TAG Proposal “Forest vegetation as an indicator of natural gas leaks” Don Davis (PI) Lynda Farrell, Consultant.

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TAG Proposal “Forest vegetation as an indicator of natural gas leaks” Don Davis (PI) Lynda Farrell, Consultant.
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Presentation transcript:

TAG Proposal “Forest vegetation as an indicator of natural gas leaks” Don Davis (PI) Lynda Farrell, Consultant

GAS WELL DRILLING: POTENTIAL ADVERSE FOREST EFFECTS Gas Wells 60% Forested

GAS WELL DRILLING: POTENTIAL ADVERSE FOREST EFFECTS 1 GAS WELL DRILLING: POTENTIAL ADVERSE FOREST EFFECTS 1. Pad Site Logging & Construction Removal and Sale of Trees

Logging Wounds on Residual Trees at Edge 1. Direct Effects 2. Secondary Effects

2. Excavating & Grading “Edge Effects” Surface Water Flow Changes

“Edge Effects” (Tree Mortality Along Edge) Mortality not necc from salt, etc. May continue for years

3. Leaks & Spills of Brine (+ Frac’n Chemicals?)

Leaks from Lined Pits Deer Attracted to Salt

Salt Damage

4. Precursors to Ozone Formation (i. e 4. Precursors to Ozone Formation (i.e., NOx Emissions from Compressor Stations) Tons/Yr Tons/Yr Source: PA DEP (2010)

Ozone-Sensitive Plants Black Cherry Chinese Tallowtree

Vegetation Associated with Pipelines Excavation Clearing

Seeding Grading Establishment of Grasses, clover, etc.

Common Perennial Plants on PA Pipeline Corridors Vetch Grass Trefoil Grass Clover

So, what happens if there is a leak in a natural gas pipeline? Gas migrates upward in an inverted cone Root Death • Soil atmosphere • Soil oxygen depleted • Methanobacter (+ Size of leak, Pressure, etc. etc.) **OLD** Pipelines

Underground Leak Aerial View Pattern Influenced By • Soil Texture • Soil Disturbance Within Trench • Soil Moisture • Depth of Freezing **OLD** Pipelines

Woody Shrubs Over Old Pipelines

SUMMARY: Early Detection of Leaks Using Dead, Dying, or Discolored Vegetation Above Leaking Natural Gas Pipeline

TAG Proposal “Forest vegetation as an indicator of natural gas leaks” • 1. Outreach Activities Presentations at meetings Prep of publications, brochures, etc. • 2. Aerial surveys above old pipelines to locate patterns of discolored or injured vegetation • Follow-up with ground-truth surveys

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