US Army Corps of Engineers ® Engineer Research and Development Center West Bay Sediment Diversion Work Plan Task 1 : Data Collection and Analysis December Thad Pratt CEERD-HF-FM
US Army Corps of Engineers ® Engineer Research and Development Center Data Collection Trips Data collection Trip 1, March 9-12, April, 5-6 May, 2009: Multi-beam and hydrodynamic (ADCP) surveys, bed samples and suspended sediment samples. Data collection Trip 2, 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.
US Army Corps of Engineers ® Engineer Research and Development Center Mississippi River Stage & Survey Dates
US Army Corps of Engineers ® Engineer Research and Development Center 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
US Army Corps of Engineers ® Engineer Research and Development Center Multi-beam Survey Coverage
US Army Corps of Engineers ® Engineer Research and Development Center Multi-beam Surveys of the West Bay Diversion Cut April Survey August Survey
US Army Corps of Engineers ® Engineer Research and Development Center Transect Lines
US Army Corps of Engineers ® Engineer Research and Development Center Survey Dates Apr May 5-6 May Jun 16-17Jul 21 Discharge North of Channel 550,738 ft3/s 500,448 ft3/s 740,062 ft3/s568,041 ft3/s ft3/s Discharge into Channel 46,514 ft3/s 42,011 ft3/s 68,373 ft3/s52,252 ft3/s31,000 ft3/s Discharge South of the Channel 509,966 ft3/s 454,715 ft3/s675,834 ft3/s485,332 ft3/s260,000 ft3/s Percentage discharge into the channel 8.4% 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
US Army Corps of Engineers ® Engineer Research and Development Center Discharges through the control volume that includes Cubit’s Gap Survey Dates April May June 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% Percentage of unaccounted discharge 3% 2% -4% 3.3%
US Army Corps of Engineers ® Engineer Research and Development Center 3D Velocity Mapping Coinciding with Suspended Sediment Samples
US Army Corps of Engineers ® Engineer Research and Development Center 3D Velocity Mapping in Vicinity of West Bay Diversion
US Army Corps of Engineers ® Engineer Research and Development Center 3D Velocity Mapping Inside West Bay Diversion
US Army Corps of Engineers ® Engineer Research and Development Center 3D Velocity Mapping in Vicinity of Cubit’s Gap
US Army Corps of Engineers ® Engineer Research and Development Center West Bay Diversion Depth Averaged Velocities April 2009
US Army Corps of Engineers ® Engineer Research and Development Center West Bay Diversion Surface Velocity April 2009
US Army Corps of Engineers ® Engineer Research and Development Center West Bay Diversion Bottom Velocity April 2009
US Army Corps of Engineers ® Engineer Research and Development Center Vertical Velocity Distribution within West Bay Diversion
US Army Corps of Engineers ® Engineer Research and Development Center Locations of suspended sediment samples, OBS measurements, and salinity measurements made on May 30, 2009.
US Army Corps of Engineers ® Engineer Research and Development Center River Transect just North of Diversion (June 17 th )
US Army Corps of Engineers ® Engineer Research and Development Center May 29 th Survey Range 5.2
US Army Corps of Engineers ® Engineer Research and Development Center Suspended Sediment Concentrations
US Army Corps of Engineers ® Engineer Research and Development Center 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
US Army Corps of Engineers ® Engineer Research and Development Center Drag and Push Core Sediment Samples taken on March in vicinity of WB and Cubit’s Gap
US Army Corps of Engineers ® Engineer Research and Development Center Drag and Push-core Samples taken on March 10-12, 2009 between Venice, LA and the West Bay Diversion channel.
US Army Corps of Engineers ® Engineer Research and Development Center Locations of bottom drag samples made on March 10, 2009 north of Venice, LA.
US Army Corps of Engineers ® Engineer Research and Development Center Locations of the bottom drag samples made on May 22, 2009 in Southwest Pass.
