Modeling point and non-point nutrient fluxes in river systems of lake Peipsi drainage basi
DOI:
https://doi.org/10.15626/Eco-Tech.2003.047Keywords:
Waste water treatment; Modeling nutrient fluxes; Nutrient source apportionment.Abstract
N and P compounds work as key elements causing bioproduction and eutrophication in
water bodies of the Baltic Sea region, A large-scale dynamic GIS-embedded PolFlow
model considers all point and diffuse emission sources in a river basin simulating also
transport and retention of nutrients in time steps of five years, This modeling approach
was originally developed for simulating past and present nutrient loads for the Rhine and
Elbe rivers. In addition, a statistical model MESAW was employed for nutrient source
apportionment and emission estimations. This paper analysis the modeling results in Lake
Peipsi basin, shared by Estonia, Russia and Latvia, for long-term trends since 1985 till
1999. Results of modeling, as well as monitoring data indicate quite stable long-term P
load while agricultural N load has decreased significantly in connection with dramatic
changes in agricultural structures. That, in turn, has lead to sharp decrease ofN/P ratio in
riverine runoff while in lakes (L Peipsi, L Vortsjii.rv) and coastal seas, NIP ratio has
dropped below 10. These changes, enhancing cyanobacterial blooms, have significantly
worsened the ecological state of these water bodies, in the conditions of decreased
emissions. The paper concludes that wastewater treatment should focus on better removal
ofphosphorus.
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References
Behrendt, H., 1993. Separation of point and diffuse loads of pollutants using monitoring data of rivers. Water Science and Technology 28, 165-175.
De Wit, M., 1999. Nutrient fluxes in the Rhine and Elbe basins. PhD thesis, Faculty ofGeographical Sciences, Utrecht University, Netherlands Geographical Studies 259.
De Wit, M.J.M., 2001. Nutrient fluxes at the river basin scale. I: the PolFlow model. Hydrological Processes, 15, 743-759. https://doi.org/10.1002/hyp.175
Grimvall, A. and Stålnacke, P., 1996. Statistical methods for source apportionment of riverine loads of pollutants. Environmetrics 7: 201-213. https://doi.org/10.1002/(SICI)1099-095X(199603)7:2<201::AID-ENV205>3.0.CO;2-R
Kangur, K., Kangur, A., Haberman, J., Haldna, M., Kangur, P., Laugaste, R., Milius, A., Miiemets, H., Mols, T., 2003. 7.1. Water quality assessment. In: Noges, T. (ed.). Final report on the relevant system of indicators and criteria for evaluating the ecological status of a very large nonstratified lake and its river basin in WFD context. Unpublished.
Langaas, S. (ed.), 2002. MANTRA-East Narva river / Lake Peipsi catchment multi-thematic GIS database. www.imantraeast.iorg/gis
Langaas, S., Hannerz, F, Nilsson, S., Tian, Y., Jouravkova, O., Tomingas, O, Mourad, D., Vasiliev, A., Skakalsky, B., Stalnacke, P., 2003. The multi-thematic transboundary Narva river / Lake Peipsi catchment GIS database: what, why, how, and beyond. Abstract accepted for the 7th International Conference on Diffuse Pollution and Basin Management, Dublin, 1 7-22 August 2003.
Loigu, E., Leisk, D., !ital, A., Hannus, M., Vassiljev, A., Blinova, I., 2001. Water quality and pollution load of the rivers of the L. Peipsi basin. In: Lake Peipsi Meteorology Hydrology Hydrochemistry. (Ed. By T. Noges). Tartu 2001, Sulemees, 73-96.
Mourad, D.S.J. and Van der Perk, M., 2002. Modelling nutrient fluxes from diffuse and point emissions to river loads: the Estonian part of the transboundary Lake Peipsi / Chudskoe drainage basin (Russiai/ Estoniai/ Latvia). Proceedings 397 6th International Conference on Diffuse Pollution, Amsterdam, 30 September - 4 October 2002, 259-266.
Rekolainen, S., 1989. Phosphorus and nitrogen load from forest and agricultural areas in Finland, Aqua Fennica 19,2, 95-107.
Salo, S., Ekholm, P., and Knuuttila, S., 1997. A comparison of methods for nutrient source apportionment in Nordic rivers. 16-17.
Vassiljev, A., Stalnacke, P., 2003. Source apportionment of nutrients in the Estonian part of the Lake Peipsi drainage basin - experiences from a statistical
model. In: Proceedings of Diffuse Pollution and Basin Management Conference (DipCon), Dub
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