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<p>In aquatic ecosystems, sediments act as long-term nutrient reservoirs that play a&#xa0;key role in regulating biogeochemical cycles and, consequently, primary production. These nutrient dynamics are sensitive to environmental changes, particularly those caused by anthropogenic pollution and climate change, which can destabilise the ecological balance through increased nutrient release (eutrophication). This study addresses this challenge using the example of the artificial, eutrophic Lake Altmühl in Germany. The research employs an integrated methodological approach that combines the following: 1)&#xa0;freeze cores to characterise sediment stratigraphy and quantify the chemical speciation of phosphorus, 2)&#xa0;continuous monitoring of physical parameters (temperature, oxygen, pH at different depths) and 3)&#xa0;2D hydrodynamic modelling to simulate flow conditions under varying discharge rates.</p><p>Initial results indicate a&#xa0;strong coupling between these processes: the observed thermal stratification leads to daily oxygen depletion near the sediment-water interface, which in turn promotes the release of phosphorus from the sediments. This is considered to be a&#xa0;major driver of cyanobacterial blooms and declining water quality. Furthermore, hydrodynamic modelling shows that flow patterns greatly influence sediment transport and nutrient mobilisation. In summary, this project demonstrates that a&#xa0;holistic, multidisciplinary approach is essential for the development of effective, sustainable management strategies capable of restoring the resilience of aquatic ecosystems in the face of increasing pressure from pollution and climate change.</p>

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Nährstoffgebundene Sedimente in Zeiten des Klimawandels: Monitoring und naturbasierte Lösungen für Oberflächengewässer

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年6月30日

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  • Peter Flödl,
  • Hemma Smolka,
  • Finn Schöler,
  • Christoph Hauer

摘要

In aquatic ecosystems, sediments act as long-term nutrient reservoirs that play a key role in regulating biogeochemical cycles and, consequently, primary production. These nutrient dynamics are sensitive to environmental changes, particularly those caused by anthropogenic pollution and climate change, which can destabilise the ecological balance through increased nutrient release (eutrophication). This study addresses this challenge using the example of the artificial, eutrophic Lake Altmühl in Germany. The research employs an integrated methodological approach that combines the following: 1) freeze cores to characterise sediment stratigraphy and quantify the chemical speciation of phosphorus, 2) continuous monitoring of physical parameters (temperature, oxygen, pH at different depths) and 3) 2D hydrodynamic modelling to simulate flow conditions under varying discharge rates.

Initial results indicate a strong coupling between these processes: the observed thermal stratification leads to daily oxygen depletion near the sediment-water interface, which in turn promotes the release of phosphorus from the sediments. This is considered to be a major driver of cyanobacterial blooms and declining water quality. Furthermore, hydrodynamic modelling shows that flow patterns greatly influence sediment transport and nutrient mobilisation. In summary, this project demonstrates that a holistic, multidisciplinary approach is essential for the development of effective, sustainable management strategies capable of restoring the resilience of aquatic ecosystems in the face of increasing pressure from pollution and climate change.