Tim Clark King County Department of Natural Resources Water and Land Resources Division Impacts of Saltwater Intrusion into an Urban Freshwater Lake.

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Presentation transcript:

Tim Clark King County Department of Natural Resources Water and Land Resources Division Impacts of Saltwater Intrusion into an Urban Freshwater Lake

Lake Union/Ship Canal - Yesterday

Lake Union/Ship Canal - Today

Following Ship Canal Construction Level of Lake Washington dropped by 8.8 ft (2.7 m) Lake Washington’s outlet switched from the Black River to the Montlake Cut Due to lockages, saltwater could now enter Salmon Bay, Lake Union, and even Lake Washington Tactics to prevent intrusion: Saltwater drain (improved pumping in late ‘50s) Dredging Barrier (1966)

What’s the Problem with Salt? How does it get in? Up-lockages mix marine water from Shilshole Bay with freshwater from Lake Union When does it get into Lake Union and Lake Washington? High lockages Low inflow and runoff (Summer months)

Lake Union/Ship Canal - Today

1985 – 2015 Salinity King County site in SW Lake Union (A522) – max depth: 16 m

What Happened in 2014? Army Corps False Lockings Experiment Lake Union is too warm for migrating salmon in summer (>20°C) Cool Salmon Bay with cooler marine water (~14°C) How? Increase the number of lockages Lower the barrier Turn off the saltwater drain Essentially, undo all the measures made to prevent the intrusion.

What’s the Problem with Salt? It just sits there…

What’s the Problem with Salt? Extended anoxic and acidic period for near-bottom water Extended release and build-up of nutrients near bottom Potential contaminated sediment resuspension

Increased Period of Hypoxia Days hypoxic calculated as first day of summer hypoxia observed through last day hypoxia (may include the following year)

What’s the Problem with Salt? Extended anoxic and acidic period for near-bottom water Extended release and build-up of nutrients near bottom Potential contaminated sediment resuspension

3.74 mg/L mg/L 4.84 mg/L mg/L

What’s the Problem with Salt? Extended anoxic and acidic period for near-bottom water Extended release and build-up of nutrients near bottom Potential resuspension of contaminated sediments

In saltwater layer (compared to surface waters), we observed Increased levels of PAHs Increased levels of TSS Due to internal seiching? Due to slowed settling? What’s the Problem with Salt?

Sediment Contamination

What’s the Problem with Salt? It doesn’t just sit there… Animations from University of Waterloo

What’s the Problem with Salt? It doesn’t just sit there… NNW

Outcomes of 2014/15 Saltwater Intrusion As of latest sampling (September), turnover has not occurred Army Corps data suggests whole-lake mixing occurred in early October during storm event. Army Corps do not plan on turning off the saltwater drain Did not find substantial temperature decreases May complete locking to cause mixing and increase bottom DO if sensors indicate hypoxia

QUESTIONS?