Carmona De Jesus, Marvic

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    Fate and transport of TCE aqueous and non-aqueous phases in a karstified limestone physical groundwater model under different flow rates
    (2019-12-06) Carmona De Jesus, Marvic; Padilla-Cestero, Ingrid Y.; College of Engineering; Zapata-López, Raúl E.; Macchiavelli, Raúl E.; Department of Civil Engineering; Ramírez-Martínez, Wilson R.
    This research assesses the fate and transport of non-aqueous and dissolved trichloroethene (TCE) in a karstified limestone physical model (KLPM). The KLPM integrates a limestone block (15 cm x 15 cm x 77 cm) and simulates a confined karst aquifer. Transport experiments involve injecting tracer solutions and TCE non-aqueous phase liquid (NAPL) in the KLPM and monitoring solute concentrations and NAPL presence spatially and temporally. Results of concentration distributions show spatial variation related to the limestone heterogeneity. Generally, TCE NAPLs move downward but, at high flow rates, they also move through zones of non-vertical preferential flow. TCE NAPL dissolves in the flowing water and is transported rapidly through conduit features. Transport in the porous rock matrix occurs through diffuse flow and rate-limited mass transfer mechanisms. These zones serve as long-term storage reservoirs that can slowly release TCE over long periods of time.