Impact of Power Extraction on the Florida Current/Gulf Stream System: New Results Alexandra Bozec 1, Eric Chassignet 1, Howard P. Hanson 2 1 Center for.

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Impact of Power Extraction on the Florida Current/Gulf Stream System: New Results Alexandra Bozec 1, Eric Chassignet 1, Howard P. Hanson 2 1 Center for Ocean-Atmospheric Prediction Studies, Tallahassee, FL 2 Center for Ocean Energy Technology, Florida Atlantic University, Dania Beach, FL, USA

Objectives of the Project to assess the power availability in the Florida Current in the Fort Lauderdale region. to assess the impact of turbines on the Florida Current/Gulf Stream system

Total Power Availability (GW) Total Power Availability (GW): 1GW = 10 9 W ≈ 1 Nuclear Power Plant Power Density (W/m 2 ): or Rotor minimum Operating Speed 18 GW available 10 GW available Best efficiency : Only ~ 60% of the energy can be captured 10.8 GW available 6 GW available

Tools to assess the power availability in the Florida Current  Global 1/12º resolution (~8 km) assimilated simulations of the HYbrid Coordinates Ocean Model (HYCOM) (Hanson et al., 2011, EOS Trans. AGU, 92(4), ) to assess the impact of turbines on the Florida Current/Gulf Stream system (circulation, transport, power and energy)  Atlantic Ocean 1/12º resolution HYCOM simulations (no assimilation)

Atlantic Ocean Configuration Atlantic configuration of HYCOM (ATLg0.08):  1/12º horizontal resolution (~7-8km)  32 hybrid layers  Climatological initial conditions (T,S) from GDEM3  Climatological atmospheric forcing from ERA40  Start from a 10 year spin-up (Courtesy of X. Xu)

Turbine parameterized as a drag : with C T =0.1 Experimental Set-up  4 Simulations of 3 years :  control simulation (CONTROL)  4 turbines at 25.7ºN (TURB_C T =0.1)  12 turbines across the 25.7ºN section (TURB_C T =0.1_WALL1)  wall of turbines across the 25.7ºN section over 12 layers (TURB_C T =0.1_WALL12)

Impact of the turbines at 25.7ºN WE WE WE WE SN SN SN SN

Mean Northward Velocity year 3 WE WE WE WE SN SN SN SN

Impact on the Circulation

Impact on Transports 29ºN 25.7ºN 78.6ºW 80.9ºW Yucatan Haiti

Transport at 25.7ºN The total mean transport is roughly the same between CONTROL and TURB_C T =0.1/TURB_C T =0.1_W ALL1 Compensation between the surface and the deeper transport TURB_C T =0.1_WALL12 transport is half the CONTROL one

Upstream Transports The total mean transport is roughly the same between CONTROL and TURB_C T =0.1/TURB_C T =0.1_W ALL1 TURB_C T =0.1_WALL12 transport is MORE than a half the CONTROL one

Detoured Transports A transport of ~3 Sv detoured at 78W and ~12Sv between Haiti and Cuba.

Downstream Transport The total mean transport is roughly the same between CONTROL and ALL turbines simulations

Impact on Power Availability Power Availability : TURB_C T =0.1_WALL12 TURB_C T =0.1_WALL1 TURB_C T =0.1 CONTROL

Power Extraction Estimate Power Estimate : Sum of the difference of Kinetic Energy Fluxes between the point before and after the turbines Grid Cells TURB_C T =0.1_WALL12 TURB_C T =0.1_WALL1 TURB_C T =0.1

Mean Kinetic Energy TURB_C T =0.1_WALL12 TURB_C T =0.1_WALL1 TURB_C T =0.1 CONTROL

Summary 3 cases with different distribution of “turbines” in the Florida Current: 2 “reasonable” cases with 4 “turbines” and 12 “turbines” Flow decelerated at the surface but compensated at depth Circulation and transports remain similar to observations Kinetic Energy over the basin is slightly decreased MW of power extracted for a power availability of ~20GW as in the observations 1 “extreme” case with turbines over the first 180m of the 25.7ºN section Flow strongly decelerated without compensation at depth Transports at half the observations at 25.7ºN and upstream Detour of the flow of about 3Sv at 78W and 12Sv between Cuba and Haiti No change of the transport at 29ºN Kinetic Energy over the basin is decreased 160MW of power extracted for a power availability of ~3.4GW Future Work: => Focus on the Gulf Stream region => Focus on the Gulf of Mexico