summer. N/P ratio appeared to have some relationships with eutrophication. Tangxun Lake and Nan Lake with higher average N/P ratios (e.g., N/P = 20) tended to have a higher BEI in summer at a water temperature of 27 °C, while Yezhi Lake with a relatively lower average N/P ratio (e.g., N/P = 14) tended to have a higher BEI in spring and autumn at a water temperature of 9–20 °C. BEI and water temperature were identified as the key parameters in determining the bacterial communities of lake water. Phosphorus seemed to have slightly more impact on the bacterial communities than nitrogen. It is expected that this study will help to gain more knowledge on urban lake eutrophication.

Download Full-text

Relative Performance of 1-D Versus 3-D Hydrodynamic, Water-Quality Models for Predicting Water Temperature and Oxygen in a Shallow, Eutrophic, Managed Reservoir

Water ◽

10.3390/w13010088 ◽

2021 ◽

Vol 13 (1) ◽

pp. 88

Author(s):

Xiamei Man ◽

Chengwang Lei ◽

Cayelan C. Carey ◽

John C. Little

Keyword(s):

Water Quality ◽

Water Temperature ◽

Water Quality Model ◽

Relative Performance ◽

Bubble Plume ◽

Quality Model ◽

Quality Models ◽

Management Interventions ◽

Water Quality Models ◽

D Model

Many researchers use one-dimensional (1-D) and three-dimensional (3-D) coupled hydrodynamic and water-quality models to simulate water quality dynamics, but direct comparison of their relative performance is rare. Such comparisons may quantify their relative advantages, which can inform best practices. In this study, we compare two 1-year simulations in a shallow, eutrophic, managed reservoir using a community-developed 1-D model and a 3-D model coupled with the same water-quality model library based on multiple evaluation criteria. In addition, a verified bubble plume model is coupled with the 1-D and 3-D models to simulate the water temperature in four epilimnion mixing periods to further quantify the relative performance of the 1-D and 3-D models. Based on the present investigation, adopting a 1-D water-quality model to calibrate a 3-D model is time-efficient and can produce reasonable results; 3-D models are recommended for simulating thermal stratification and management interventions, whereas 1-D models may be more appropriate for simpler model setups, especially if field data needed for 3-D modeling are lacking.

Download Full-text

Simulating Diurnal Variations of Water Temperature and Dissolved Oxygen in Shallow Minnesota Lakes

Water ◽

10.3390/w13141980 ◽

2021 ◽

Vol 13 (14) ◽

pp. 1980

Author(s):

Bushra Tasnim ◽

Jalil A. Jamily ◽

Xing Fang ◽

Yangen Zhou ◽

Joel S. Hayworth

Keyword(s):

Water Quality ◽

Dissolved Oxygen ◽

Water Temperature ◽

Shallow Lakes ◽

Quality Model ◽

Lake Water Quality ◽

Ecological Processes ◽

Turbulent Diffusion Coefficient ◽

Hourly Data ◽

Mean Square Errors

In shallow lakes, water quality is mostly affected by weather conditions and some ecological processes which vary throughout the day. To understand and model diurnal-nocturnal variations, a deterministic, one-dimensional hourly lake water quality model MINLAKE2018 was modified from daily MINLAKE2012, and applied to five shallow lakes in Minnesota to simulate water temperature and dissolved oxygen (DO) over multiple years. A maximum diurnal water temperature variation of 11.40 °C and DO variation of 5.63 mg/L were simulated. The root-mean-square errors (RMSEs) of simulated hourly surface temperatures in five lakes range from 1.19 to 1.95 °C when compared with hourly data over 4–8 years. The RMSEs of temperature and DO simulations from MINLAKE2018 decreased by 17.3% and 18.2%, respectively, and Nash-Sutcliffe efficiency increased by 10.3% and 66.7%, respectively; indicating the hourly model performs better in comparison to daily MINLAKE2012. The hourly model uses variable hourly wind speeds to determine the turbulent diffusion coefficient in the epilimnion and produces more hours of temperature and DO stratification including stratification that lasted several hours on some of the days. The hourly model includes direct solar radiation heating to the bottom sediment that decreases magnitude of heat flux from or to the sediment.

Download Full-text