Estimation of Interstitial Velocity Using a Direct Drive High-Resolution Passive Profiler.

The fate and transport of groundwater contaminants depends partially on groundwater velocity, which can vary appreciably in highly stratified aquifers. A high-resolution passive profiler (HRPP) was developed to evaluate groundwater velocity, contaminant concentrations, and microbial community structure at ∼20 cm vertical depth resolution in shallow heterogeneous aquifers. The objective of this study was to use mass transfer of bromide (Br ), a conservative tracer released from cells in the HRPP, to estimate interstitial velocity.