tag proposal “forest vegetation as an indicator of natural gas leaks” don davis (pi) lynda...
TRANSCRIPT
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TAG Proposal“Forest vegetation as an indicator of
natural gas leaks”
Don Davis (PI)Lynda Farrell, Consultant
TAG Proposal“Forest vegetation as an indicator of
natural gas leaks”
Don Davis (PI)Lynda Farrell, Consultant
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GAS WELL DRILLING:POTENTIAL ADVERSE FOREST EFFECTS
GAS WELL DRILLING:POTENTIAL ADVERSE FOREST EFFECTS
Gas Wells
60% Forested
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GAS WELL DRILLING:POTENTIAL ADVERSE FOREST EFFECTS
1. Pad Site Logging & Construction
GAS WELL DRILLING:POTENTIAL ADVERSE FOREST EFFECTS
1. Pad Site Logging & Construction
Removal and Sale of Trees
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Logging Wounds on Residual Trees at EdgeLogging Wounds on Residual Trees at Edge
1. Direct Effects2. Secondary Effects
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2. Excavating & Grading
1. “Edge Effects” 2. Surface Water Flow Changes
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“Edge Effects” (Tree Mortality Along Edge)
1. Mortality not necc from salt, etc.2. May continue for years
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3. Leaks & Spills of Brine (+ Frac’n Chemicals?)
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Leaks from Lined Pits
Deer Attracted to Salt
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Salt DamageSalt Damage
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4. Precursors to Ozone Formation(i.e., NOx Emissions from
Compressor Stations)
4. Precursors to Ozone Formation(i.e., NOx Emissions from
Compressor Stations)
Tons/Yr
Source: PA DEP (2010)
Tons/Yr
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Ozone-Sensitive PlantsOzone-Sensitive Plants
Black Cherry
Chinese Tallowtree
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Vegetation Associated with PipelinesVegetation Associated with Pipelines
Clearing
Excavation
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GradingGrading Seeding
Establishment ofGrasses, clover, etc.
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Common Perennial Plants on PA Pipeline Corridors
Common Perennial Plants on PA Pipeline Corridors
Grass
Clover
Vetch
Trefoil
Grass
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So, what happens if there is a leak in a natural gas pipeline?
So, what happens if there is a leak in a natural gas pipeline?
Root Death • Soil atmosphere • Soil oxygen depleted • Methanobacter
(+ Size of leak, Pressure, etc. etc.)
Gas migratesupward in aninverted cone
**OLD** Pipelines
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Aerial View Pattern Influenced By • Soil Texture • Soil Disturbance
Within Trench • Soil Moisture • Depth of Freezing
Underground Leak
**OLD** Pipelines
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Woody Shrubs Over Old PipelinesWoody Shrubs Over Old Pipelines
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SUMMARY: Early Detection of LeaksUsing Dead, Dying, or Discolored Vegetation
Above Leaking Natural Gas Pipeline
SUMMARY: Early Detection of LeaksUsing Dead, Dying, or Discolored Vegetation
Above Leaking Natural Gas Pipeline
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TAG Proposal“Forest vegetation as an indicator of
natural gas leaks”
TAG Proposal“Forest vegetation as an indicator of
natural gas leaks”
• 1. Outreach ActivitiesPresentations at meetingsPrep of publications, brochures, etc.
• 2. Aerial surveys above old pipelines to locate patterns of discolored or injured vegetation • Follow-up with ground-truth surveys
• 1. Outreach ActivitiesPresentations at meetingsPrep of publications, brochures, etc.
• 2. Aerial surveys above old pipelines to locate patterns of discolored or injured vegetation • Follow-up with ground-truth surveys