Long-term Water Quality Changes Following Timber Harvesting

Reservoir water for drinking water production may undergo major short-term and long-term quality changes. These are results of natural processes in the water body and of the water's quality entering and leaving the reservoir. Long term quality changes are due to management of catchment areas, but also to a considerable extent by external impacts like climate change. Short term quality changes are impacted by extreme events like rain storms after drought periods, which might also be a result of climate change. Furthermore, short- and mid-term quality changes are impacted by reservoir management, which also influences the ecological state of rivers downstream the reservoir. The purpose of our work is to develop a decision support tool for reservoir management which takes into account short-, mid- and long-term factors for water quality change. With the tool it is intended to simulate not only water quality, but also management impact on flood risk prevention and drinking water quality (treatment efficiency and costs) and to assist decision making for reservoir management.

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Management measures and long-term water quality changes in Lake Balaton (Hungary)

Fundamental and Applied Limnology / Archiv für Hydrobiologie ◽

10.1127/1863-9135/2008/0172-0001 ◽

2008 ◽

Vol 172 (1) ◽

pp. 1-11 ◽

Cited By ~ 14

Author(s):

István Tátrai ◽

Vera Istvánovics ◽

László-G. Tóth ◽

István Kóbor

Keyword(s):

Water Quality ◽

Lake Balaton ◽

Quality Changes ◽

Management Measures

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Paleolimnological assessment of long-term water-quality changes in south-central Ontario lakes affected by cottage development and acidification

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f95-171 ◽

1996 ◽

Vol 53 (1) ◽

pp. 1-17 ◽

Cited By ~ 95

Author(s):

Roland I Hall ◽

John P Smol

Keyword(s):

Water Quality ◽

Quality Changes ◽

South Central ◽

Cottage Development

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Long‐term water quality changes in ramsey lake (Sudbury, Canada) as revealed through paleolimnology

Journal of Environmental Science and Health Part A Environmental Science and Engineering and Toxicology ◽

10.1080/10934529609376398 ◽

1996 ◽

Vol 31 (4) ◽

pp. 941-956 ◽

Cited By ~ 3

Author(s):

Aruna S. Dixit ◽

Sushil S. Dixit ◽

John P. Smol

Keyword(s):

Water Quality ◽

Quality Changes

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Water quality changes in south-central Ontario lakes and the role of local factors in regulating lake response to regional stressors

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f2011-041 ◽

2011 ◽

Vol 68 (6) ◽

pp. 1038-1050 ◽

Cited By ~ 36

Author(s):

Michelle E. Palmer ◽

Norman D. Yan ◽

Andrew M. Paterson ◽

Robert E. Girard

Keyword(s):

Water Quality ◽

Acidic Deposition ◽

Quality Parameters ◽

Quality Changes ◽

South Central ◽

Chloride Water ◽

Long Term Monitoring ◽

Term Monitoring

The long-term monitoring of eight lakes near Dorset, Ontario, indicates that the water quality has changed significantly over the last 30 years. However, trends in the Dorset lakes may not be representative of changes in other south-central Ontario lakes, as the Dorset lakes are within a small area and span a limited gradient of lake and watershed characteristics. To determine the regional extent of water quality changes, we assessed the chemical changes in 36 diverse lakes that were first sampled between 1981 and 1990 and were resampled in 2004–2005. Similar to trends in the Dorset lakes, changes in the regional lakes included decreasing acidity, calcium, conductivity, metals, and phosphorus, and increasing dissolved organic carbon, nitrogen, sodium, and chloride. Water quality changes were driven by regional stressors, including acidic deposition, climate, and lakeshore residential development. However, stressor-induced responses differed among lakes. Increases in sodium and chloride were greater in developed lakes that were close to winter-maintained roads. Site-specific characteristics, such as lake and watershed morphometry, could not explain heterogeneous changes in the remaining water quality parameters. These results indicate that other factors play an important role in regulating individual lake response to regional stressors.

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