scholarly journals The impact of changed river discharge on water quality deterioration in a prairie lake revealed by the sedimentary evidence

2017 ◽  
Vol 18 (1) ◽  
pp. 299-305
Author(s):  
Hongbin Gao ◽  
Changyou Li ◽  
Biao Sun
Keyword(s):  
Water Quality ◽  
River Discharge ◽  
Stable Carbon Isotopes ◽  
Nutrient Level ◽  
Lake Water Quality ◽  
Quality Deterioration ◽  
Potential Factors ◽  
Sedimentary Core ◽  
Water Quality Deterioration ◽  
The Impact

Abstract In order to investigate the historical water quality state and identify the factors causing modern environmental degradation in a prairie lake, total organic carbon (TOC), total nitrogen (TN), stable carbon isotopes of organic matter and total phosphorus (TP) from lake sedimentary core with high resolution age frame were analyzed. The results show that the values of proxies (TOC, TN, TP, δ13C, C/N) increased significantly after 2000 compared with before, which indicates Lake Hulun has heightened nutrient level and pollution extent, thus induced growth of algal bloom and water quality deteriorated after 2000. Since the event of decreased river discharge and lowered water level began in 2000 corresponds extremely well with our sedimentary records that nutrients pollution and eutrophication occurred in Lake Hulun at the same moment, the change of river discharge can be seen as the primary and direct reason of lake water quality deterioration in this period. In addition, the increased wind and water erosion as a result of serious and widespread destruction of grassland in Lake Hulun basin is the potential factors for changing the nutrients concentration in Lake Hulun.

Quantifying tap-to-household water quality deterioration in urban communities in Vellore, India: The impact of spatial assumptions

2017 ◽  
Vol 220 (1) ◽  
pp. 29-36 ◽  
Author(s):  
Tania M. Alarcon Falconi ◽  
Alexandra V. Kulinkina ◽  
Venkata Raghava Mohan ◽  
Mark R. Francis ◽  
Deepthi Kattula ◽  
...  
Keyword(s):  
Water Quality ◽  
Urban Communities ◽  
Quality Deterioration ◽  
Household Water ◽  
Water Quality Deterioration ◽  
The Impact

scholarly journals Citizen Science Tools Reveal Changes in Estuarine Water Quality Following Demolition of Buildings

2021 ◽  
Vol 13 (9) ◽  
pp. 1683
Author(s):  
Nandini Menon ◽  
Grinson George ◽  
Rajamohananpillai Ranith ◽  
Velakandy Sajin ◽  
Shreya Murali ◽  
...  
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Citizen Science ◽  
Secchi Depth ◽  
Lake Water Quality ◽  
Demolition Waste ◽  
Water Colour ◽  
Water Quality Variables ◽  
The Impact

Turbidity and water colour are two easily measurable properties used to monitor pollution. Here, we highlight the utility of a low-cost device—3D printed, hand-held Mini Secchi disk (3DMSD) with Forel-Ule (FU) colour scale sticker on its outer casing—in combination with a mobile phone application (‘TurbAqua’) that was provided to laymen for assessing the water quality of a shallow lake region after demolition of four high-rise buildings on the shores of the lake. The demolition of the buildings in January 2020 on the banks of a tropical estuary—Vembanad Lake (a Ramsar site) in southern India—for violation of Indian Coastal Regulation Zone norms created public uproar, owing to the consequences of subsequent air and water pollution. Measurements of Secchi depth and water colour using the 3DMSD along with measurements of other important water quality variables such as temperature, salinity, pH, and dissolved oxygen (DO) using portable instruments were taken for a duration of five weeks after the demolition to assess the changes in water quality. Paired t-test analyses of variations in water quality variables between the second week of demolition and consecutive weeks up to the fifth week showed that there were significant increases in pH, dissolved oxygen, and Secchi depth over time, i.e., the impact of demolition waste on the Vembanad Lake water quality was found to be relatively short-lived, with water clarity, colour, and DO returning to levels typical of that period of year within 4–5 weeks. With increasing duration after demolition, there was a general decrease in the FU colour index to 17 at most stations, but it did not drop to 15 or below, i.e., towards green or blue colour indicating clearer waters, during the sampling period. There was no significant change in salinity from the second week to the fifth week after demolition, suggesting little influence of other factors (e.g., precipitation or changes in tidal currents) on the inferred impact of demolition waste. Comparison with pre-demolition conditions in the previous year (2019) showed that the relative changes in DO, Secchi depth, and pH were very high in 2020, clearly depicting the impact of demolition waste on the water quality of the lake. Match-ups of the turbidity of the water column immediately before and after the demolition using Sentinel 2 data were in good agreement with the in situ data collected. Our study highlights the power of citizen science tools in monitoring lakes and managing water resources and articulates how these activities provide support to Sustainable Development Goal (SDG) targets on Health (Goal 3), Water quality (Goal 6), and Life under the water (Goal 14).

scholarly journals Evaluation of the River-Shallow Aquifer Exchange Process Effect on Surface Water Quality Deterioration

2017 ◽  
Vol 05 (06) ◽  
pp. 121-132
Author(s):  
Ismail Karaoui ◽  
Abdelkrim Arioua ◽  
Abdelkhalek El Amrani Idrissi ◽  
Wafae Nouaim ◽  
Driss Elhamdouni ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Exchange Process ◽  
Surface Water Quality ◽  
Shallow Aquifer ◽  
Quality Deterioration ◽  
Water Quality Deterioration

scholarly journals Exploring the water quality driving mechanism in Poyang Lake, the largest freshwater lake in China

2019 ◽  
Vol 20 (2) ◽  
pp. 700-711 ◽  
Author(s):  
Hua Wang ◽  
John Paul Kaisam ◽  
Shaowen Fang ◽  
Yanqing Deng ◽  
Bao Li ◽  
...  
Keyword(s):  
Water Quality ◽  
Atmospheric Deposition ◽  
Poyang Lake ◽  
Freshwater Lake ◽  
Driving Mechanism ◽  
Ecosystem Structure ◽  
Lake Water Quality ◽  
Sediment Release ◽  
The Impact ◽  
Boundary Input

Abstract Poyang Lake, the largest freshwater lake and typical river-connected lake in China, was selected as a research area. A method was first proposed to quantitatively explore the mechanisms driving water quality evolution, in which the weights of horizontal boundary input, self-purification, vertical atmospheric deposition and sediment release could be determined. A two-dimensional water environment model for Poyang Lake was developed in the framework of the Finite Volume Method and calibrated against the field investigated data. Four typical months in a common-water year were determined for numerical experiments to investigate the temporal and spatial water quality driving mechanisms in Poyang Lake. The results suggested that boundary input and self-purification have the greatest effect on dominating the water quality in Poyang Lake, followed by atmospheric deposition and sediment release. The driving weights of these four factors are 57.2%, 26.5%, 9.3%, and 7.0%, respectively. However, the impact on lake water quality of external water quality, aquatic ecosystem structure, precipitation distribution, and meteorological conditions, which are attributed to the disparities in geographical situation, varied significantly with seasons and locations.

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