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Chloride Mass Balance recharge estimation, points dataset, McBride and Nulla basalt provinces

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Created 13/01/2025

Updated 13/01/2025

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This dataset includes point estimates of groundwater recharge in mm/year. Recharge rates have been estimated at monitoring bore locations in the basaltic aquifers of the Nulla and McBride basalt provinces. Recharge estimates have been calculated using the “chloride mass balance” method. The chloride mass balance process assumes that the chloride ion is a conservative tracer in precipitation, evapotranspiration, recharge and runoff; and that all the chloride is from rainfall, instead of for example halite saturation or dissolution processes. So the volumetric water balance and the flux of chloride balance must both be true. Assuming that runoff and evapotranspiration are negligible (so approximated by zero), the equation is simplified: Water balance P=ET+R+Q Water balance multiplied by chloride concentrations (chloridefluxbalance) P∙Cl_ppt=ET∙Cl_ET+R∙Cl_gw+Q∙Cl_riv | ΔCl_reac≈0 Assumptions to simplify equation P∙Cl_ppt=R∙Cl_gw | Q≈0 & ET≈0 Rearranging for recharge rate (unknown) R=P∙(Cl_ppt)/(Cl_gw ) | Q≈0 & ET≈0 Where P = precipitation rate; ET = evapotranspiration rate; R = recharge rate; Q = runoff to streams; Clppt = concentration of Cl in precipitation; ClET = concentration of chloride in evapotranspiration; Clgw = concentration of Cl in groundwater; Clriv = concentration of chloride in river runoff; ΔClreac = change in chloride concentrations from reactions.

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Title Chloride Mass Balance recharge estimation, points dataset, McBride and Nulla basalt provinces
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/49175b38-cc09-47e1-a1a2-b281165bc12f
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 29/01/2020
Geospatial Coverage {"type": "Polygon", "coordinates": [[[143.5, -20.3], [145.3, -20.3], [145.3, -17.7], [143.5, -17.7], [143.5, -20.3]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Chloride Mass Balance recharge estimation, points dataset, McBride and Nulla basalt provinces". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/chloride-mass-balance-recharge-estimation-points-dataset-mcbride-and-nulla-basalt-provinces

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