EPIKARST HYDROGEOCHEMICAL PROCESSES IN TELOGENETIC KARST SYSTEMS IN SOUTH-CENTRAL KENTUCKY

Telogenetic epikarst storage and carbon transport processes are often complex and dynamic. Among the processes involved in their development and evolution are a highly variable storage and flow relationship that is often influenced by the type, rate, and amount of dissolution kinetics involved. Additionally, rapid exchange of CO₂ and initial dissolution in the epikarst zone may drive hydrogeochemical change that influence carbonate dissolution processes and conduit formation. This study aims to identify epikarst behavior characteristics and mechanisms that influence storage and flow propensity and carbon flux within telogenetic epikarst systems in two system in south-central Kentucky. High-resolution hydrogeochemical and discharge data from multiple dataloggers and collected water samples over one calendar year (including storm events) serve to provide a more holistic picture of the processes at work within these epikarst aquifers, which are estimated to contribute significantly to carbonate rock dissolution processes and storage of recharging groundwater reservoirs on the scale of regional aquifer rates. Preliminary data indicate rapid responses to storm events, including variable storage and meteoric water fluctuations, which drive the carbon storage and removal rates. Additionally, epikarst storage volumes may meet or exceed those of major springs in regional telogenetic aquifer systems that are primarily conduit-dominated.