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Sara Sandström

Sara Sandström
My PhD project aims at increasing the understanding of the composition, role and sources to suspended material and attached phosphorus (P) in small agricultural streams. The project will consist of field- and labwork as well as improved modeling of P-exchange between sediment and water phase and identification of critical source areas (CSAs) for P-transport with distributed high-resolution erosion models.

Presentation

I am a PhD student at the Department of aquatic sciences and assessment and  belong to the section for geochemistry and hydrology. My main focus is phosphorus (P) attached to suspended material in small agricultural streams. Besides my own project, my special interests lies in working with different Geographical information systems (GIS) and automatisation of GIS-calculations in Python.

Research

Elevated P-concentrations in surface waters is a known contributor to eutrophication and degraded water quality, where agriculture is a known main P-source. However, the role and composition of fluvial sediment and attached P is less known. Through this project we want to increase the understanding for these processes with improved modeling of P-exchange between sediment and water phase and identification of CSAs for P-transport with distributed high-resolution erosion models as well as field and labwork that looks closer at the suspended material and the different P-fractions attached to it.

The first part of the project concerns field and labwork where suspended material is collected from small agricultural streams in four different agricultural catchments with time integrated Philippes samplers. All these areas are a part of the Swedish national environmental monitoring program. The samplers are emptied and reinstalled once a month, and the material is analyzed with P-fractionation to find the different P-species. The material will also be analyzed using NMR and XANES-analysis later in the project with help from our collaboration partners on Ireland and Canada. This to get even deeper understanding of the different P-species in the material.

The second part of the project will be based on historical time-series data from these small agricultural catchments that are a part of the Swedish environmental monitoring programme. We will mainly look at the connection between particluate P and the concentration of suspended material and how this can be linked to the catchment's properties, e.g. soil type.

The last parts of the project will be focused on modeling where we will continue to build on the results from the lab and field experiments to improve the modeling of P-exchange between sediment and water phase. We will also further develop distributed high-resolution erosion models to identify CSAs for P-transport.

Background

Master programme in Environmental and Water Engineering, Uppsala University (2012-2017).

Supervision

Main supervisor: Faruk Djodjic, Department of Aquatic Sciences and Assessment, SLU.

Martyn Futter, Department of Aquatic Sciences and Assessment, SLU.

Kevin Bishop, Department of Aquatic Sciences and Assessment, SLU.

Katarina Kyllmar, Department of Soil and Environment, SLU.


Contact
Doctoral Student at the Department of Aquatic Sciences and Assessment; Section for Geochemistry and Hydrology
Postal address:
Institutionen för vatten och miljö
Box 7050
750 07 UPPSALA
Visiting address: Lennart Hjelms väg 9, Uppsala