US 9,810,678 B2
Drifting exposure system for sampling stormwater discharge plumes
David Bartholomew Chadwick, San Diego, CA (US); Jonathon Keith Oiler, San Diego, CA (US); and Matthew Joseph Nicholson, San Diego, CA (US)
Assigned to The United States of America as represented by the Secretary of the Navy, Washington, DC (US)
Filed by David Bartholomew Chadwick, San Diego, CA (US); Jonathon Keith Oiler, San Diego, CA (US); and Matthew Joseph Nicholson, San Diego, CA (US)
Filed on Feb. 9, 2015, as Appl. No. 14/616,988.
Prior Publication US 2016/0231302 A1, Aug. 11, 2016
Int. Cl. G01N 1/12 (2006.01); G01N 33/18 (2006.01); G01N 1/20 (2006.01)
CPC G01N 33/1886 (2013.01) [G01N 1/12 (2013.01); G01N 1/20 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A drifting buoy sampler system for a stormwater discharge plume formed from stormwater discharged into coastal waters, the system comprising:
a surface float;
a winch system operatively coupled to the surface float via a slack line;
a drogue chute connected to the winch system;
an instrument package, wherein the winch system is mounted on the instrument package, and wherein the instrument package is configured to control a descent rate of the winch system, the drogue chute, and the instrument package toward a seafloor along a trajectory that mimics a sediment particle of a desired size; and
wherein the instrument package comprises a microcontroller operatively coupled to the winch system, a pressure sensor configured to output pressure data to the microcontroller, and a bottom detection sensor communicatively coupled to the microcontroller, wherein the microcontroller is configured to control the descent rate of the winch system, the drogue chute, and the instrument package based on the pressure data and to record the time at which the winch system, the drogue chute, and the instrument package reach the seafloor.