US Army Corps of Engineers ® Engineer Research and Development Center West Bay Sediment Diversion...

US Army Corps of Engineers® Engineer Research and Development Center

West Bay Sediment Diversion Work PlanTask 1 : Data Collection and Analysis

December 1 2009

Thad Pratt CEERD-HF-FM


Data Collection Trips• Data collection Trip 1, March 9-12, 22-23 April, 5-6 May, 2009: Multi-beam and hydrodynamic (ADCP) surveys, bed samples and

suspended sediment samples.

• Data collection Trip 2, 27-31 May, 2009: Hydrodynamic surveys, suspended sediment samples and additional bed material samples from below Cubit’s Gap to Southwest Pass Jetties.

• Data collection Trip 3, June 15-18, 2009: Hydrodynamic surveys and suspended sediment samples.

• Data collection Trip 4, July 21-23, 2009: Hydrodynamic surveys, suspended sediment samples, and bed load samples.

• Additional Multi-beam survey, August 2009

• Data Collection Trip 5, September 23-24, 2009: Hydrodynamic surveys, suspended sediment samples and bed material samples.


Mississippi River Stage & Survey Dates


Instrumentation

• Geo-Acoustics 250 kHz swath system

w/ Applanix POSMV IMU• RDI 600 kHz Broadband ADCP with bottom-

tracking and GPS • P-61 point sampler for suspended sediments• Push core & bottom surface drag samplers• OBS and CTD Profiler


Multi-beam Survey Coverage


Multi-beam Surveys of the West Bay Diversion Cut

April Survey

August Survey


Transect Lines

Area 1 – April 22-23, 2009

Area 2 – April 22-23, 2009

Area 3 – April 22-23, 2009

Area 4 – April 22-23, 2009


Survey Dates Apr 22-23 May 5-6 May 29-30 Jun 16-17 Jul 21

Discharge North of Channel

550,738 ft3/s 500,448 ft3/s 740,062 ft3/s 568,041 ft3/s 304000 ft3/s

Discharge into Channel

46,514 ft3/s 42,011 ft3/s 68,373 ft3/s 52,252 ft3/s 31,000 ft3/s

Discharge South of the Channel

509,966 ft3/s 454,715 ft3/s 675,834 ft3/s 485,332 ft3/s 260,000 ft3/s

Percentage discharge into the channel

8.4% 8.4% 9.2% 9.2% 10.1%

Percentage of unaccounted discharge

1% -1% 1% -5% 4.2%

Discharges through the control volume that includes the West Bay Diversion Channel


Discharges through the control volume that includes Cubit’s Gap

Survey Dates April 22-23 May 29-30 June 16-17 Jul 21

Discharge north of Cubit’s Gap

509,966 ft3/s 675,834 ft3/s 485,332 ft3/s 237,000 ft3/s

Discharge through Cubit’s Gap

80,945 ft3/s 126,132 ft3/s 87,884 ft3/s 42,000 ft3/s

Discharge south of Cubit’s Gap

443,033 ft3/s 560,997 ft3/s 378,873 ft3/s 187,000 ft3/s

Percentage discharge into the channel 15.9% 18.7% 18.1% 18.1%

Percentage of unaccounted discharge 3% 2% -4% 3.3%


3D Velocity Mapping Coinciding with Suspended Sediment Samples

166,167,176,177

185,186,193,194

May 5-6, 2009


3D Velocity Mapping in Vicinity of West Bay Diversion

Area 2 – April 22-23, 2009


3D Velocity Mapping Inside West Bay Diversion

87

Area 3 – April 22-23, 2009


3D Velocity Mapping in Vicinity of Cubit’s Gap

119,121,123

124,125,126,127

137

132,135,136

133,134

128,130,131

139,140,141

142,143,144

145,146,147,148

149,150,151,152

156

157

158

159

160

161

162

163

153,154,155

Area 4 – April 22-23, 2009


West Bay Diversion Depth Averaged Velocities April 2009


West Bay Diversion Surface Velocity April 2009


West Bay Diversion Bottom Velocity April 2009


Vertical Velocity Distribution within West Bay Diversion


Locations of suspended sediment samples, OBS measurements, and salinity

measurements made on May 30, 2009.

