Cited by 73Aquatic Ecosystems and Phytoplankton DynamicsMarine and coastal ecosystemsSoil and Water Nutrient Dynamics

Effects of hypolimnetic oxygenation on water quality in Amisk Lake, Alberta, a deep, eutrophic lake with high internal phosphorus loading rates

Prepas, E E, Burke, J M·1997·Canadian Journal of Fisheries and Aquatic Sciences

Abstract

Year-round injection of pure oxygen into the hypolimnion of one of two basins in Amisk Lake during 1988-1993 changed dissolved oxygen (DO) and nutrient concentrations in both lake basins without eliminating thermal stratification. Changes were greatest in the treated basin and during 1990-1993, when an upgraded injection system operated; injection rates of <<= 1.3 t · day-1increased mean summer hypolimnetic DO concentrations from 1.0 (1980-1987) to 4.6 mg ·L-1(1990-1993). Summer hypolimnetic DO depletion rates nearly doubled relative to the pretreatment period. Mean summer hypolimnetic total phosphorus (TP) concentrations decreased from 123 to 56 µg · L-1, despite low iron to phosphorus ratios near the sediments. Similarly, mean hypolimnetic ammonium concentrations declined from 120 to 42 µg ·L-1. Epilimnetic TP and chlorophyll a concentrations decreased to 87 and 45%, respectively, of pretreatment summer means. Oxygen consumption rates in the treated basin were lower in winter than in summer; injection rates of <<= 0.8 t ·d-1increased mean winter deepwater DO concentrations from 2.5 to 7.2 mg ·L-1. In winter, mean deepwater TP concentrations decreased from 96 to 51 µg ·L-1. Oxygenation enhanced deepwater circulation in the treated basin in summer and winter. No changes were seen in two other reference basins during the study period. The hypolimnetic oxygen injection technology developed at Amisk Lake can be a cost-effective management tool for lakes with high hypolimnetic ox…

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Crossref · 10.1139/f97-125

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  • Oxygenation has the advantages of more efficient oxygen transfer and less disturbance of the stratification regime, though noteworthy increases in vertical mixing compared to natural conditions do occur with oxygenation.

    “Oxygenation has the advantages of more efficient oxygen transfer and less disturbance of the stratification regime, though noteworthy increases in vertical mixing compared to natural conditions do occur with oxygenation (Prepas and Burke 1997).”

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Authors
Prepas, E. E., & Burke, J. M.
Venue
Canadian Journal of Fisheries and Aquatic Sciences
Published
1997-09-01
Volume
54
Issue
9
Pages
2111-2120
ISSN
  • 0706-652X (ISSN-L)
  • 1205-7533
OpenAlex
W2135107527
Cited by
73
References
41
Citations by year
2026: 1 · 2025: 3 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 4 · 2019: 2 · 2018: 2 · 2017: 2 · 2016: 4 · 2015: 2 · 2014: 3 · 2013: 4 · 2012: 1
FWCI
5.75
Type
journal article
Language
en
Open access
closed
Locations
Canadian Journal of Fisheries and Aquatic Sciences (publishedVersion)
Funders
  • Minnesota Pollution Control Agency
  • Directorate for Biological Sciences
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
Keywords
hypolimnetic oxygenation, oxygen injection, eutrophic lakes, internal phosphorus loading, dissolved oxygen depletion, thermal stratification, deep ocean circulation, ammonium, chlorophyll a, lake water quality management

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