Progress Report on UC Davis Research at Clear Lake ( The Lake Health - - PowerPoint PPT Presentation

▶
progress report on uc davis research at clear lake
SMART_READER_LITE
LIVE PREVIEW

Progress Report on UC Davis Research at Clear Lake ( The Lake Health - - PowerPoint PPT Presentation

Jul 06, 2023 134 likes •455 views

Progress Report on UC Davis Research at Clear Lake ( The Lake Health and Water Quality Part) Geoff Schladow Alex Forrest Steve Sadro plus a host of researchers, students and technicians Clear Lake Blue Ribbon Committee June 5, 2019 Clear

slide-1
SLIDE 1

Progress Report on UC Davis Research at Clear Lake (The Lake Health and Water Quality Part)

Geoff Schladow Alex Forrest Steve Sadro plus a host of researchers, students and technicians

Clear Lake Blue Ribbon Committee June 5, 2019

slide-2
SLIDE 2

Cyanobacteria bloom in Clear Lake (2016) Photo courtesy of Holly Harris

Clear Lake is the most complex lake in California

UC Davis has been asked to conduct the science upon which to base a recovery plan

slide-3
SLIDE 3

EXTERNAL LOADS INTERNAL LOADS INTERNAL PROCESSES

  • 1. All three need to be known
  • 2. Hypothesis: internal lake processes => internal loads > external

loads

  • 3. Measurement program + stakeholder data
  • 4. lake modeling => explore viable solutions
  • 5. Lake modeling => quantify the impacts of watershed actions,

climate change, ….

WELCOME TO CLEAR LAKE!

slide-4
SLIDE 4

Fundam Fundamen ental al Q Ques uestion n - Wh What drives eut eutrophi phication n and and bl blue ue-gr green b blooms?

External loading

  • f nutrients

Internal loading

  • f nutrients

Intense, but changing temperature stratification

slide-5
SLIDE 5
slide-6
SLIDE 6

Lake Monitoring Network

  • Stream monitoring sites
  • Lake moorings
  • Sediment traps
  • Meteorological sites
slide-7
SLIDE 7

Stream Monitoring

  • In-situ optical turbidity sensors

in primary tributaries to lake

  • Used to estimate sediment

and nutrient loading

slide-8
SLIDE 8
slide-9
SLIDE 9
slide-10
SLIDE 10

Lake Moorings

slide-11
SLIDE 11
slide-12
SLIDE 12
slide-13
SLIDE 13

Orthophosphate in Clear Lake vs. Lake Tahoe (April 2019)

Micrograms-P per liter of lake water

UA-08 UA-07 UA-06 UA-01 NR-02 OA-04 LA-03 L. TAHOE

20 15 10 5

Nitrate + Nitrite in Clear Lake vs. Lake Tahoe (April 2019)

UA-08 UA-07 UA-06 UA-01 NR-02 OA-04 LA-03 L. TAHOE

20 15 10 5 Micrograms-N per liter of lake water

IN SUMMER WE EXPECT THAT BOTTOM P WILL INCREASE DRAMATICALLY

slide-14
SLIDE 14

Fine, Medium and Coarse Suspended Particles in Clear Lake

  • vs. Lake Tahoe (April 2019)

Fine = 0.5 – 2.8 microns Medium = 2.8 – 8.0 microns Coarse = 8.0 – 16 microns Millions of particles per milliliter of lake water 10 8 6 4 2

UA-08 UA-07 UA-06 UA-01 NR-02 OA-04 LA-03 L. TAHOE

slide-15
SLIDE 15

Sediment Traps

slide-16
SLIDE 16

New studies of lake sediments

Sediment Traps Sediment Incubations

  • Quantify sedimentation rates
  • Analyze particle size distributions
  • Characterize carbon, nitrogen, and

phosphorus content of sediments

  • Quantify P-release rates under

different oxidative conditions

  • Characterize spatial and temporal

variability in P-release

  • Model internal P-loading from

sediments

slide-17
SLIDE 17

Assessment of P-sampling methods

Characterize vertical distribution of different P-fractions in sediments and advise Lake County regarding current sampling approach

(other fractions not shown: loosely bound, Ca-bound, Fe-Al-bound, and residual)

slide-18
SLIDE 18

Meteorological Sites

slide-19
SLIDE 19

Variability in Wind Forcing

12% 24% 36% 0% E W N S 12% 24% 36% 0% E W N S 12% 24% 36% 0% E W N S 12% 24% 36% 0% E W N S 12% 24% 36% 0% E W N S 12% 24% 36% 0% E W N S

Wind Speeds in mph WS 20 15 WS < 20 10 WS < 15 5 WS < 10 WS < 5

12% 24% 36% 0% E W N S
slide-20
SLIDE 20

3-D Hydrodynamic + WQ model

slide-21
SLIDE 21

3-D Hydrodynamic + WQ model

High resolution to understand Internal Loading High resolution to understand Algal Blooms

slide-22
SLIDE 22

Advanced Instrumentation – to be deployed as the key questions get better defined

slide-23
SLIDE 23

GAVIA AUV

slide-24
SLIDE 24

SLOCUM GLIDER

slide-25
SLIDE 25

SATELLITES, HELICOPTERS, DRONES

slide-26
SLIDE 26

EDGETECH COMBINED BATHYMETRY and SIDE SCAN SONAR BIOSONICS SCIENTIFIC ECHOSOUNDER

slide-27
SLIDE 27

CURRENT TRACKING IN THE OAKS ARM, 1997

slide-28
SLIDE 28

66,279 points = 413 points/km2 879,384 points = 121,513 points/km2

BATHYMETRY – A MAJOR DEFICIENCY

slide-29
SLIDE 29

GREATLY APPRECIATE THE DATA SHARING AND SPIRIT OF COLLABORATION WITH THE COUNTY, DWR, THE TRIBES, USGS, PAST CLEAR LAKE RESEARCHERS, PRIVATE CITIZENS…

slide-30
SLIDE 30

THANK YOU