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S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T
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Blue-Green Algae Conditionsand Innovative Technologies
Blue-Green Algae Task Force MeetingInnovative Technologies in South Florida
June 23, 2021Seán Sculley, PE, Applied Sciences Bureau Chief
Rory Feeney, Land Resources Bureau Chief
S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T
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Lake Okeechobee Harmful Algal Bloom (HAB) Monitoring and Management Strategies
Monitoring
Data Assessment
Forecasting
Mitigation & Prevention
Presenter: Seán Sculley
S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T
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New sites
Existing sites
Basin sites
Elements Basin Level Upstream Level# of sites 47 211
Frequency Biweekly or Weekly Biweekly
Monitored Parameters
TP, OPO4, TN, NH4, NOx, pH, Temperature, Dissolved Oxygen, Conductivity
Presenter: Seán Sculley
Expanded Watershed Monitoring
S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T
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Parameter Wet SeasonMay-October
Twice monthly
Dry SeasonNovember-AprilOnce monthly
Water qualityComprehensive algal IDDominant algal taxa IDAlgal toxins
Expanded Lake Okeechobee Monitoring
6 near real-time water quality and chlorophyll a / blue-green algae (cyanobacteria) monitoring sites
Presenter: Seán Sculley
9 sites 23 sites
S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T
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Water Quality Nearshore and pelagic dissolved inorganic nitrogen decreased
after algal bloom observations Nearshore chlorophyll a is increasing
0.000.100.200.300.400.500.60
Mar
-18
Apr-
18M
ay-1
8Ju
n-18
Jul-1
8Au
g-18
Sep-
18O
ct-1
8N
ov-1
8De
c-18
Jan-
19Fe
b-19
Mar
-19
Apr-
19M
ay-1
9Ju
n-19
Jul-1
9Au
g-19
Sep-
19O
ct-1
9N
ov-1
9De
c-19
Jan-
20Fe
b-20
Mar
-20
Apr-
20M
ay-2
0Ju
n-20
Jul-2
0Au
g-20
Sep-
20O
ct-2
0N
ov-2
0De
c-20
Jan-
21Fe
b-21
Mar
-21
Apr-
21
mg/
L
Nearshore Pelagic
S-191, Okeechobee, post Hurricane Irma
May Year Chl-A TN DIN TP SRP Turbidity2017 22.7 1.19 0.042 0.086 0.020 13.62018 18.6 1.61 0.306 0.178 0.067 38.32019 20.2 1.26 0.181 0.113 0.042 17.92020 25.1 1.17 0.038 0.076 0.016 10.22021 40.7 1.45 0.060 0.134 0.029 23.22017 12.5 1.64 0.330 0.193 0.067 61.32018 6.8 1.77 0.557 0.238 0.100 86.62019 8.7 1.30 0.328 0.154 0.069 43.32020 19.1 1.42 0.262 0.160 0.066 36.42021 20.4 1.25 0.219 0.194 0.064 53.8
Nearshore
Pelagic
Presenter: Seán Sculley 11
S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T
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May Surveys - Differences in Phytoplankton BiomassSurvey 1 (May 4 – 5, 2021) Survey 2 (May 17 - 19, 2021) Chlorophyll a (µg/L)
(*Provisional Data)
Chlorophyll a Concentration (µg/L)
< 2020 - 40> 40
Presenter: Seán Sculley
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Dominant Phytoplankton Taxa in the WY21 Wet Season
Dolichospermum circinale Microcystis aeruginosa Cylindrospermopsis raciborskii
Planktolyngbya limnetica
33% of the monitoring sites had samples with communitiesdominated by Microcystis aeruginosa in WY2021 wet season
Presenter: Seán Sculley
S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T
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May Surveys - Differences in Toxin Concentration Survey 1 (May 4 – 5, 2021) Survey 2 (May 17 - 19, 2021)
Below Detection Level (BDL)< 88 - 20> 20
Microcystin Concentration (µg/L)
Microcystin (µg/L) (*Provisional Data)
Presenter: Seán Sculley
Near Real-Time Monitoring
• In-situ: (Surface and bottom) Chlorophyll a, phycocyanin, temperature, turbidity, dissolved oxygen, pH
LZ40
POLESOUT1
LZ40
Presenter: Seán Sculley
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Lake OkeechobeeCyanobacteria Bloom Potential
NOAA cyanobacteria product derived from Copernicus Sentinel-3 OLCI data from EUMETSAT
Presenter: Seán Sculley
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Using Science to Take Action, in Partnership with DEP
Pahokee Marina - April 29, 2021
Pahokee Marina - May 24, 2021
Presenter: Rory Feeney
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Controlling BGA Blooms Using Innovative Technologies
Hydrogen Peroxide Ultrasonic Transducers
Aerators/Circulation Pumps Vacuum Services Nano-Bubble Technology
Presenter: Rory Feeney
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Innovative Technologies – Pahokee Marina
Physical Removal Algicide – PAK27, Phycomycin 6” temporary pump 4 Ultrasonic units 5 water quality sondes Dissolved Oxygen
Chlorophyll a PhycocyaninTurbidity
Drone imageryPahokee Marina May 28, 2021
Presenter: Rory Feeney
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Innovative Technologies – L10/L12 Canal
Granular Algaecide –PAK27
Water quality monitoring Before/During/After
Microcystin 5/23 – 24 ppb 5/24 – 6.3 ppb 5/26 – 1.8 ppb
Presenter: Rory Feeney
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Innovative Technologies – Caloosahatchee River
Blue Green Water Technologies Lake Guard Oxy (granular algaecide) Consistent Water Quality Monitoring Treated and maintained over 20.8 miles 81 treatments to 42 different locations
Presenter: Rory Feeney
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Innovative Technologies – St. Lucie Canal (S-308)
Downstream of S-308 May 28, 2021
Ultrasonic Unit Deployed Water Quality Monitoring
Presenter: Rory Feeney
S O U T H F L O R I D A W A T E R M A N A G E M E N T D I S T R I C T
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Monitoring Algae Blooms Coverageand Intensity Using Drones
Presenter: Rory Feeney
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“All Hands on Deck for Water Quality”
