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SSFATE MODELING

SSFATE MODELING. COMPUTATIONAL HYDRAULICS AND TRANSPORT. TOPICS. MODEL SETUP / HEM3D SEDIMENT SOURCES SEDIMENT TESTING MODEL VALIDATION. SEDIMENT SOURCES. FIELD TESTS ACCORD / TASS TGU RESUSPENSION FACTOR. RESUSPENSION RATES. CUTTERHEAD DREDGE (1-5%) CLAMSHELL DREDGE (2-8%).

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SSFATE MODELING

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  1. SSFATE MODELING COMPUTATIONAL HYDRAULICS AND TRANSPORT

  2. TOPICS • MODEL SETUP / HEM3D • SEDIMENT SOURCES • SEDIMENT TESTING • MODEL VALIDATION

  3. SEDIMENT SOURCES • FIELD TESTS • ACCORD / TASS • TGU • RESUSPENSION FACTOR

  4. RESUSPENSION RATES • CUTTERHEAD DREDGE (1-5%) • CLAMSHELL DREDGE (2-8%)

  5. SEDIMENT TESTING • RECEIVED SEVERAL SAMPLES • GRAIN SIZE ANALYSIS • SETTLING TESTS

  6. MODEL VALIDATION • DATA COLLECTED BY VIMS IN 1978 IN ELIZABETH RIVER • 7 SEPTEMBER • 19 SEPTEMBER • 26 SEPTEMBER • 28 SEPTEMBER

  7. DREDGING DATA • CUTTERHEAD DREDGE • 200 FT SWING EVERY 5 MIN • CUT – 5 FT DEEP AND 6 FT FORWARD • 100% LESS THAN 74 MICRONS

  8. MODEL PARAMETERS • 50% CLAY, 35% FINE SILT, 15% COARSE SILT • VERTICAL DISTRIBUTION OVER LOWER 2.5 M • POINT SOURCE • LINE SOURCE MOVING 1728 FT IN 24 HOURS • 3% RESUSPENSION

  9. MODEL COMPARISON WITH POINT SOURCE • SLACK 50 FT S , CONC = 140 (OBS 76) • SLACK 200 FT S , CONC = 10 (OBS 5) • FLOOD 260 FT S , CONC = 5 (OBS 27) • EBB 220 FT N , CONC = 40 (OBS 38) • EBB 320 FT S , CONC =30 (OBS 63) • EBB 440 FT N , CONC = 25 (OBS 56) • EBB 870 FT N , CONC = 10 (OBS 27)

  10. MODEL COMPARISON WITH LINE SOURCE • SLACK 200 FT CONC = 20 (OBS 20) • SLACK 50 FT CONC = 100 (OBS 76) • FLOOD 260 FT CONC = 20 (OBS 27) • EBB 220 FT CONC = 40 (OBS 38) • EBB 320 FT CONC = 20 (OBS 63) • EBB 440 FT CONC = 10 (OBS 56) • EBB 870 FT CONC = 5 (OBS 27)

  11. ACTIVITIES • SEDIMENT TESTING • VALIDATION RUNS FOR OTHER PERIODS IN SEPTEMBER 1978 • MODEL DREDGING OF THE TRENCH • MODEL EFFLUENT DISCHARGE • MODEL PLACEMENT OF ROCK

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