Nutrient exchange and release experiment and its simulation study in lake water-sediment interface

Area of Science:

• Environmental Science
• Limnology
• Geochemistry

Background:

• Lake sediment nutrient profiles and physical-chemical properties are critical for water quality assessment.
• Understanding sediment-water interactions is key to managing lake eutrophication.

Purpose of the Study:

• To analyze nutrient distribution in lake sediment.
• To simulate and assess the impact of sediment nutrient release on lake water quality.
• To model nutrient exchange at the water-sediment interface.

Main Methods:

• Collection and analysis of lake sediment samples.
• Dynamic water exchange experiments to study nutrient release.
• Development of a simulation model for nutrient dynamics.

Main Results:

• Vertical nutrient distribution in sediment causes significant nutrient release, especially during organic-to-inorganic conversion.
• Even clean water exchange cannot prevent increased nutrient release from sediment.
• Modeled nutrient release of total phosphate (TP) and total nitrogen (TN) predicts sustained high levels in overlying water.

Conclusions:

• Sediment nutrient release is influenced by overlying water concentration and accumulation time.
• Findings provide a basis for lake ecological restoration and eutrophication management.
• The study highlights the challenge of preventing eutrophication due to inherent sediment nutrient loads.