Water quality, phosphorus input reductions, analytical methods and lake internal/self-purification measures: A case study of lake Frøylandsvatn, Norway |
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| Authors: | Jon Lasse Bratli |
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| Institution: | Norwegian Institute for Water Research, P.O. Box 173, Kjelsas, 0411, Oslo, Norway |
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| Abstract: | Lake Frøylandsvatn is a shallow eutrophic lake which has frequent blooms of various species of blue-green algae, often producing toxins. The lake receives heavy nutrient loads, mainly from agriculture, as well as a large internal load from its own sediments. It also shows several signs of being an unbalanced ecosystem. It has been calculated that phosphorus and chlorophyll levels need to be reduced by approximately 50% to improve the water quality enough for swimming. The analysis presented here makes it possible to compare the cost-effectiveness of different measures, including both catchment area and lake-internal methods. In addition to conventional means of reducing phosphorus pollution caused by agricultural activities and sewage, other measures, including biomanipulation and self-purification processes through artificial ponds and wetlands, will be necessary to achieve the ambitious goal that has been set. |
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