The annual cycle of plutonium in the water column of a warm, monomictic reservoir

Contrasting cesium dynamics in neighboring deep and shallow warm-water reservoirs

“…By June, both reservoirs have anoxic hypolimnions beginning at depths of 6 m. As these anoxic waters develop, 137 Cs and Fe concentrations increase. For Pond B,137 Cs concentrations in both the surface waters and the hypolimnion increase by a factor of 2Â (Alberts et al, , 1987, and the Fe inventories in the hypolimnion increase by a factor of >15Â (Pinder et al, 1992). The increases in the surface waters reflect mixing across the thermocline, and has been estimated to involve approximately 0.2% of the hypolimnion per day (Hinton and Pinder, 2001).…”

“…For Par Pond and Pond B, the effect of this remobilization resulted in 1.5Âe3Â increases in Cs concentrations in the water column. These increases begin as temperature gradients between surface and deep waters increase to >15 C, and anoxia (defined as O 2 concentrations <1 mg L À1 ) develops in the hypolimnion during April and May (Chimney et al, 1985;Alberts et al, 1987;Pinder et al, 1992). By June, both reservoirs have anoxic hypolimnions beginning at depths of 6 m. As these anoxic waters develop, 137 Cs and Fe concentrations increase.…”

Environmental Assessment and Finding of No Significant Impact: Pond B Dam Repair Project at the Savannah River Site

“…Because of the operational history of the impoundment, a number of both radioecological and general ecological research projects have been conducted within this former cooling water basin (e.g., Bowling et al 1994, Kelly and Pinder 1996, Pinder et al 1992, Rea et al 1998, Whicker 1988, Whicker et al 1990). Ongoing research projects in the field of radioecology are being conducted by the Savannah River Ecology Laboratory (SREL).…”

SRS Ecology Environmental Information Document -1997 Update

“…Environmental Information Document-SRS Ecology Chapter SStreams, Reservoirs, and the Savannah River Two studies have analyzedthe cycling of plutonium inventories in the Pond B water column (Pinder et al 1992;Bowling et al 1994). Plutonium-239/240 inventories in the water column of Pond B represent 10" of the sediment plutonium inventory.…”

“…Increases observed in the dissolved fraction may not represent dissolved plutonium. The majority of plutonium was not in a dissolved form, but was associated with very small particles (Pinder et al 1992).…”