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Assessment of pollution state of Beira Lake in Sri Lanka using water quality index, trophic status, and principal component analysis

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Abstract

Beira Lake, in the heart of Colombo City in Sri Lanka, is a prominent landmark, serving a variety of important services such as flood control, and providing habitat and nesting grounds for the city’s wildlife. During the past decades, Beira Lake has become highly polluted due to anthropogenic activities. The majority of the past restoration attempts failed, revealing a lack of understanding of the pollutant intricacies. The objective of this study is to investigate the trophic status of all four basins of the lake to investigate the pollution status. Thirty-nine sampling locations were randomly selected based on a 100 × 100 m grid covering the entire lake for water quality sampling. Water quality index (WQI) and trophic level index (TLI) were calculated to further investigate the pollution scenarios. WQI, total nitrogen, total phosphorous, Secchi depth, and Chlorophyll-a were considered to calculate the TLI of the lake. As per the WQI, more than 93% of the lake’s surface area is in poor condition. The TLI reveals the hypereutrophic status of the lake water. According to principal component analysis, eutrophication and algal bloom index observed can be due to the heavy anthropogenic activities and land use patterns around the catchment indicating a high possibility of untreated effluent entering the lake through the active inlets. The effluent entering the lake should be managed immediately to prevent further deterioration of the entire lake. Immediate restoration of the lake is recommended, as the hypereutrophic state may lead to irreversible an imbalance in the lake ecosystem.

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Availability of data and materials

The data and materials used in this study are available upon request.

Abbreviations

BOD5 :

Biochemical oxygen demand

CEA:

Central Environmental Authority

Chl-a:

Chlorophyll-a

COD:

Chemical oxygen demand

DO:

Dissolved oxygen

EC:

Electrical conductivity

PC:

Principal component

PCA:

Principal component analysis

TDS:

Total dissolved solids

TLI:

Trophic level index

TSI:

Trophic state index

WQI:

Water quality index

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Acknowledgements

The authors would like to acknowledge the support extended by the Sri Lanka Land Development Corporation for the support extended toward this study in numerous ways.

Funding

This research did not receive any funding.

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Authors

Contributions

DD contributed to field visits, sample collection and laboratory analyses of water quality, data analysis and writing the manuscript. RG was involved in field visits, sample collection and laboratory analyses of water quality, data analysis and writing the manuscript. SH contributed to field visits, sample collection, and data analysis and writing the manuscript. SK contributed to field visits, data analysis, review and writing the manuscript. BA was involved in field visits, data analysis, review and writing the manuscript.

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Correspondence to Shiromi Karunaratne.

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Dharmarathna, D., Galagedara, R., Himanujahn, S. et al. Assessment of pollution state of Beira Lake in Sri Lanka using water quality index, trophic status, and principal component analysis. Aquat Ecol 58, 159–174 (2024). https://doi.org/10.1007/s10452-023-10052-8

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  • DOI: https://doi.org/10.1007/s10452-023-10052-8

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