US Army Corps of Engineers ® Engineer Research and Development Center Bottom Sediment Grain Size Distributions Right Descending Bank Above WBD Left Descending Bank Across from Drag 17
US Army Corps of Engineers ® Engineer Research and Development Center Bed Sediment D50 Values Receiving Area
US Army Corps of Engineers ® Engineer Research and Development Center Bed Sediment D50 Values Cubits Gap Area
US Army Corps of Engineers ® Engineer Research and Development Center Bed Sediment D50 Values South West Pass
US Army Corps of Engineers ® Engineer Research and Development Center 108k 0.47k 0.4k 24k 128k 0.2k 0.4k 27k 18k 170k April 22—23rd Line Total Q Sed Flux M2 (ft³/s) (Tons/Day) R , K 133 K R-2.8-RB 3, K.8 K R-3.5-RB 2, K.4K R , K 140K R-6.5-LB 4, K.7K R-6.4-RB 1, K.4K R , K 191K WBD 51, K 25k GP 81, K 50 k BCB 74, K 22 k Q and Sediment Flux for Venice to below Cubit’s Gap
US Army Corps of Engineers ® Engineer Research and Development Center 12.6k 144k 153k May 5—6th Line Total Q Sed Flux M2 (ft³/s) (Tons/Day) R ,000* K K WBD 42,000* 12.6 K 13.1 K R ,000* K K * Multiple Transects Averaged Q and Sediment Flux Around the Diversion Cut
US Army Corps of Engineers ® Engineer Research and Development Center Line Total Q Sed Flux M2 (ft³/s) (Tons/Day) R , K 276K R-2.8-RB 1, K.1K R-3.5-RB 2,300.09K.1K R , K 333 K R , K 355 K R-6.5-LB 7, K.5 K R-6.4-RB 2, K.3 K R , K 337 K R12.1 1,003, K 428 K CGRP 11, K 3.8 K CGBB 33,200 11K 14.8 K CGOP 17, K 4.0 K CGMP 72,000 22K 28 K WBD 72,100 33K 34 K GP 104,600 39K 44K BCB 114,000 57K 50 K Q and Sediment Flux form Venice to below Cubit’s Gap 263.5k 333 K 356k 57k 39k 0.22k 0.453k 33K 2.8k 3.7k 22k May 29—30th 11k 324k
US Army Corps of Engineers ® Engineer Research and Development Center 104k 145.9k 191k 23.4k 11.8k k 0.115k 14.3k 0.79k 2.4k 5.7k June 16—17th 0.9k Line Total Q Sed Flux M2 (ft³/s) (Tons/Day) R , K 101 K R , K 171 K R-6.5-LB 4, K.175 K R-6.4-RB K 0 K R , K K CGRP 7, K 1.1 K CGBB 21, K 3.4 K CGOP 9, K 1.1 K CGMP 50, K 8.6 K WBD 51, K 16.0 K GP 74, K 15.7 K BCB 72, K 18.0 K Q and Sediment Flux form Venice to below Cubit’s Gap
US Army Corps of Engineers ® Engineer Research and Development Center Line Total Q Sed Flux M2 (ft³/s) (Tons/Day) R , K 14.3 K R , K 9.4 K R , K 13.4 K R , K 11.5 K R , K 14.2 K CGRP 2, K.1 K CGBB 5, K.37 K CGOP 2, K.07 K CGMP 24,000.9 K 1.0 K WBD 28, K 1.5 K GP 29, K 1.7K BCB 51, K 7.9 K Q and Sediment Flux form Venice to below Cubit’s Gap 14.4k 13.2 K 16.3k 2.9k 1.4k 1.8K.06k.09k.9k July 20 __ 24th.35k 12.4k
US Army Corps of Engineers ® Engineer Research and Development Center 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 microns Suspended sediment concentrations range from mg/l in the vertical Grain size in suspended sediments range from microns w/ mean size at surface 8-9 microns and w/ mean grain size 1 foot above bed ~15 microns