MODELLING PHOSPHORUS EXCHANGE AT THE SEDIMENT WATER INTERFACE OF A BRACKISH WATER BAY

Marie Thouvenot-Korppoo*, Tuomo Karvonen, Juha Järvelä

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Phosphorus plays a key role in the eutrophication of coastal waters. Despite this widespread agreement, its release mechanisms from the sediments (internal loading) still remain unclear. Phosphorus is present in the environment under various forms more or less refractory that can be classified as e. g. labile, organic phosphorus, redox-sensitive phosphorus and refractory. In northern Europe, the redox-sensitive part is significant and can play an important role in the release of phosphorus from the sediments. In this study, we presented our preliminary results on the modelling of phosphorus processes in the sediments of a small brackish bay of the Baltic Sea (Finland). The mechanisms controlling phosphorus concentrations in the sediments of the bay and the release of phosphorus to the water column were identified as redox-conditions and iron and sulphur chemistry. In this study, we presented a new modelling approach to link the phosphorus cycle to the oxygen, iron and sulphur cycles in the sediments. The new formulation allowed for the representation of the exchange processes between the sediments and the water concerning the three most reactive forms of phosphorus (dissolved, redox-sensitive and organic). The new model successfully simulated the profiles of phosphate, sulphate, iron ions, iron-bound phosphorus and ammonium concentrations in the sediments. Without the herein introduced reactions linking phosphorus to the iron and sulphur cycles, the model could not reproduce the low concentrations of phosphate in the top sediments.

Original languageEnglish
Title of host publicationPROCEEDINGS OF THE XVIII INTERNATIONAL CONFERENCE ON COMPUTATIONAL METHODS IN WATER RESOURCES (CMWR 2010)
EditorsJ Carrera, SanchezVila, D FernandezGarcia, D Bolster
Pages966-973
Number of pages8
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Computational Methods in Water Resources - Barcelona, Spain
Duration: 21 Jun 201024 Jun 2010
Conference number: 18

Conference

ConferenceInternational Conference on Computational Methods in Water Resources
Abbreviated titleCMWR
CountrySpain
CityBarcelona
Period21/06/201024/06/2010

Keywords

  • Phosphorus
  • sediment
  • early diagenesis
  • modelling
  • EARLY DIAGENESIS
  • LAKE
  • TOOLONLAHTI
  • TRANSPORT
  • NITROGEN
  • FINLAND
  • SURFACE
  • CARBON
  • OXYGEN

Cite this