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Reservoir Sedimentation and Environmental Degradation

Assessing Trends in Sediment-Associated Trace Elements in Grenada Lake, Mississippi

^a Dep. of Geography, Univ. at Buffalo, Buffalo, NY 14261-0055
^b National Sedimentation Lab., USDA-ARS, P.O. Box 1157, Oxford, MS 38655

View larger version (22K): [in this window] [in a new window]   Fig. 1. Location map of Grenada Lake, MS, showing the outline of conservation pool, the Skuna River and Yalobusha River arms of the lake, numbered locations of select sediment cores (Cores 12 and 46 were obtained in the same location), and its relative position within Mississippi (inset).

View larger version (23K): [in this window] [in a new window]   Fig. 2. Vertical variations in 137Cs emissions and particle size (sand, silt, and clay by mass) for sediment Cores 22, 48, and 50 (see Fig. 1 for locations). Also shown are the interpreted 1964 ± 2 and 1954 timelines.

View larger version (37K): [in this window] [in a new window]   Fig. 3. Vertical variations in trace element concentration (As, Cr, Cu, Hg, Pb, Zn, and Al) and sediment texture (sand, silt, clay; from left to right) with depth below the lake bottom for Cores 12, 16, 34, and 35. Also shown is the interpreted 1954 timeline. Note variable units. Refer to Fig. 1 for core locations.

View larger version (25K): [in this window] [in a new window]   Fig. 4. Variation in trace element concentration with clay content and Al concentration (both as mass fraction of total) for all post-1954 sediment samples. Spearman's correlation coefficients (r) are also indicated and in each case p < 0.001.

View larger version (29K): [in this window] [in a new window]   Fig. 5. Vertical variations in normalized trace element concentration (As, Cr, Cu, Hg, Pb, and Zn; all are [mg/kg]/[Al %] except for Hg, which is [µg/kg]/[Al %]; from left to right) with depth below the lake bottom for Cores 12, 16, 34, and 35. Also shown is the interpreted 1954 timeline. Note variable units. Refer to Fig. 1 for core locations.

View larger version (31K): [in this window] [in a new window]   Fig. 6. Vertical variations in normalized trace element concentration (As, Cr, Cu, Hg, Pb, and Zn; all are [mg/kg]/[clay %] except for Hg, which is [µg/kg]/[clay %]; from left to right) with depth below the lake bottom for Cores 12, 16, 34, and 35. Also shown is the interpreted 1954 timeline. Note variable units. Refer to Fig. 1 for core locations.