R5.2-A

R5.2-B

R5.2-C

R5.2-D

R5.2-E

R4.5-A

R4.5-B

R4.5-C

R4.5-D

R4.5-E

R4.9

WBD-A,B,C

CGMP

CGO5

CGBB

CGRP


River Transect North of West Bay June 2009

00.0

10.0

20.0

30.0

40.0

50.0

60.0

0.00 100.00 200.00 300.00 400.00 500.00 600.00 700.00

SSC (mg/L)

Dep

th (

ft)

N-1

N-2

N-3

N-4

N-5

River Transect just North of Diversion (June 17th)

R5.2-E 30ft

0

0.5

1

1.5

2

2.5

3

3.5

4

0.1 1 10 100 1000

Particle Diameter (um)

% o

f V

olu

me Series1

Series2

Series3

Series4


May 29th Survey Range 5.2

R5.2-E 30ft

0

0.5

1

1.5

2

2.5

3

3.5

0.1 1 10 100 1000


% o

f V

olu

me Series1

Series2

Series3

Series4

R5.2-D 50ft

0

0.5

1

1.5

2

2.5

3

0.1 1 10 100 1000


% o

f V

olu

me Series1

Series2

Series3

Series4

R5.2-B 48ft

0

0.5

1

1.5

2

2.5

3

3.5

0.1 1 10 100 1000


% o

f Vol

ume

Series1

Series2

Series3

Series4

Series5

Series6

R5.2-A 30ft

0

0.5

1

1.5

2

2.5

0.1 1 10 100 1000


% o

f Vol

ume

Series1

Series2

Series3

Series4

Series5

Series6

R5.2-C 48ft

0

0.5

1

1.5

2

2.5

3

0.1 1 10 100 1000


% o

f Vol

ume

Series1

Series2

Series3

Series4


Suspended Sediment ConcentrationsWest Bay Cut Transect SSC April 2009

0

5

10

15

20

25

30

35

40

45

100 150 200 250 300 350

SSC (mf/L)

Dep

th (

ft) WB Cut 1

WB Cut 2

WB Cut 3

Transect North of West Bay Cut SSC April 2009

0

5

10

15

20

25

30

35

40

45

50

0 50 100 150 200 250 300 350 400 450 500

SSC (mg/L)

Dep

th (

ft) N Riv 1

N Riv 2

N Riv 3


Size Classification for TSM Samples/ Depth

WBDMR-A

Depth (ft) % Sand %Silt %Clay

% very fine silt

% fine silt

%med silt

%coarse silt

%very fine sand

% fine sand

%med sand

%coarse sand

1 2.289825 71.905 25.79425 18.75 22.335 18.28 12.54 2.2885 0.001325 0 0

7.5 13.13675 65.0125 21.85775 16.16 19.38 16.25 13.2225 9.756 3.294 0.08675 0

15 16.54952 62.685 20.76175 15.635 18.7675 15.4475 12.835 11.3425 5.07725 0.129771 0

22.5 29.57163 52.101 18.32263 13.0825 15.455 12.88375 10.67975 10.446 5.605 2.7235 10.79713

30 14.89658 63.7725 21.31225 15.83 19.095 15.43 13.4175 12.855 2.041575 0 0


Drag and Push Core Sediment Samples taken on March 10-12 in vicinity of WB

and Cubit’s Gap

56

55

50 49

15

16

17 18

37,38

996

998

99948

997

3947

53

54

19

20

52

5144

45

46

43

42

41

40

34

35

36

32 33

57

21

22

24

23

26

25

28

27

30

29

31

58

Diversion Channel


Drag and Push-core Samples taken on March 10-12, 2009 between Venice, LA and the West

Bay Diversion channel.

5

6

7

8

9

10

11

12

13

14

15

16

17

18

56

5550

49

Venice, LA


Venice, LA

1

4

2

3

Locations of bottom drag samples made on March 10, 2009 north of Venice, LA.


74,68

73

72

71

70

69

67

66

65

64

62

61

63

60

59

Locations of the bottom drag samples made on May 22, 2009 in Southwest Pass.


