Phenomenological Investigations of the Jefferson Proving Ground UXO Technology Demonstrations
Abstract
Environmental conditions and geophysical properties and their spatial and temporal variability for the JPG UXO test sites are examined. The four JPG phases are discussed, and geophysical anomaly signatures are calculated for Phases II and III baseline ordnance items. Rainfall and its resulting effect on soil water content are the dominant environmental parameters. The near-surface soil electrical conductivity varies significantly between wet site conditions and dry site conditions. Implications of wet-versus-dry site conditions for detection of buried ordnance are significant for ground penetrating radar (GPR) and somewhat less significant for the electromagnetic (EM) induction methods. The presence of a clay layer as shallow as 0.3 m and 1.5 to 5 m thick can cause significant difficulties for GPR detection of ordnance items buried within the layer for any site condition (wet or dry). Above the clay layer, the material is predominantly very fine-grained quartz, with only small amounts of clay minerals, which refutes prior claims that high-clay content soils limited the depth of investigation of GPR at the JPG sites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1999
- Accession Number
- ADA368187
Entities
People
- Dwain K. Butler
- Janet E. Simms
- José L. Llopis