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Patterns of Short-Term Sedimentation in a Freshwater Created Marsh

School of Natural Resources, The Ohio State University, 2021 Coffey Road, Columbus, OH 43210

View larger version (90K): [in a new window]   Fig. 1. Location of horizon marker sites and bulk density–organic matter sampling plots in the experimental wetland basins. Locations of horizon marker plots are indicated with numbers. Bulk density and organic matter sampling plots are indicated by letters. Emergent vegetation cover based on 1997 aerial photos is represented by shaded areas. The spheres in the interior of the basins indicate approximate locations of deep areas. The dashed areas indicate approximate mudflat zones.

View larger version (50K): [in a new window]   Fig. 2. Horizon marker station showing (a) the four marker materials immediately after installation and prior to flooding and (b) layout of the artificial soil horizon markers at each station within the experimental wetland basins. The orientation of the markers within the grid remains the same at each site when viewed from the boardwalk 2.4 m away.

View larger version (15K): [in a new window]   Fig. 3. Comparison of average sedimentation rates (cm yr-1) between deep and shallow plots for Wetlands 1 and 2. Error bars indicate standard error. Differences in letters above the bars indicate significant differences between plots within each wetland.

View larger version (24K): [in a new window]   Fig. 4. Average sedimentation rates (cm yr-1) with increasing distance from the inflow for (a) deep and (b) shallow areas of Wetland 1, and (c) deep and (d) shallow areas of Wetland 2. Error bars indicate standard error.

View larger version (24K): [in a new window]   Fig. 5. Regression of total suspended solids (mg L-1) and turbidity (NTU) for samples (a) above 100 NTU (n = 23), and (b) below 100 NTU (n = 51).

View larger version (23K): [in a new window]   Fig. 6. Summary of sediment fluxes measured in this study. All values are estimated as occurring over one year and were similar for both wetlands. Note the high rates of sedimentation and hence by definition resuspension compared with rates of inflow and outflow of sediments.