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
Puerto Galván
Objectives
P Analize the effects of artificially
generated fluid mud on the suspended
sediment distribution
P Define residence time of the fluid mud
P Determine the circulation pattern of the
suspended sediment fluxes at the area
METHODOLOGY
GEOMORPHOLOGY
P Bathymetric (double frecuency) and side-scan sonar
surveys
P Bottom sediments
SEDIMENT TRANSPORT
P 6 cruises within 1 month (27-11/27-12/00) - ADCP
P 5 cross-sections
P Data included: velocity and suspended sediment
concentration profiles every 2 s along the crosssection
Side Scan Sonar Tracks
Cruises
P Draga IV.- 27 November 2000
P Draga V.- 30 November 2000
P Draga VI.- 6 December 2000
P Draga VII.-12 December 2000
P Draga VIII.- 20 December 2000
P Draga IX.- 27 December 2000
Location Cross-sections and Calibration Station
5708000
440
260
2100
5707000
1500
1800
5706000
4559500
4560500
4561500
4562500
28 NOV 2000
Ruido
Fango
Fluido
Escarpas
PTO. GALVAN
Pérdida del
Fondo
Fango
Fluido
1300
1500
Fango
Fluido
1800
Surcos de
Dragado
2100
2300
Escarpa
28 DIC 2000
5707500
5707400
Fango Fluido
Escarpas
26.00
5707300
25.00
Pérdida del Fondo
PTO.GALVAN
24.00
23.00
Escarpas
5707200
22.00
21.00
Fango Fluido
20.00
19.00
18.00
17.00
5707100
16.00
1300
15.00
Ruido
5707000
Escarpa
14.00
Fango
Fluido
1500
5706900
2100
Surcos de
Dragado
2300
0 0 8 16 5 4
0 0 7 16 5 4
0 0 6 16 5 4
0 0 5 16 5 4
0 0 4 16 5 4
0 0 3 16 5 4
0 0 2 16 5 4
0 0 1 16 5 4
0 0 0 16 5 4
0 0 9 0 65 4
0 0 8 0 65 4
0 0 7 0 65 4
0 0 6 0 65 4
0 0 5 0 65 4
0 0 4 0 65 4
5706800
1800
N
S
N
pierna 1800-1- 27 NOV
-7
pierna 1800-9- 27 DIC
pierna 1800-9- 30 NOV
pierna 1800-8- 27 NOV
pierna 1800-6- 27 DIC
-9
S
-12
-11
-13
Dragado 30 Nov.
-14
0
-15
100
200
300
distancia (m)
0
100
200
300
distancia (m)
400
500
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
-12
-14
0
100
200
300
400
500
400
50
TIME VARIATION OF
SUSPENDED SEDIMENT
FLUXES
TIME VARIATION OF
SUSPENDED SEDIMENT
CONCENTRATION
FSS - Draga IV - 27-11-01
2000
1000
0
-1000
7:00
9:00
11:00
13:00
15:00
17:00
19:00
17:00
19:00
21:00
Time
1500
1800
2100
H (m)
5
2.5
0
7:00
9:00
11:00
13:00 15:00
Time
21:00
) -1
1000
0
FSS (Kg seg
-1000
-2000
9:00
11:00
13:00
15:00
17:00
19:00
21:00
Time
1500
1800
2100
Dredging
6
4
2
0
9:00
11:00
13:00
15:00
Time
17:00
19:00
21:00
23:00
23:00
Conclusions
Geomorphology
P Bottom changes only on the northern
portion of the Principal Channel
P Fluid mud found at both SSS surveys
Conclusions
Sediment Transport
P SS fluxes are concentrated at the center
and southern parts of the Canal
PCirculation is affected by wind
conditions
P Increase in up to 40% in SSC from natural
conditions
P There are other sources of SS, of the
same order than dredged material
P Dredged fluid mud were redistributed in a
very short time