Eutrophication is an ongoing problem in many parts of the world, and considerable work has been done to understand field scale controls of phosphorus. However, in-stream processes as internal loading have been showed to be of high importance when trying to understand the full picture at catchment scale. This motivates the focus of this project, where sediment is regarded as a key to understand phosphorus dynamics in the Swedish agricultural landscape.
The major part of the work is done in Sävjaån, a mixed land use catchment close to Uppsala.
The project consists of three parts:
Use of high frequency in situ sensors (YSI OMS-VS/YSI EXO2-Sonde) collecting stream chemistry data every 10th minute over the whole year. Turbidity has been used as a proxy for total phosphorus, which improved the understanding of phosphorus transport and underlined the importance of storm events for the total load calculations.
Further investigation of hysteresis events with high frequency turbidity and discharge data will be done to enhance the understanding of sediment transport in the catchment.
Laboratory and field analyses of sediment will be done in the catchment where the phosphorus fractionation will be explored. To understand the role of the sediment as a sink or a source at different conditions the spatiotemporal variation in sorption isotherms will be described and quantified.
Process based modelling with INCA-P (Integrated Catchment Model) will be used for synthesizing field observations and laboratory results. The INCA family of catchment scale water quality models will be used to gain an improved understanding of the catchment scale controls on phosphorus transport, and to evaluate scenarios related to changes in climate and land use.
Department work: Potential of sensor technology in the Swedish National Surface water Monitoring Programme - deployment/installation, maintenance and data handling.
Bachelor of Science in Environmental Science, Linköping University (2008-2011). An interdiciplinary education, combining natural science and social science. My focus was environmental chemistry (analytical), environmental monitoring and the Environmental Code of Sweden. I did my internship at the Swedish Water Authority (Västerås). Bachelor thesis: Drained land and nutrient transport in the river Svärtaå catchment (2011)
Environmental consultant, worked with with permit applications and environmental impact assessments (2011-2014).
Master of Science in Environmental Science, Soil and Water Management at the Swedish University of Agricultural Sciences, Uppsala (2014 - 2016). The education focused on processes in soil and water seen from a landscape perspective. I did my internship at the Swedish Environmental Protection Agency, section of contaminated sites.
Main supervisor: Martyn Futter, Department of Aquatic Sciences and Assessment, SLU
Jens Fölster, Department of Aquatic Sciences and Assessment, SLU
Lisbet Lewan, Department of Soil and Environment, SLU
Elin Widén Nilsson, Department of Aquatic Sciences and Assessment, SLU
José Ledesma, Department of Aquatic Sciences and Assessment, SLU
Lannergård, E., Ledesma, J.L.J, Fölster, J., Futter, M.N., High frequency turbidity as a proxy for total phosphorus: potential application in a mixed land use catchment in Sweden (in preparation)