Technical Note: Pineview Reservoir Nutrient Loading, Unloading, and the Role of Groundwater in the Estimates

2011 ◽  
Vol 54 (6) ◽  
pp. 2219-2225
Author(s):  
T. N. Reuben ◽  
B. K. Worwood ◽  
L. D. Carrigan ◽  
D. L. Sorensen
Keyword(s):  
Nutrient Loading ◽  
Technical Note

scholarly journals A Model Study on the Role of Wetland Zones in Lake Eutrophication and Restoration

2001 ◽  
Vol 1 ◽  
pp. 605-614 ◽  
Author(s):  
J.H. Janse ◽  
W. Ligtvoet ◽  
S. Van Tol ◽  
A.H.M. Bresser
Keyword(s):  
Nutrient Loading ◽  
Predatory Fish ◽  
Nutrient Concentrations ◽  
Fish Stock ◽  
Mixing Rate ◽  
Marsh Vegetation ◽  
Model Calculations ◽  
Critical Loading ◽  
Marsh Area

Shallow lakes respond in different ways to changes in nutrient loading (nitrogen, phosphorus). These lakes may be in two different states: turbid, dominated by phytoplankton, and clear, dominated by submerged macrophytes. Both states are self-stabilizing; a shift from turbid to clear occurs at much lower nutrient loading than a shift in the opposite direction. These critical loading levels vary among lakes and are dependent on morphological, biological, and lake management factors. This paper focuses on the role of wetland zones. Several processes are important: transport and settling of suspended solids, denitrification, nutrient uptake by marsh vegetation (increasing nutrient retention), and improvement of habitat conditions for predatory fish. A conceptual model of a lake with surrounding reed marsh was made, including these relations. The lake-part of this model consists of an existing lake model named PCLake[1]. The relative area of lake and marsh can be varied. Model calculations revealed that nutrient concentrations are lowered by the presence of a marsh area, and that the critical loading level for a shift to clear water is increased. This happens only if the mixing rate of the lake and marsh water is adequate. In general, the relative marsh area should be quite large in order to have a substantial effect. Export of nutrients can be enhanced by harvesting of reed vegetation. Optimal predatory fish stock contributes to water quality improvement, but only if combined with favourable loading and physical conditions. Within limits, the presence of a wetland zone around lakes may thus increase the ability of lakes to cope with nutrients and enhance restoration. Validation of the conclusions in real lakes is recommended, a task hampered by the fact that, in the Netherlands, many wetland zones have disappeared in the past.

The Role of Flexible Neuroendoscopy in Spinal Neurocysticercosis: Technical Note and Report of 3 Cases

2019 ◽  
Vol 130 ◽  
pp. 77-83
Author(s):  
Jaime Gerardo Torres-Corzo ◽  
Mario Alberto Islas-Aguilar ◽  
Dominic Shelby Cervantes ◽  
Juan Carlos Chalita-Williams
Keyword(s):  
Technical Note

scholarly journals Probabilistically assessing the role of nutrient loading in harmful algal bloom formation in western Lake Erie

2016 ◽  
Vol 42 (6) ◽  
pp. 1184-1192 ◽  
Author(s):  
Isabella Bertani ◽  
Daniel R. Obenour ◽  
Cara E. Steger ◽  
Craig A. Stow ◽  
Andrew D. Gronewold ◽  
...  
Keyword(s):  
Lake Erie ◽  
Nutrient Loading ◽  
Algal Bloom ◽  
Harmful Algal Bloom ◽  
Western Lake ◽  
Bloom Formation ◽  
Western Lake Erie

scholarly journals The Role of Planktonic Algae in the Ecological Assessment of Storage-Reservoirs of the ILI-Balkhash Basin

2018 ◽  
Vol 20 (2) ◽  
pp. 1-14 ◽  
Author(s):  
Sophia Barinova ◽  
Elena Krupa ◽  
Sophia Romanova
Keyword(s):  
Aquatic Ecosystems ◽  
Nutrient Loading ◽  
Algal Cell ◽  
Cell Mass ◽  
Organic Pollution ◽  
Shannon Index ◽  
Storage Reservoirs ◽  
Phytoplankton Communities ◽  
Plankton Communities

Abstract The largest wastewater treatment systems include Sorbulak and Kurty reservoirs, and the small storage ponds were studied in the summer of 2017 and characterized mainly by organic pollution. Phytoplankton communities were represented by species tolerant of organic and toxic pollution. Cyanobacteria dominated in the reservoirs, and dinophyte algae were only in the Kurty Reservoir. According to the results of CCA analysis, only Cr and certain nutrients had a significant effect on the abundance of algae. A statistically positive significant association between the Shannon index and the average algal cell mass was established. The results obtained are a particular example reflecting the non-linearity of changes in plankton communities in the gradient of nutrient loading and eutrophication of aquatic ecosystems.

scholarly journals Technical note: On comparing greenhouse gas emission metrics

2021 ◽  
Vol 21 (6) ◽  
pp. 4699-4708
Author(s):  
Ian Enting ◽  
Nathan Clisby
Keyword(s):  
Global Warming ◽  
Greenhouse Gas ◽  
Global Warming Potential ◽  
Radiative Forcing ◽  
Greenhouse Gas Emission ◽  
Technical Note ◽  
Short Term ◽  
Rates Of Change

Abstract. Many metrics for comparing greenhouse gas emissions can be expressed as an instantaneous global warming potential multiplied by the ratio of airborne fractions calculated in various ways. The forcing equivalent index (FEI) provides a specification for equal radiative forcing at all times at the expense of generally precluding point-by-point equivalence over time. The FEI can be expressed in terms of asymptotic airborne fractions for exponentially growing emissions. This provides a reference against which other metrics can be compared. Four other equivalence metrics are evaluated in terms of how closely they match the timescale dependence of FEI, with methane referenced to carbon dioxide used as an example. The 100-year global warming potential overestimates the long-term role of methane, while metrics based on rates of change overestimate the short-term contribution. A recently proposed metric based on differences between methane emissions 20 years apart provides a good compromise. Analysis of the timescale dependence of metrics expressed as Laplace transforms leads to an alternative metric that gives closer agreement with FEI at the expense of considering methane over longer time periods. The short-term behaviour, which is important when metrics are used for emissions trading, is illustrated with simple examples for the four metrics.

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