Estimation of the Share of Total Nutrient Load from the Territory of Estonia along the Narva River to the Baltic Sea †
1
Department of Civil Engineering and Architecture, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
2
Department of Energy Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia
*
Author to whom correspondence should be addressed.
†
Presented at the International Conference EcoBalt 2023 “Chemicals & Environment”, Tallinn, Estonia, 9–11 October 2023.
Proceedings 2023, 92(1), 44; https://doi.org/10.3390/proceedings2023092044
Published: 24 November 2023
(This article belongs to the Proceedings of International Conference EcoBalt 2023 "Chemicals & Environment")
The annual inputs of nitrogen and phosphorus by the Narva river into the Baltic Sea are distributed between Estonia and Russia according to the catchment area shares of 33% and 67%, respectively [1]. A comparison of the total nutrient load shows that the proportion between countries may vary depending on what input data and estimation methods are used. The aim of this study was to improve the comparability of estimates in order to obtain more accurate information on the distribution of nutrients from Estonia. The results were obtained from the testing of the Estonian and Russian calculated methods [2] and initial data for the period 2006–2018, as well as the distribution of sources calculated for the direct catchment area of the transboundary Narva River. Detailed calculations for each sub-basin were carried out using mainly national coefficients. A comparison of the calculated total input with the monitoring data showed that both countries’ estimates of nitrogen and phosphorus loads correlated quite well with the monitoring data. The main sources of Ntot in the immediate catchment were point sources and agriculture. The main difference was in the Ptot input from natural and urban areas and agriculture. Therefore, point sources, agriculture and runoff from urban areas can be considered the priority sources. According to the results obtained for the Estonian territory, the contribution of Ntot was 23% and that of Ptot was 29% [3].
Author Contributions
Conceptualization and methodology, A.R.; formal analysis, A.R. and K.R.; data curation, A.R. and K.R.; writing—original draft preparation, A.R.; project administration, A.R. All authors have read and agreed to the published version of the manuscript.
Funding
This research (Project Water Management of the Narva River: Harmonization and Sustention) is implemented under the European Neighbourhood Instrument and co-financed by the European Union (https://estoniarussia.eu/ (accessed on 1 September 2023)). This study was conducted at Taltech with project IDV19016.
Institutional Review Board Statement
Not applicable.
Informed Consent Statement
Not applicable.
Data Availability Statement
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to its being a part of the project activity and it wasn’t planned to grant public access.
Acknowledgments
The authors acknowledge the assistance of the Estonian EU external border programme for 2014–2020 and it’s the project partners for their contribution.
Conflicts of Interest
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.
References
- HELCOM, 2018. The Sixth Pollution Load Compilation (PLC-6). Available online: https://helcom.fi/wp-content/uploads/2019/08/PLC-6-Executive-Summary.pdf (accessed on 31 October 2020).
- Applied Methodology for the PLC-6 Assessment Edited by Lars M. Svendsen, DCE Aarhus University, PLC-6 Project Manager, 60p. Available online: https://helcom.fi/wp-content/uploads/2020/01/PLC-6-methodology.pdf (accessed on 15 December 2021).
- Water Environmental Engineering Research Group. Narva Wat Man Project; Final Report; Taltech: Tallinn, Estonia, 2022. [Google Scholar]
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MDPI and ACS Style
Reihan, A.; Roosalu, K. Estimation of the Share of Total Nutrient Load from the Territory of Estonia along the Narva River to the Baltic Sea. Proceedings 2023, 92, 44. https://doi.org/10.3390/proceedings2023092044
AMA Style
Reihan A, Roosalu K. Estimation of the Share of Total Nutrient Load from the Territory of Estonia along the Narva River to the Baltic Sea. Proceedings. 2023; 92(1):44. https://doi.org/10.3390/proceedings2023092044
Chicago/Turabian StyleReihan, Alvina, and Kati Roosalu. 2023. "Estimation of the Share of Total Nutrient Load from the Territory of Estonia along the Narva River to the Baltic Sea" Proceedings 92, no. 1: 44. https://doi.org/10.3390/proceedings2023092044
