An Instrument for the Determination of a Hydropneumograph in a Bubbling Spring

Area of Science:

• Earth Science
• Hydrology
• Geochemistry

Background:

• Groundwater springs often exhibit mixed-phase flow (gas and water).
• Accurate measurement of gas and water mass discharge is crucial for hydrological and geochemical interpretations.
• Existing methods may not adequately capture both gas and water flow rates in bubbling springs.

Purpose of the Study:

• To develop and field-test a deployable instrument for independent measurement of gas and water mass flow rates in mixed-phase spring discharge.
• To enable accurate determination of gas and water-gas ratios (WGR) in spring systems.
• To facilitate compositional analysis of collected free gas for improved geochemical parameter estimation.

Main Methods:

• Development of a field-deployable instrument using commercially available components.
• Integration of a phase separator at the spring discharge point.
• Utilization of a thermal mass flow sensor for gas flow rate measurement (ebullition + flux).
• Determination of water flow rate using a standard weir.

Main Results:

• Successful field deployment and testing of the developed instrument.
• Independent measurement of gas and water mass flow rates was achieved.
• The instrument is suitable for springs with bubbling mixed-phase flow.

Conclusions:

• The developed instrument provides accurate, independent measurements of gas and water mass flow rates in mixed-phase spring discharge.
• This technology enhances the ability to analyze groundwater systems and subsurface gas dynamics.
• The collected gas samples can be used for detailed compositional analysis, improving estimates of groundwater recharge and gas flux.