Dr. Martin T. Auer MTU Department of Civil & Environmental Engineering CE5504 Surface Water Quality Modeling Lab 7. Sediment-Water Exchange Sediments Mediation.

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Presentation transcript:

Dr. Martin T. Auer MTU Department of Civil & Environmental Engineering CE5504 Surface Water Quality Modeling Lab 7. Sediment-Water Exchange Sediments Mediation of the Recovery of Shagawa Lake, Minnesota

Depositional Basins Onondaga Lake, NY depositional basin

Sediment Diagenesis diagenesis – redox reactions depositionflux

Redox Mediation oxic conditions; sparingly soluble anoxic conditions; highly soluble

Phosphorus Release Rates

Phosphorus Accumulation in the Hypolimnion

Engineered Approaches 1. Sediment Removal (Dredging) 2. Hypolimnetic Withdrawal 3. Chemical Inactivation 4. Artificial Circulation 5. Hypolimnetic Aeration 6. Sediment Oxidation Support Raft Gas Vent Support Cables Contact Chamber Air Line & Diffuser Ballast

Natural Recovery – The Slow Eigenvalue old SS new SS concentration time for the sediment for the water column

Diagenesis and Recovery – Part I

Diagenesis and Recovery – Part II

Diagenesis and Recovery – Part III

Modeling Sediment – Water Interactions 8 load outflow deposition release burial

The Limiting Nutrient Concept The Supplies The Product

The Limiting Nutrient Controversy

Shagawa Lake

eutrophic system tertiary treatment installed in 1973 load reduction of 80%

Shagawa Lake The (un)response

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.