TY - JOUR
T1 - The horizontal and vertical characteristics of Aeolian dust from riverbed
AU - Syu, Jin Yuan
AU - Cheng, Yu Chih
AU - Kao, Yuan Yi
AU - Liang, Chi Sung
AU - Yan, Yeou Lih
AU - Lai, Chane Yu
AU - Chang, Chang Tang
AU - Chen, Chih Chieh
AU - Young, Chea Yuan
AU - Wu, Yee Lin
AU - Lin, Wen Yinn
N1 - Funding Information:
The data in this field study were all collected and analyzed by the authors. All authors extremely thank for the generosity support from Environmental Protection Administration and Ministry of Science and Technology, Taiwan (grant numbers NSC 99-EPA-M-008-001). Besides, we also thank the support from Central Weather Bureau, which maintains the weather monitoring and helps us to judge whether go for sampling or not. The present study would not have been completed without the support of those departments.
Publisher Copyright:
© Taiwan Association for Aerosol Research.
PY - 2016/12
Y1 - 2016/12
N2 - Arid riverbed is an important source of Aeolian dust to influence the atmosphere of nearby village or downtown. In general, Aeolian dust pertains to wind activity in the study of geology, environment and meteorology on particle suspension. This field study set the horizontal/vertical sampling system up in order to investigate the Aeolian dust dimensional distribution properties from the riverbed of the Jhuoshuei River. In addition, the study utilized the unmanned aerial vehicle (UAV) imagery to discriminate the covering condition of riverbed. The results revealed that the percentage of riverbed covering conditions, including bare zone, wetlands, green covering and water covering was about 50.1, 15.7, 16.8 and 17.4%, respectively, on January 5th, 2011. Two Aeolian dust cases from riverbed were measured on November 26th, 2010 and January 15th, 2011. First sampling case was under slower wind speed, and the total particulate matter (PM) concentration in vertical sampling was almost decreased with increasing sampling height, however, the phenomena of second case (faster wind speed) was just on the contrary. Besides, Aeolian dust was distributed in a bimodal or a multimodal curve, and the main peak size was above 10 µm. Mode size of suspension particle diameter was increased as the wind speed increased (14.8 µm/ first case; 21.3 µm/ second case). The total mass concentration ratio of south site to source site (one meter height) was about 1:9 in first case and about 1:3 in second case. Comparing with those two cases, the faster the wind is, the shorter the surface roughness height is (3.08 mm/ first case; 1.07 mm/ second case). Besides, as the wind speed increasing, the friction velocity was also increased (0.33 m s−1/ first case; 0.68 m s−1/ second case). Consequently, this study clued the spatial variability of river dust events, which can further aid the site investigating, forecasting and preventing of dust influences.
AB - Arid riverbed is an important source of Aeolian dust to influence the atmosphere of nearby village or downtown. In general, Aeolian dust pertains to wind activity in the study of geology, environment and meteorology on particle suspension. This field study set the horizontal/vertical sampling system up in order to investigate the Aeolian dust dimensional distribution properties from the riverbed of the Jhuoshuei River. In addition, the study utilized the unmanned aerial vehicle (UAV) imagery to discriminate the covering condition of riverbed. The results revealed that the percentage of riverbed covering conditions, including bare zone, wetlands, green covering and water covering was about 50.1, 15.7, 16.8 and 17.4%, respectively, on January 5th, 2011. Two Aeolian dust cases from riverbed were measured on November 26th, 2010 and January 15th, 2011. First sampling case was under slower wind speed, and the total particulate matter (PM) concentration in vertical sampling was almost decreased with increasing sampling height, however, the phenomena of second case (faster wind speed) was just on the contrary. Besides, Aeolian dust was distributed in a bimodal or a multimodal curve, and the main peak size was above 10 µm. Mode size of suspension particle diameter was increased as the wind speed increased (14.8 µm/ first case; 21.3 µm/ second case). The total mass concentration ratio of south site to source site (one meter height) was about 1:9 in first case and about 1:3 in second case. Comparing with those two cases, the faster the wind is, the shorter the surface roughness height is (3.08 mm/ first case; 1.07 mm/ second case). Besides, as the wind speed increasing, the friction velocity was also increased (0.33 m s−1/ first case; 0.68 m s−1/ second case). Consequently, this study clued the spatial variability of river dust events, which can further aid the site investigating, forecasting and preventing of dust influences.
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U2 - 10.4209/aaqr.2016.08.0347
DO - 10.4209/aaqr.2016.08.0347
M3 - Article
AN - SCOPUS:85002168975
SN - 1680-8584
VL - 16
SP - 3026
EP - 3036
JO - Aerosol and Air Quality Research
JF - Aerosol and Air Quality Research
IS - 12
ER -