DRIFTING PARTICLE SIMULATOR FOR TRACKING CONTAMINATED SEDIMENT FROM STORMWATER DISCHARGE PLUMES

• US 20160239588A1
• Filed: 02/18/2015
• Published: 08/18/2016
• Est. Priority Date: 02/18/2015
• Status: Active Grant

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Oiler, Joathon Keith, Chadwick, David Bartholomew, Nicholson, Matthew Joseph
• Granted Patent: US 10,460,045 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30

Abstract

A drifting particle simulator buoy system for a stormwater discharge plume which includes a GPS unit for tracking the buoy GPS location at the surface of the plume and a drogue/winch unit including a drogue chute and winch package which is lowered to the seafloor at a controlled descent rate which is comparable to the descent rate of certain size sediment particles of interest within the stormwater discharge plume. The drogue chute controls lateral drift with the underwater current at approximately the same velocity of the sediment particles of interest. A control unit controls the drogue/winch unit, including controlling the speed of the chute/winch unit to mimic the settling rate of the sediment particles of interest. A bottom detection sensor determines the GPS location where the chute/winch package reaches the seafloor and determining the depositional footprint of contamination at the determined GPS location.

Claims

1. A drifting particle simulator buoy system for a stormwater discharge plume comprising:

a GPS unit for tracking the buoy GPS location at the surface of the plume;

a drogue/winch unit including a drogue chute and winch package which is lowered to the seafloor at a controlled descent rate which is comparable to the descent rate of certain size sediment particles of interest within the stormwater discharge plume;

the drogue chute controlling lateral drift with the underwater current at approximately the same velocity of the sediment particles of interest;

a control unit for controlling the drogue/winch unit, including controlling the speed of the chute/winch unit to mimic the settling rate of the sediment particles of interest; and

a bottom detection sensor for determining the GPS location where the chute/winch package reaches the seafloor and determining the depositional footprint of contamination at the determined GPS location.

2. The buoy system of claim 1 where the control unit includes a microcontroller, a rechargeable battery pack and a motor for controlling the drogue/winch unit.

3. The buoy system of claim 2 where the drogue chute is lowered to the seafloor at a controlled descent rate without operator intervention.

4. The buoy system of claim 3 including tracking three dimensional trajectories of sediment originating from the stormwater discharge plume to the final depositional location on the seafloor.

5. The buoy system of claim 4 including a pressure sensor for determining the vertical depth of the drogue/winch unit.

6. The buoy system of claim 5 wherein the control unit provides sediment contaminant analyses.

7. The buoy system of claim 5 wherein the control unit provides water sampling analyses.

8. The buoy system of claim 5 wherein the control unit provides conductivity analyses.

9. The buoy system of claim 5 wherein the control unit provides temperature analyses.

10. The buoy system of claim 5 where the descent rate of the buoy system is approximately 0.1-10 mm/s.

11. The buoy system of claim 10 where the control unit samples the sediment as the sediment traverses one or more water columns to determine how contaminant species change relative to distance and depth from the source.

12. The buoy system of claim 11 including a turbidity sensor for measuring how particle concentrations change as a function of distance and depth.

13. The buoy system of claim 12 in which the winch includes a cable to act as a telemetry cable for real-time transmission of data to the buoy.

14. The buoy system of claim 13 including satellite, cellular or radio based telemetry of the three dimensional position and sensor data from the buoy.

15. The buoy system of claim 14 including a buoyancy engine for lowering the buoy system.

16. The buoy system of claim 15 wherein the system is negatively buoyant and includes a slack line to provide slack to the buoy system.

17. A drifting particle simulator buoy system for a stormwater discharge plume comprising:

a GPS unit for tracking the buoy GPS location at the surface of the plume;

a drogue/winch unit including a drogue chute and winch package which is lowered to the seafloor at a controlled descent rate which is comparable to the descent rate of certain size sediment particles of interest within the stormwater discharge plume;

the drogue chute controlling lateral drift with the underwater current at approximately the same velocity of the sediment particles of interest;

a control unit for controlling the drogue/winch unit, including controlling the speed of the chute/winch unit to mimic the settling rate of the sediment particles of interest;

a bottom detection sensor for determining the GPS location where the chute/winch package reaches the seafloor and determining the depositional footprint of contamination at the determined GPS location;

the control unit providing the tracking of three dimensional trajectories of sediment originating from the stormwater discharge plume to the final depositional location on the seafloor.

18. The buoy system of claim 17 where the control unit samples the sediment as the sediment traverses one or more water columns to determine how contaminant species change relative to distance and depth from the source.

19. The buoy system of claim 18 including a turbidity sensor for measuring how particle concentrations change as a function of distance and depth.

20. The buoy system of claim 19 in which the winch includes a cable to act as a telemetry cable for real-time transmission of data to the buoy.