Presentation on theme: "Dr. Martin T. Auer MTU Department of Civil & Environmental Engineering CE5504 Surface Water Quality Modeling Lab 5. Sediment-Water Exchange The Recovery."— Presentation transcript:
Dr. Martin T. Auer MTU Department of Civil & Environmental Engineering CE5504 Surface Water Quality Modeling Lab 5. Sediment-Water Exchange The Recovery of Shagawa Lake, Minnesota: Sediment Mediation
Contaminant Association with Particulate Matter Biological Uptake Abiotic Adsorption
Onondaga Lake, NY depositional basin Depositional Basins
Diagenesis The sum total of processes that bring about changes in a sediment subsequent to deposition in water. Berner 1980
Shagawa Lake A mathematical model predicted that the lake would reach equilibirium P levels of 12 ppb in ~1.5 years. The fact that it didn’t was attributed to sediment P feedback, primarily during summer. Modification of the model to accommodate sediment P release matches post-treatment P levels well and indicates that P release has not been diminished since treatment went on line. Further recovery will depend on the time course of reductions in sediment feedback.