Water Quality, Hydrology, and Simulated Response to Changes in Phosphorus Loading of Butternut Lake, Price and Ashland Counties, Wisconsin, with Special Emphasis on the Effects of Internal Phosphorus Loading in a Polymictic Lake

2008 ◽  
Author(s):  
Dale M. Robertson ◽  
William J. Rose
Keyword(s):  
Water Quality ◽  
Phosphorus Loading ◽  
Internal Phosphorus Loading ◽  
Polymictic Lake

Evidence for internal phosphorus loading, hypoxia and effects on phytoplankton in partially polymictic Lake Simcoe, Ontario

2013 ◽  
Vol 39 (2) ◽  
pp. 259-270 ◽  
Author(s):  
Gertrud K. Nürnberg ◽  
Lewis A. Molot ◽  
Eavan O'Connor ◽  
Hamdi Jarjanazi ◽  
Jennifer Winter ◽  
...  
Keyword(s):  
Phosphorus Loading ◽  
Lake Simcoe ◽  
Internal Phosphorus Loading ◽  
Polymictic Lake

Variations of internal phosphorus loading and water quality in a hypertrophic lake during 40 years of different management efforts

2017 ◽  
Vol 103 ◽  
pp. 264-274 ◽  
Author(s):  
Jukka Horppila ◽  
Heidi Holmroos ◽  
Juha Niemistö ◽  
Ilmo Massa ◽  
Nina Nygrén ◽  
...  
Keyword(s):  
Water Quality ◽  
Phosphorus Loading ◽  
Hypertrophic Lake ◽  
Internal Phosphorus Loading

Changes in Internal Phosphorus Loading and Fish Population as Possible Causes of Water Quality Decline in a Shallow, Biomanipulated Lake

2009 ◽  
Vol 94 (3) ◽  
pp. 326-337 ◽  
Author(s):  
Gergely Boros ◽  
István Tátrai ◽  
Ágnes Irma György ◽  
Ágnes Vári ◽  
Alex Sándor Nagy
Keyword(s):  
Water Quality ◽  
Fish Population ◽  
Phosphorus Loading ◽  
Internal Phosphorus Loading

Long-Term (15 Years) Results of NPS Controls in an Agricultural Watershed upon a Receiving Lake's Water Quality

1993 ◽  
Vol 28 (3-5) ◽  
pp. 441-449 ◽  
Author(s):  
Paul J. Garrison ◽  
Timothy R. Asplund
Keyword(s):  
Water Quality ◽  
Structural Changes ◽  
Soil Phosphorus ◽  
Water Clarity ◽  
Management Control ◽  
Agricultural Watershed ◽  
Control Measures ◽  
Phosphorus Loading ◽  
Phosphorus Concentration ◽  
White Clay

Nonpoint source controls were installed in a 1215 ha agricultural watershed in northeastern Wisconsin in the late 1970. Changes were made in handling of animal wastes and cropping practices to reduce runoff of sediment and nutrients. Modelling results predicted a reduction in phosphorus runoff of 30 percent. The water quality of White Clay Lake has worsened since the installation of NPS controls. The lake's phosphorus concentration has increased from a mean of 29 µg L−1 in the late 1970s to 44 µg L−1 in recent years. Water clarity has declined from 2.7 to 2.1 m and the mean summer chlorophyll levels have increased from 9 to 13 µg L−1 with peak values exceeding 40 µg L−1. Increased phosphorus loading is not the result of elevated precipitation but instead the failure of the control measures to sufficiently reduce P loading. Most of the effort was placed on structural changes while most of the P loading comes from cropland runoff. Further, soil phosphorus concentrations have increased because of artificial fertilizers and manure spreading. The White Clay Lake experience is discouraging since the majority of the polluters in this watershed utilized some NPS control practices, including 76 percent of the farms which installed waste management control facilities.

scholarly journals Assessment of Trophic Responses of a Reservoir to Seasonal and Annual Variations in Monsoon

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2117
Author(s):  
Su-mi Kim ◽  
Hyun-su Kim
Keyword(s):  
Water Quality ◽  
Trophic State ◽  
Monsoon Season ◽  
Phytoplankton Growth ◽  
Phosphorus Loading ◽  
Nutrient Concentrations ◽  
Trophic State Index ◽  
Post Monsoon ◽  
Post Monsoon Season ◽  
State Index

The variations in water quality parameters and trophic status of a multipurpose reservoir in response to changing intensity of monsoon rain was investigated by applying a trophic state index deviation (TSID) analysis and an empirical regression model to the data collected in two periods from 2014 to 2017. The reservoir in general maintained mesotrophic conditions, and Carlson’s trophic state index (TSIc) was affected most by TSITP. Nutrient concentrations, particularly phosphorus, did not show strong correlations with precipitation, particularly in the period with weak monsoon, and a significant increase in total phosphorus (TP) was observed in Spring 2015, indicating the possibility of internal phosphorus loading under decreased depth and stability of water body due to a lack of precipitation. TSIChl was higher than TSISD in most data in period 1 when a negligible increase in precipitation was observed in the monsoon season while a significant fraction in period 2 showed the opposite trend. Phytoplankton growth was not limited by nutrient limitation although nutrient ratios (N/P) of most samples were significantly higher than 20, indicating phosphorus-limited condition. TSID and regression analysis indicated that phytoplankton growth was limited by zooplankton grazing in the Spring, and that cell concentrations and community structure in the monsoon and post-monsoon season were controlled by the changing intensity of the monsoon, as evidenced by the positive and negative relationships between community size and cyanobacterial population with the amount of precipitation in the Summer, respectively. The possibility of contribution from internal loading and an increase in cyanobacterial population associated with weak monsoon, in addition to potential for nutrient enrichment in the post-monsoon season, implies a need for the application of more stringent water quality management in the reservoir that can handle all potential scenarios of eutrophication.

scholarly journals Characterization of sedimentary phosphorus in Lake Erie and on-site quantification of internal phosphorus loading

2021 ◽  
Vol 188 ◽  
pp. 116525
Author(s):  
Y.T. Wang ◽  
T.Q. Zhang ◽  
Y.C. Zhao ◽  
J.J.H. Ciborowski ◽  
Y.M. Zhao ◽  
...  
Keyword(s):  
Lake Erie ◽  
Phosphorus Loading ◽  
Internal Phosphorus Loading

Fighting internal phosphorus loading: An evaluation of the large scale application of gradual Fe-addition to a shallow peat lake

2015 ◽  
Vol 83 ◽  
pp. 78-89 ◽  
Author(s):  
A.K. Immers ◽  
E.S. Bakker ◽  
E. Van Donk ◽  
G.N.J. Ter Heerdt ◽  
J.J.M. Geurts ◽  
...  
Keyword(s):  
Large Scale ◽  
Phosphorus Loading ◽  
Internal Phosphorus Loading ◽  
Fe Addition
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