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https://doi.org/10.5194/hess-2020-34
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2020-34
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Feb 2020

Submitted as: research article | 26 Feb 2020

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This preprint is currently under review for the journal HESS.

Drivers of nitrogen and phosphorus dynamics in a groundwater-fed urban catchment revealed by high frequency monitoring

Liang Yu1,2, Joachim C. Rozemeijer3, Hans Peter Broers4, Boris M. van Breukelen5, Jack J. Middelburg6, Maarten Ouboter2, and Ype van der Velde1 Liang Yu et al.
  • 1Faculty of Science, Vrije University Amsterdam, 1181HV, Amsterdam, the Netherlands
  • 2Waternet Water Authority, 1096 AC, Amsterdam, the Netherlands
  • 3Deltares, 3508 TC, Utrecht, the Netherlands
  • 4TNO Geological Survey of the Netherlands, 3584 CB, Utrecht, the Netherlands
  • 5Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN, Delft, the Netherlands
  • 6Department of Earth Sciences, Faculty of Geosciences, Utrecht University, P.O. Box 80 021, 3508 TA, Utrecht, the Netherlands

Abstract. Eutrophication of water bodies has been a problem causing severe degradation of water quality in cities. To gain mechanistic understanding of the temporal dynamics of nitrogen and phosphorus in a groundwater fed low-lying urban polder, we applied high frequency monitoring in Geuzenveld, a polder in the city of Amsterdam. The high frequency monitoring equipment was installed at the pumping station where water leaves the polder. From 2016 March to 2017 June, total phosphorus (TP), ammonium (NH4), turbidity, electrical conductivity (EC), and water temperature were measured at intervals smaller than 20 minutes. This paper discusses the results at three time scales: annual scale, rain event scale, and single pumping event scale. Mixing of upwelling groundwater and runoff was the dominant hydrological process and governed the temporal pattern of the EC, while N and P fluxes from the polder were also significantly regulated by primary production and iron transformations. The mixing of groundwater and runoff water governed water quality through variation of the intensity and duration of the events. For NH4, the dominant form of N in surface water originating from groundwater seepage, we observed low concentrations during the algae growing season, while concentrations were governed by mixing of groundwater and precipitation inputs in the late autumn and winter. The depletion of dissolved NH4 in spring suggests uptake by primary producers, consistent with high chlorophyll-a, O2, and suspended solids during this period. Total P and turbidity were high during winter, due to the release of reduced iron and P from anoxic sediment to the water column. Rapid Fe2+ oxidation in the water column is the major cause of turbidity. In the other seasons, P is retained in the sediment by iron oxides. Nitrogen is exported from the polder to the downstream water bodies throughout the whole year, mostly in the form of NH4, but as organic N in spring. P leaves the polder mainly during winter, primarily associated with Fe(OH)3 colloids and as dissolved P. Based on this new understanding of the dynamics of N and P in this low lying urban catchment, it is possible to formulate management strategies that can effectively control and reduce eutrophication situation in urban polders and receiving downstream waters.

Liang Yu et al.

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The assessment of the collected water quality information is for the managers to find a way to improve the water environment to satisfy human uses and environmental needs. We found the groundwater containing high concentration of nutrients mixes with rain water in the ditches. The stable solutes are diluted during rain. The change of nutrients over time is determined by uptaken by organisms and chemical processes. The water is more enriched with nutrients and looked more dirty during winter.
The assessment of the collected water quality information is for the managers to find a way to...
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