π Case Study
Arizona Desert Solar PV Decommissioning & Aridland Soil Stabilization
Caliche layer disruption and aeolian dust generation post-racking removal
ποΈ Project Overview
240 MW ground-mount solar farm near Yuma, AZ
π― Challenge
Caliche layer disruption and aeolian dust generation post-racking removal
π§ Design Approach
Racking reuse as windbreak framework; bio-stabilized gravel mulch + creosote bush (Larrea tridentata) transplant corridors
π Key Calculations
Dust Emission Factor (DEF)
PMββ emission rate Γ wind velocityΒ²
Result: 0.82 g/mΒ²/hr
Below EPA threshold of 1.2 g/mΒ²/hr
Gravel Mulch Coverage Ratio
Applied gravel mass / surface area
Result: 12 kg/mΒ²
Optimal for crust formation without inhibiting germination
π Results
98% reduction in PMββ emissions; 89% racking component reused; 71% native shrub survival at 18 monthsπ‘ Lessons Learned
- β’Racking reuse cut logistics footprint by 42%
- β’Creosote bush rootstock must be sourced <50 km for genetic fidelity
- β’Gravel mulch requires calibrated gradation (Dβ β = 8 mm)
β Key Takeaways
- 1Racking reuse cut logistics footprint by 42%
- 2Creosote bush rootstock must be sourced <50 km for genetic fidelity
- 3Gravel mulch requires calibrated gradation (Dβ β = 8 mm)