Effects of Dredged Fluid Mud on the Suspended Sediment Transport in PuertoGalván, Argentina Gerardo M. E. Perillo Instituto Argentino de Oceanografía,

Presentación del tema: "Effects of Dredged Fluid Mud on the Suspended Sediment Transport in PuertoGalván, Argentina Gerardo M. E. Perillo Instituto Argentino de Oceanografía,"— Transcripción de la presentación:

1 Effects of Dredged Fluid Mud on the Suspended Sediment Transport in PuertoGalván, Argentina Gerardo M. E. Perillo Instituto Argentino de Oceanografía, CC 804, 8000 Bahía Blanca, Argentina Departamento de Geología, Universidad Nacional del Sur, San Juan 670, 8000 Bahía Blanca, Argentina

2 Puerto Galván

3 Objectives PAnalize the effects of artificially generated fluid mud on the suspended sediment distribution PDefine residence time of the fluid mud PDetermine the circulation pattern of the suspended sediment fluxes at the area

4 METHODOLOGY GEOMORPHOLOGY PBathymetric (double frecuency) and side-scan sonar surveys PBottom sediments SEDIMENT TRANSPORT P6 cruises within 1 month (27-11/27-12/00) - ADCP P5 cross-sections PData included: velocity and suspended sediment concentration profiles every 2 s along the cross- section

5 Side Scan Sonar Tracks

6 Cruises PDraga IV.- 27 November 2000 PDraga V.- 30 November 2000 PDraga VI.- 6 December 2000 PDraga VII.-12 December 2000 PDraga VIII.- 20 December 2000 PDraga IX.- 27 December 2000

7 Location Cross-sections and Calibration Station 4559500456050045615004562500 5706000 5707000 5708000 1500 1800 2100 260 440

8 1300 1500 1800 2100 2300 PTO. GALVAN Escarpas Pérdida del Fondo Fango Fluido Escarpas Surcos de Dragado Fango Fluido Ruido Fango Fluido 28 NOV 2000

9 1300 1500 1800 2100 2300 PTO.GALVAN Pérdida del Fondo Escarpas Fango Fluido Surcos de Dragado Fango Fluido Escarpas Ruido Escarpa Fango Fluido 28 DIC 2000 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 4 5 6 0 4 0 0 4 5 6 0 5 0 0 4 5 6 0 6 0 0 4 5 6 0 7 0 0 4 5 6 0 8 0 0 4 5 6 0 9 0 0 4 5 6 1 0 0 0 4 5 6 1 1 0 0 4 5 6 1 2 0 0 4 5 6 1 3 0 0 4 5 6 1 4 0 0 4 5 6 1 5 0 0 4 5 6 1 6 0 0 4 5 6 1 7 0 0 4 5 6 1 8 0 0 5706800 5706900 5707000 5707100 5707200 5707300 5707400 5707500

10 N S 0100200300400500 distancia (m) -15 -13 -11 -9 -7 p r o f u n d i d a d ( m ) pierna 1800-1- 27 NOV pierna 1800-6- 27 DIC Dragado 30 Nov. N S 0100200300400500 distancia (m) -14 -12 p r o f u n d i d a d ( m ) pierna 1800-9- 27 DIC pierna 1800-3- 20 DIC pierna 1800-1- 12 DIC pierna 1800-2- 06 DIC pierna 1800-9- 30 NOV pierna 1800-8- 27 NOV N S 0100200300400500 distancia (m) -14 -12 p r o f u n d i d a d ( m ) pierna 1800-9- 27 DIC pierna 1800-9- 30 NOV pierna 1800-8- 27 NOV

11 TIME VARIATION OF SUSPENDED SEDIMENT FLUXES

12 TIME VARIATION OF SUSPENDED SEDIMENT CONCENTRATION

13 -1000 0 1000 2000 7:009:0011:0013:0015:0017:0019:0021:00 Time 150018002100 0 2.5 5 7:009:0011:0013:0015:0017:0019:0021:00 Time H (m) FSS - Draga IV - 27-11-01

14 -2000 -1000 0 1000 9:0011:0013:0015:0017:0019:0021:0023:00 Time FSS (Kg seg ) 150018002100 Dredging 0 2 4 6 9:0011:0013:0015:0017:0019:0021:0023:00 Time

15 Conclusions Geomorphology PBottom changes only on the northern portion of the Principal Channel PFluid mud found at both SSS surveys

16 Conclusions Sediment Transport PSS fluxes are concentrated at the center and southern parts of the Canal PCirculation is affected by wind conditions PIncrease in up to 40% in SSC from natural conditions PThere are other sources of SS, of the same order than dredged material PDredged fluid mud were redistributed in a very short time