Number Size Distribution and Concentration of Droplets Generated by Sailing Ships

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10507539" target="_blank" >RIV/00216208:11310/25:10507539 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=xfgMXV0G-B" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=xfgMXV0G-B</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.29227/IM-2025-02-03-04" target="_blank" >10.29227/IM-2025-02-03-04</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Number Size Distribution and Concentration of Droplets Generated by Sailing Ships

Popis výsledku v původním jazyce

Ship diesel engines are a significant source of aerosol nanoparticles on water bodies. The nanoparticles, significantly enriched with various environmental pollutants, are transported ashore by air currents or deposited on the water surface. The predominance of transport over deposition depends on the sedimentation rate of the nanoparticles. In general, the sedimentation rate of nanoparticles is very low, but can be significantly accelerated by scavenging nanoparticles on microdroplets. The mist of microdroplets, a kind of sea-spray aerosol, is generated by sailing ships through hull motion and/or propeller rotation. Therefore, the number and size of microdroplets are critical parameters for the environmental fate of the nanoparticles. The number size distribution and number concentration of microdroplets generated by sailing ships were measured using commercially available disdrometer mounted on the prow of an inflatable boat, which chased the ship. A Meteorological Particle Spectrometer (MPS) was deployed in the Baltic Sea, where a ship with a length of 140 m and a maximum diesel engine power of 7.9 MW was tracked. The distance between the ship and the MPS ranged from 40 to 800 m. The microdroplet number concentration was in the range of 8.2.10(-4)-3.1 cm(-3) and microdroplet size distribution exhibited mode at 0.05 - 0.10 mm. A Laser Precipitation Monitor (LPM) was used on the Vltava River in Prague, where four ships ranging in length from 30 to 50 m with maximum diesel engine power from 125 to 229 kW and a ferry 8.5 m long with engine power of 22 kW were measured. The distance from the ship stern to the LPM varied between 18 and 120 meters. Out of a total of 54 measurements made, 28 were evaluated. An average speed of the ships was 4.5 m.s(-1). The microdroplet number concentration ranged between 4.6 10(-5)-2.6.10(-2)cm(-3), microdroplets number size distributions always showed mode at 0.16 - 0.25 mm. Besides the difference of detection capabilities of the LPM and MPS, the differences between the sea and river experiments for droplet number concentrations and size distribution can be attributed to the difference in size and power of the ships being tracked.

Název v anglickém jazyce

Number Size Distribution and Concentration of Droplets Generated by Sailing Ships

Popis výsledku anglicky

Ship diesel engines are a significant source of aerosol nanoparticles on water bodies. The nanoparticles, significantly enriched with various environmental pollutants, are transported ashore by air currents or deposited on the water surface. The predominance of transport over deposition depends on the sedimentation rate of the nanoparticles. In general, the sedimentation rate of nanoparticles is very low, but can be significantly accelerated by scavenging nanoparticles on microdroplets. The mist of microdroplets, a kind of sea-spray aerosol, is generated by sailing ships through hull motion and/or propeller rotation. Therefore, the number and size of microdroplets are critical parameters for the environmental fate of the nanoparticles. The number size distribution and number concentration of microdroplets generated by sailing ships were measured using commercially available disdrometer mounted on the prow of an inflatable boat, which chased the ship. A Meteorological Particle Spectrometer (MPS) was deployed in the Baltic Sea, where a ship with a length of 140 m and a maximum diesel engine power of 7.9 MW was tracked. The distance between the ship and the MPS ranged from 40 to 800 m. The microdroplet number concentration was in the range of 8.2.10(-4)-3.1 cm(-3) and microdroplet size distribution exhibited mode at 0.05 - 0.10 mm. A Laser Precipitation Monitor (LPM) was used on the Vltava River in Prague, where four ships ranging in length from 30 to 50 m with maximum diesel engine power from 125 to 229 kW and a ferry 8.5 m long with engine power of 22 kW were measured. The distance from the ship stern to the LPM varied between 18 and 120 meters. Out of a total of 54 measurements made, 28 were evaluated. An average speed of the ships was 4.5 m.s(-1). The microdroplet number concentration ranged between 4.6 10(-5)-2.6.10(-2)cm(-3), microdroplets number size distributions always showed mode at 0.16 - 0.25 mm. Besides the difference of detection capabilities of the LPM and MPS, the differences between the sea and river experiments for droplet number concentrations and size distribution can be attributed to the difference in size and power of the ships being tracked.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

<a href="/cs/project/GF22-03426L" target="_blank" >GF22-03426L: Emise do atmosféry z lodní dopravy: Charakterizace, sledování a dopad na kvalitu mořské vody</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Inzynieria Mineralna

ISSN

1640-4920

e-ISSN

—

Svazek periodika

3

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

4

Strana od-do

nestránkováno

Kód UT WoS článku

001703631300016

EID výsledku v databázi Scopus

2-s2.0-105025578511