In-Well Degassing of Monitoring Wells Completed in Gas-Charged Aquifers.

ABSTRACT: Total dissolved gas pressure (P_TDG ) measurements are useful to measure accurate in situ dissolved gas concentrations in groundwater, but challenged by in-well degassing. Although in-well degassing has been widely observed, its cause(s) are not clear. We investigated the mechanism(s) by which gas-charged groundwater in a recently pumped well becomes degassed. Vertical P_TDG and dissolved gas concentration profiles were monitored in the standing water column (SWC) of a groundwater well screened in a gas-charged aquifer for 7 days before and 15 days after pumping. Prior to pumping, P_TDG values remained relatively constant and below calculated bubbling pressure (P_BUB ) at all depths. In contrast, significant increases in P_TDG were observed

SUBMITTER: Morais TA 

PROVIDER: S-EPMC10087888 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature