On Tracer Breakthrough Curve Dataset Size, Shape, and Statistical Distribution.

A tracer breakthrough curve (BTC) for each sampling station is the ultimate goal of every quantitative hydrologic tracing study, and dataset size can critically affect the BTC. Groundwater-tracing data obtained using automatic sampling or detection devices may result in very high-density data sets. Data-dense tracer BTCs obtained using devices and stored in dataloggers can result in visually cluttered overlapping data points.

Modeling solute reactivity in a phreatic solution conduit penetrating a karst aquifer.

A two-dimensional model for solute migration, transformation, and deposition in a phreatic solution conduit penetrating a karst aquifer is presented in which the solute is anthropogenic to the natural system. Transformation of a reacting solute in a solution conduit has generally been accepted as likely occurring but actual physical measurements and mathematical analyses of the suspected process have been generally minimally investigated, primarily because of the logistical difficulties and complexities associated with solute transport through solution conduits. The model demonstrates how a reacting solute might decay or be transformed to a product solute some of which then migrates via radial dispersion to the conduit wall where it may become adsorbed.