The Floridan Aquifer : The Principal Source Of Water Supply
2042 WordsApr 15, 20169 Pages
The Floridan Aquifer extends through several southeastern U.S. states and is one of the most productive kart landscape in the country. The Floridan aquifer system consists primarily of limestone rocks of high permeability, and is separated into two principal hydro-stratigraphic zones consisting of the Upper Floridan Aquifer (UFA) and the Lower Floridan Aquifer (LFA). The upper Floridan aquifer is the principal source of water supply in most of north and central Florida: “The Upper Floridan aquifer generally consists of the Ocala Limestone and the dolomite and dolomitic limestones of the upper one-third of the Avon Park Formation” (OReilly, et al. 2002). The LFA consists of “alternating beds of limestone and dolomite, and is characterized…show more content…
Karst System Sediment Transport System and Response
Mahler & Lynch studied the sediment transport response of springs to two storm events: one following a wet season and the other following a dry season. They describe the temporal changes in total suspended solids (TSS), mineralogy, and particle size distribution. Concentrations of suspended sediment peaked 14 to 16 hours after rainfall, and the bulk of the sediment (approximately 1 metric ton in response to each storm) discharged within 24hour after rainfall. TSS consisted of dolomite, calcite, quartz, and clay. Sediment in karst is detrimental to aquifer permeability, wells, pumps, and spring esthetics. Sediment can act as a vector for nutrients, contaminants, or bacterial transport.
Mahler & Lynch focused on “temporal changes in geochemical characteristics of particulates discharging from a major karst spring in response to precipitation, and relate them to sediment source and potential for contaminant transport” (Mahler et al. 1998). The karst aquifer investigated was the Barton Springs segment of the Edwards aquifer in central Texas. Hourly samples for sediment and water analyses were collected from an orifice of Main Springs following two high-intensity storm events and one drawdown (nonstorm) event. Suspended sediment samples were