Quantifying the effects of hydrological changes on long-term water quality trends in temperate reservoirs: insights from a multi-scale, paleolimnological study

2018 ◽  
Vol 60 (3) ◽  
pp. 361-379 ◽  
Author(s):  
Leanne Elchyshyn ◽  
Jean-Olivier Goyette ◽  
Émilie Saulnier-Talbot ◽  
Roxane Maranger ◽  
Christian Nozais ◽  
...  
Keyword(s):  
Water Quality ◽  
Multi Scale ◽  
Hydrological Changes ◽  
Water Quality Trends

scholarly journals Determining Long-Term Trends of Four Fast-Eutrophicated Lakes in China and Finland

2015 ◽  
Vol 8 (1) ◽  
pp. 39 ◽  
Author(s):  
Mengna Liao ◽  
Ge Yu ◽  
Anne-Mari Ventelä ◽  
Xuhui Dong
Keyword(s):  
Water Quality ◽  
Anthropogenic Impacts ◽  
Turning Points ◽  
Dynamic Modelling ◽  
Sharp Change ◽  
Temperature Variations ◽  
Long Term Trends ◽  
Nutrient Changes ◽  
Water Quality Trends

<p>Lake eutrophication has increased in pace in recent decades and has caused serious environmental problems However, the development trends have not been fully determined as it is difficult to recognize complex effects emanating from both climate and human mechanisms. China has many lakes in different trophic stages, which represent three developing stages from forest- to agriculture-, and then to urban-lake, typically in Lakes Lugu, Taibai, and Taihu. To determine long-term water quality trends, the three lakes were chosen for statistic analysis on dominant effects on the diatom-inferred nutrient changes, and to undertake dynamic modelling regarding climate-controlled nutrient changes. The results indicate the significant turning points of water quality in Lakes Lugu, Taibai and Taihu occurring in the 1990s, 1950s and 1940s respectively, which were effected from human activities by increases in tourism, farming and urbanization respectively. Water quality changes in Lakes Lugu, Taibai and Taihu captured 68.4%, 54.9%, and 86.0% of the temperature variations before the turning points. The anthropogenic impacts explained 84.0%, 96.4% and 96.0% of the water quality variations after the turning points, where the sharp change of water quality by human activity has played an accelerated effect on the gentle change of temperature. Compared with the 4 phases of water quality development in Pyhäjärvi Lake (SW Finland), Lakes Lugu and Taibai have experienced the 1<sup>st</sup> and 2<sup>nd</sup> phases, and Taihu has experienced from the 2<sup>nd</sup> to 3<sup>rd</sup> phases during the last 150 years. Phase 4 has not occurred in the three lakes, but it is a key period during the eutropication we need to pay attentions.</p>

Long-term Water Quality Trends after Implementing Best Management Practices in South Florida

2009 ◽  
Vol 38 (4) ◽  
pp. 1683-1693 ◽  
Author(s):  
Samira H. Daroub ◽  
Timothy A. Lang ◽  
Orlando A. Diaz ◽  
Sabine Grunwald
Keyword(s):  
Water Quality ◽  
Best Management Practices ◽  
Management Practices ◽  
South Florida ◽  
Best Management ◽  
Water Quality Trends

LONG-TERM WATER QUALITY TRENDS IN A PARTLY FLOODED UNDERGROUND COAL MINE

2004 ◽  
Vol 2004 (1) ◽  
pp. 1438-1459
Author(s):  
Eric F. Perry ◽  
◽  
Henry W. Rauch
Keyword(s):  
Water Quality ◽  
Coal Mine ◽  
Underground Coal Mine ◽  
Water Quality Trends

scholarly journals A review of long-term pesticide monitoring studies to assess surface water quality trends

2020 ◽  
Vol 9 ◽  
pp. 100064
Author(s):  
R. Chow ◽  
R. Scheidegger ◽  
T. Doppler ◽  
A. Dietzel ◽  
F. Fenicia ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Surface Water Quality ◽  
Pesticide Monitoring ◽  
Water Quality Trends

Long-Term Water Quality Trends in the Lake Okeechobee Watershed, Florida

2011 ◽  
Vol 41 (sup1) ◽  
pp. 548-575 ◽  
Author(s):  
Joyce Zhang ◽  
Patricia Burke ◽  
Nenad Iricanin ◽  
Steven Hill ◽  
Susan Gray ◽  
...  
Keyword(s):  
Water Quality ◽  
Lake Okeechobee ◽  
Water Quality Trends

4.  Diatom‐based Paleolimnological Assessment of Long Term Water Quality Trends, Near Forrest Island, Lake of the Woods, Ontario

2017 ◽  
Author(s):  
Ashley Jenkin
Keyword(s):  
Water Quality ◽  
Algal Blooms ◽  
Multiple Stressors ◽  
Cyanobacterial Blooms ◽  
Lake Of The Woods ◽  
A Site ◽  
Water Quality Trends ◽  
Water Quality Deterioration ◽  
The City

Lake of the Woods (LOW) is a large, international freshwater body that shares borders with Ontario, Manitoba, and Minnesota. Previous studies from the LOW have found that water quality is spatially variable in this complex lake. The current perception is that cyanobacterial blooms have increased in frequency and intensity, generating much interest in determining whether increased nutrients have resulted in water quality deterioration. To address this concern, paleolimnological techniques will be used to examine changes in diatom assemblage over the last ca. 200 years on a dated sediment core retrieved near Forrest Island, close to the city of Kenora, Ontario. Comparisons will be made to other LOW sites that are elevated in total phosphorous (TP) and experience algal blooms (impact sites) as well as a site with low TP that does not experience algal blooms (reference site). Based on the Forrest Island diatom shifts, the following questions will be examined: (1) What is the baseline condition of this site? (2) Have diatom assemblages and/or water quality changed over time? (3) If so, are these changes comparable to other LOW sites?; and (4)What are the potential mechanisms for these changes? To aid our interpretation, a diatom‐based inference model for TP will be applied downcore to examine whether TP concentrations have changed over the last few centuries. Additionally, other mechanisms such as recent warming will also be examined. Results from this study could have important implications related to the impacts of multiple stressors on the LOW

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