Temporal and spatial variability in concentrations of phosphorus species under thermal pollution conditions of a dam reservoir – the Rybnik Reservoir case study

  • Maciej Kostecki, Malwina Tytła, Joanna Kernert, Katarzyna Stahl
  • Archives of Environmental Protection, January 2017, De Gruyter
  • DOI: 10.1515/aep-2017-0022

Variability of phosphorus species under thermal pollution conditions of a dam reservoir

What is it about?

The research objective was to study temporal and spatial relations between specific phosphorus species as well as to examine total phosphorus content in the bottom sediments of an anthropogenic, hypertrophic limnic ecosystem Rybnik Reservoir, functioning under thermal pollution conditions. The chemical extraction procedure for the speciation of bioavailable phosphorus forms was used. It was found that available algae phosphorus was the most dominant phosphorus species in both sediment layers (83%), while the lower share was readily desorbed phosphorus form (0.1%). It was indicated that the speed of the phosphorus species transformations was affected by the environment temperature. In the heated water discharge zone (water temp. 17–35°C) the concentrations of selected speciation phosphorus forms increased more than in the dam zone (5–25°C).

Why is it important?

The spatial thermal diversification of the water masses affected the intensity of the phosphorus transformations. In the heated water discharge zone, the transformation intensity was by approx. 35% higher than in the dam zone. The assessment of the general abundance of the bottom sediments with phosphorus compounds and determination of the proportion between the element species can be based on the mean values and is approximate. It was indicated that the speed of the phosphorus species transformations was affected by the environment temperature. In the heated water discharge zone (water temp. 17–35°C) the concentrations of selected speciation phosphorus forms increased more than in the dam zone (5–25°C).

Perspectives

Malwina Tytła
INSTITUTE OF ENVIRONMENTAL ENGINEERING POLISH ACADEMY OF SCIENCES in Zabrze

The aim of the limnological engineering is to define the threats and search for methods for the limnic ecosystem protection and reclamation. Therefore, various elements affecting phosphorus speciation in the bottom sediments (i.e. hydrological conditions, morphometric conditions of a lowland dam reservoir, including oblong and transverse depth asymmetry, changing quality of the supplying water) indicate the necessity to apply a research methodology that takes all these aspects into account

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http://dx.doi.org/10.1515/aep-2017-0022

The following have contributed to this page: Malwina Tytła