Suspended sediment concentration

Early measurements of the ambient suspended sediment concentrations in the upper reaches of the estuary report an average concentration of 17 mg L-1 (at kilometer 190; Dole and Stabler, 1909) and33 mgL-1 (at kilometer 120; Panuzio, 1965). A

a AXIAL DISTANCEÍkm)

b AXIAL DISTANCE (km)

Figure 4.1. Average salinity (a) and average, suspended sediment concentrations (b) along the axis of the Hudson (from nine sections between November, 1980 and September, 1981; Hirschberg and Bokuniewicz, 1991).

b AXIAL DISTANCE (km)

Figure 4.1. Average salinity (a) and average, suspended sediment concentrations (b) along the axis of the Hudson (from nine sections between November, 1980 and September, 1981; Hirschberg and Bokuniewicz, 1991).

value of 33 mg L-1 was also obtained from measurements at kilometer 30 over a tidal cycle (Olsen, 1979). Seasonal sampling along the axis of the estuary yielded an average concentration of 35 mg L-1 with mean values of 25 mg L-1 at the surface and 46mgL-1 near the estuary floor (Arnold, 1982). Suspended particles appear in two dominant modes; those less than 4.65 ¡m in diameter and those greater than 22.1 ¡m (Menon, Gibbs, and Phillips, 1998).

Tidal cycle variations may range over a factor of 3 or 4 (at kilometer 30; Olsen, 1979) and seasonal variation from17to45 mg L-1 in the upper reaches and 23 to 26 mg L-1 in the lower reaches (Arnold, 1982). In the upper reaches, the variation of suspended sediment load is expected to be due to changes in the delivery of sediment past Troy over the seasons, while in the lower reaches the variations seem to be controlled more by tidal resuspension (Arnold, 1982).

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