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Abstract Details

(2020) Assessment of Groundwater Ages Using Radiocarbon and Chlorofluorocarbons in West Hawai'i Aquifer Systems

Okuhata B, El-Kadi A, Dulai H, Lee J, Thomas D & Popp BN

https://doi.org/10.46427/gold2020.1987

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13e: Room 4, View in program

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Kip Solomon on
Thank for your interesting presentation. I'm wondering if the process of matrix diffusion might be important in this system (where solutes that move via advection along fractures diffuse into the surround relatively immobile matrix). How might this effect the apparent ages?

Submitted by Rolf Kipfer on
Dear Brytne Many thanks for your clear and nice presentations on (ground) water residence time in western part of Big Island. At other Hawaiian island results of transient gases (e.g. noble gases) and of the stable isotopic composition of water were used to analyse ground water dynamics. However, these results are controversially discussed as gas concentrations were found to be significantly lower than atmospheric equilibrium concentrations and the estimated recharge altitudes were higher than the highest elevations of the respective islands. My questions: How did you estimate the recharge elevation and are estimates reflected in the ?D and ?18O values of the groundwater? Do you intend to widen our study by applying noble gas analysis which would allow assessing the interaction with volcanic fluids (e.g. He) and to constraint recharge conditions? Best regards - Rolf Kipfer (RoKi)

Submitted by Connor Newman on
Very interesting presentation. I was wondering if you looked at using the combination of your age tracers to evaluate what type of lumped parameter models (LPMs) are applicable? The piston-flow model is mentioned at the beginning of your presentation but I wonder if given the older ages there could be dispersion within the system? This type of analysis might assist with the groundwater flow model as well because it can inform how you would expect flow paths to come together or diverge at various points in the aquifer.

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