Bottom Drag 18

0

2

4

6

8

10

12

14

0.1 1 10 100 1000


% o

f Vol

ume Series1

Series2

Series3

Bottom Drag 17

0

0.5

1

1.5

2

2.5

3

3.5

4

0.1 1 10 100 1000


% o

f V

olu

me Series1

Series2

Series3

Bottom Sediment Grain Size Distributions

Right Descending Bank Above WBD

Left Descending Bank Across from Drag 17


Bed Sediment D50 ValuesReceiving Area


Bed Sediment D50 ValuesCubits Gap Area


Bed Sediment D50 ValuesSouth West Pass


108k0.47k

0.4k

24k

128k0.2k

0.4k

27k

18k17

0k April 22—23rd Line Total Q Sed Flux M2 (ft³/s) (Tons/Day)R-2.6 444,000 108 K 133 KR-2.8-RB 3,600 0.47 K .8 KR-3.5-RB 2,300 0.4 K .4KR-5.2 518,000 128 K 140KR-6.5-LB 4,700 0.4 K .7KR-6.4-RB 1,700 0.2 K .4KR-12.1 685,600 170 K 191KWBD 51,500 24 K 25kGP 81,000 27 K 50 kBCB 74,000 18 K 22 k

Q and Sediment Flux for Venice to below Cubit’s Gap


12.6k

144k

153k

May 5—6th

Line Total Q Sed Flux M2 (ft³/s) (Tons/Day)

R-5.2 504,000* 153.0 K 162.0 KWBD 42,000* 12.6 K 13.1 KR-4.5 454,000* 144.0 K 148.0 K

* Multiple Transects Averaged

Q and Sediment Flux Around the Diversion Cut


Line Total Q Sed Flux M2 (ft³/s) (Tons/Day)R-2.6 563,100 263.5K 276KR-2.8-RB 1,375 .157K .1K R-3.5-RB 2,300 .09K .1KR-4.5 675,500 325K 333 KR-5.2 794,400 333.5K 355 KR-6.5-LB 7,000 0.453K .5 KR-6.4-RB 2,400 0.22K .3 KR-9.5 795,000 324K 337 KR12.1 1,003,813 356K 428 KCGRP 11,000 2.8K 3.8 KCGBB 33,200 11K 14.8 KCGOP 17,500 3.7K 4.0 KCGMP 72,000 22K 28 KWBD 72,100 33K 34 KGP 104,600 39K 44KBCB 114,000 57K 50 K

Q and Sediment Flux form Venice to below Cubit’s Gap

263.5k

333 K

356k57k

39k

0.22k0.453k

33K

2.8k3.7k

22k

May 29—30th

11k

324k


104k

145.9k

191k23.4k

11.8k

0.0027k0.115k

14.3k

0.79k2.4k

5.7k

June 16—17th

0.9k

Line Total Q Sed Flux M2 (ft³/s) (Tons/Day)R-2.6 385,500 104 K 101 KR-5.2 568,000 145.9K 171 KR-6.5-LB 4,300 0.115 K .175 KR-6.4-RB 600 0.003 K 0 K R-12.1 698,500 191 K 200.0 KCGRP 7,300 0.79 K 1.1 KCGBB 21,000 2.4 K 3.4 KCGOP 9,000 0.9 K 1.1 KCGMP 50,000 5.7 K 8.6 KWBD 51,500 14.3 K 16.0 KGP 74,300 11.9 K 15.7 KBCB 72,100 23.4 K 18.0 K



Line Total Q Sed Flux M2 (ft³/s) (Tons/Day)R-2.6 269,000 14.4 K 14.3 KR-4.5 222,000 10.6 K 9.4 KR-5.2 245,000 13.2 K 13.4 KR-9.5 195,000 12.4 K 11.5 KR12.1 238,000 16.3 K 14.2 KCGRP 2,600 .09 K .1 KCGBB 5,600 .35 K .37 KCGOP 2,400 .06 K .07 KCGMP 24,000 .9 K 1.0 KWBD 28,000 1.8 K 1.5 KGP 29,000 1.4 K 1.7KBCB 51,000 2.9 K 7.9 K


14.4k

13.2 K

16.3k2.9k

1.4k

1.8K

.06k.09k

.9k

July 20__24th

.35k

12.4k


Observations• ~45% Total Discharge is lost to the multiple cuts from Venice to

below Cubit’s Gap with approximately 50% of the Suspended Sediment leaving the main Channel

• Bed material grain size in anchorage range from 0-800 microns• Suspended sediment concentrations range from 50-450 mg/l in the

vertical• Grain size in suspended sediments range from 0-100 microns w/

mean size at surface 8-9 microns and w/ mean grain size 1 foot above bed ~15 microns

US Army Corps of Engineers ® Engineer Research and Development Center West Bay Sediment Diversion...

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