1. Sediment Erosion Characteristics at the Potomac River Jerome P.-Y. maa Virginia Institute of Marine Science College of William and Mary

2. Douglas Pt Maryland Pt Gunston Cove Three experimental sites in 2005

3. Maryland Pt.

4. Douglas Pt

5. Two experimental sites at Gunston Cove in 2004, only select one in 2005

6. A sediment sample from Gunston Cove site on Virginia side

7. 10 -2 10 10 0 APPRXIMATED EXCESS BED SHEAR STRESS (Pa) 00.10.20.30.40.50.60.70.80.91 10 -3 10 -2 10 BED SHEAR STRESS (Pa) 10 -6 10 -4 10 -3 10 -2 10 (s -1 ) EROSION RATE (g/cm 2 /s) 10 -5 10 -7 10 -3 Gunston Cove (Aug., 04) Virginia Side Maryland Side

8. VIMS sea Carousel

9. 00.511.522.533.54 0 1000 2000 3000 4000 5000 OBS Output (v) TSS Conc. (mg/L) C = -16.3031 + 324.121 v + 490.70* v 2 - 27.74* v 3 Fig. XX. Calibration curve for converting the OBS readings to suspended sediment concentrations. Plus signs are from Douglas Point site, diamonds are from Maryland Point site and circles are from Gunston Cove site.

10. 0 0.02 0.04 0.06 0.08 0.1 Shear Stress (Pa) 0102030 40 0 100 200 300 400 Time (min) TSS (mg/L) Maryland Point Incipient test Sept. 13, 2005  cr = 0.05 Pa

11. 0 0.02 0.04 0.06 0.08 0.1 Shear Stress (Pa) 010203040 50 0 200 400 600 Time (min) TSS (mg/L) Douglas Point Incipient test Sept. 12, 2005  cr = 0.045 Pa

12. 0 0.05 0.1 0.15 Shear Stress (Pa) 020406080 0 50 100 150 200 Time (min) TSS (mg/L) Gunston Cove Incipient test Sept. 14, 2005  cr = 0.13 Pa

13. 0 0.4 0.8 050100150200 0 1 2 3 Time (min) Shear Stress (Pa) TSS (g/L) Douglas Point Erosion rate test 0.1 0.15 0.21 0.3 0.41 0.55 0.72 0.98

14. 0 0.4 0.8 1.2 Shear Stress (Pa) 04080120160200 0 1 2 3 4 5 Time (min) TSS (g/L) Maryland Point Erosion rate test 0.1 0.16 0.24 0.37 0.55 0.79

15. 0 0.4 0.8 050100150200 0 1 2 3 4 5 Time (min) TSS (g/L) Shear Stress (Pa) Gunston Cove Erosion rate test 1. 2 1.10 0.79 0.55 0.37 0.243 0.156

16. 10 -2 10 10 0 -6 10 -4 APPRXIMATED EXCESS BED SHEAR STRESS (Pa) 00.20.40.60.81 10 -3 10 -2 10 BED SHEAR STRESS (Pa) (s -1 ) EROSION RATE (g/cm 2 /s) Gunston Cove (Sept. 05) Douglas Pt and Maryland Pt 10 -5 10 -7 10 -3 Gunston Cove (Aug., 04)

17. 10 -2 10 10 0 APPRXIMATED EXCESS BED SHEAR STRESS (Pa) 00.10.20.30.40.50.60.70.80.91 10 -3 10 -2 10 BED SHEAR STRESS (Pa) 10 -6 10 -4 10 -3 10 -2 10 (s -1 ) EROSION RATE (g/cm 2 /s) 10 -5 10 -7 10 -3 Gunston Cove (Aug., 04) Virginia Side Maryland Side

18. Thanks