Wind velocity and dispersion/advection-diffusion of artificial droplets and droplet nuclei in a domed all-weather multi-purpose stadium

被引：0

作者：

Shinohara, Naohide ^{[1
]}

Kurihara, Noboru ^{[2
]}

Naito, Wataru ^{[1
]}

Iwai, Aya ^{[2
]}

Yasutaka, Tetsuo ^{[3
]}

Morioka, Toshihiro ^{[2
]}

Takatsuji, Toshiyuki ^{[2
]}

Ogata, Masayuki ^{[4
]}

Tatsu, Koichi ^{[1
,5
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Res Inst Sci Safety & Sustainabil RISS, 16-1 Onogawa, Tsukuba, Ibaraki 3058569, Japan

[2] Natl Inst Adv Ind Sci & Technol NMIJ AIST, Natl Metrol Inst Japan NMIJ, 1-1-1 Umezono, Tsukuba, Ibaraki 3058563, Japan

[3] Geol Survey Japan, Natl Inst Adv Ind Sci & Technol AIST, 1-1-1 Higashi, Tsukuba, Ibaraki 3058567, Japan

[4] Tokyo Metropolitan Univ, 1-1 Minami Osawa, Hachioji, Tokyo 1920397, Japan

[5] Isuzu Motors Ltd, 8 Tsuchidana, Fujisawa, Kanagawa 2528501, Japan

来源：

SCIENTIFIC REPORTS | 2024年 / 14卷 / 01期

关键词：

Coronavirus infection 2019 (COVID-19); Mass-gathering events (MGEs); Transmission risk; Infection risk; Cough simulator; Face mask; EXPOSURE;

D O I：

10.1038/s41598-024-76806-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

To evaluate the COVID-19 infection risk and the effectiveness of countermeasures at mass-gathering events, we measured the dispersion and advective diffusion of artificial droplets and artificial droplet nuclei at the Tokyo Dome, Japan (capacity 55,000 people). We also measured and evaluated the effectiveness of wearing masks and increasing the space between seating areas. If people were seated facing forward, artificial droplets did not reach the mouths of surrounding people, suggesting low risk of droplet transmission. For an artificially generated cough or sneeze, the volume of droplets deposited on the hair, back of the neck, and back of the human in front, and the backs of the seats in front, decreased by two to three orders of magnitude when a mask was worn, regardless of the type of mask. However, when the mask was worn with the nose out, the amount deposited on the back of the seat in front was reduced by only 17%. Even in seats with the highest particle concentration in the vicinity of the source, only 0.097%-0.24% of the generated droplet nuclei (1.0-3.0 mu m) from the source were inhaled. Our results suggest that the infection risk at the Tokyo Dome via droplet and airborne transmission was low.

引用

页数：14