Characterization of the particle emission from a ship operating at sea using an unmanned aerial vehicle

Villa, Tommaso F.; Brown, Reece A.; Jayaratne, E. Rohan; Gonzalez, L. Felipe; Morawska, Lidia; Ristovski, Zoran D.

This research demonstrates the use of an unmanned aerial vehicle (UAV) to characterize the gaseous (inline-formulaCO2) and particle (10–500 nm) emissions of a ship at sea. The field study was part of the research voyage “The Great Barrier Reef as a significant source of climatically relevant aerosol particles” on board the RV Investigator around the Australian Great Barrier Reef. Measurements of the RV Investigator exhaust plume were carried out while the ship was operating at sea, at a steady engine load of 30 %.

The UAV system was flown autonomously using several different programmed paths. These incorporated different altitudes and distances behind the ship in order to investigate the optimal position to capture the ship plume. Five flights were performed, providing a total of 27 horizontal transects perpendicular to the ship exhaust plume. Results show that the most appropriate altitude and distance to effectively capture the plume was 25 m a.s.l. and 20 m downwind.

Particle number emission factors (EFinline-formulaPNs) were calculated in terms of number of particles emitted (no.) per weight of fuel consumed (kginline-formulafuel). Fuel consumption was calculated using the simultaneous measurements of plume inline-formulaCO2 concentration.

The calculated EFinline-formulaPN was inline-formula M6inlinescrollmathml normal 7.6 ± normal 1.4 × normal 10 normal 15 76pt14ptsvg-formulamathimgfbcbc783eaa90f3aff50c270c18ae67a amt-12-691-2019-ie00001.svg76pt14ptamt-12-691-2019-ie00001.png no. kginline-formula M7inlinescrollmathml normal fuel - normal 1 15pt17ptsvg-formulamathimg1fb23f0fc924bcde5e9d16af88d57853 amt-12-691-2019-ie00002.svg15pt17ptamt-12-691-2019-ie00002.png which is in line with those reported in the literature for ship emissions ranging from inline-formula0.2 to inline-formula6.2×1016 no. kginline-formula M10inlinescrollmathml normal fuel - normal 1 15pt17ptsvg-formulamathimgff2027efdd50e7470cc33b658bb35255 amt-12-691-2019-ie00003.svg15pt17ptamt-12-691-2019-ie00003.png .

This UAV system successfully assessed ship emissions to derive EFinline-formulaPN under real world conditions. This is significant as it provides a novel, relatively inexpensive and accessible way to assess ship EFinline-formulaPN at sea.

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Zitierform:

Villa, Tommaso F. / Brown, Reece A. / Jayaratne, E. Rohan / et al: Characterization of the particle emission from a ship operating at sea using an unmanned aerial vehicle. 2019. Copernicus Publications.

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