Residual Hotspot Photos and Hyperspectral Measurements: Water Well and Plant Area Hotspots

Erin Male, William Pickles

UC Santa Cruz

September 21, 2009

E.Male, UCSC, Sept. 2009

Locations of Hyperspectral Measurements

20082008 20092009

N

Met

ers

E.Male, UCSC, Sept. 2009

Water Wells Hot Spot: 2008 vs. 2009

2008:2008: Before injection (facing SE), Mixture of all varieties of grasses

and dandelions

2009:2009: Before injection (facing W), Mostly short grass (like Kentucky Blue)

and dandelions, No tall grass

Unmown RegionUnmown Region

E.Male, UCSC, Sept. 2009

8/3/2008, Day 25 (facing SE)

7/11/2008, Day 3 (facing E): Yellowing indicated initial

stages of plant stress

Water Wells Hot Spot: 20082008

E.Male, UCSC, Sept. 2009

Water Wells Hot Spot: 20082008

Close up: 8/3/2008, 25 days of CO2 (facing SE)

Thin-bladed, short grass, resistant to CO2 Stress (Kentucky Bluegrass?)

New Shoots (Orchard Grass?)

Various Tall Grasses

E.Male, UCSC, Sept. 2009

Water Wells Hot Spot: 20092009SW End of WellSW End of Well

After 1 week of CO2After 1 week of CO2* Asymmetric pattern of stress (Groundwater Flow?)

Injectio

n W

ellIn

jection

Well

E.Male, UCSC, Sept. 2009

Water Wells Hot Spot: 20092009

8/12/2009: 28 days of CO2 (facing SW)

Injectio

n W

ellIn

jection

Well

SW End of WellSW End of Well

E.Male, UCSC, Sept. 2009

Plant Area Hot Spot (-1.5, 0)

2008:2008: Before injection, 7/7/2008 (-1.55, 0)

Mixture of all varieties of grasses

2009:2009: Before injection, 7/10/2009 (-1.35, 0)

More dandelions, less tall grass

E.Male, UCSC, Sept. 2009

Can the change in vegetation species be seen spectrally?

• No significant differences in visible region between 2008 and 2009 experiments

• Subtle differences in Near-Infrared region, particularly in the slope of spectra from 750 to 950nm– Reflectance spectra of vegetation in the NIR (700

to 1300nm) is related to leaf structure

• More research to investigate this idea to follow

E.Male, UCSC, Sept. 2009

E.Male, UCSC, Sept. 2009

E.Male, UCSC, Sept. 2009

Having different mix of vegetation in the Hotspots may also explain the initial offset in NDVI values (also seen using Multispectral Camera) before the start of the 2009 injection

Averaged NDVI

20082008 20092009