Vertical Distribution of Wind-eroded Dust within 50m High at Minqin Dust Source Area in North-Western China

DOI

10.2991/icsd-16.2017.56How to use a DOI?

Keywords

sand dust; vertical distribution; source area.

Abstract

15 Aeolian Dust Samplers (ADS) were fixed to a 50m high steel tower above the ground at Minqin sand-dust source area in north-western China, dust was collected and treated respectively after each sand-dust storm event and end of the month in a year round. The vertical distribution of dust mass monthly and timely agreed the function of qh=a+bexp(-h/c), it showed that the dust particle concentration decays exponentially with the height. The correlation between dust mass and height was reasonably well. a, b and c were Coefficients, mainly driven by wind velocity, a and b positively increased with wind velocity, b was more obvious and sensitive than a, implying that the dust particle concentration decays more rapidly as wind velocity decreases. However, c decreased with wind velocity increasing and negative with a and b. The maximum and mean dust particle size was reduced with the height increase and varied with wind velocity. The standard deviation ( I) of dust particle size distribution had an increasing tendency with the height from poorly to very poorly sorted; all skewness (SkI) was very positively fine skewed; kurtosis (KG) had a reduced tendency with the height from very leptokurtic to leptokurtic. It all revealed that dust particles exists from local to remote areas extensively. Minqin is not only a main dust source area but also a main corridor of sand-dust storms in north-western China.

Copyright

© 2017, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Duo-Qing Man
AU  - Shi-Zeng Liu
AU  - De-Lu Li
AU  - Zi-Zhu Yan
AU  - Qing-Zhong Zheng
AU  - Yin-Ke Li
AU  - Yuan-Yan Wang
PY  - 2016/12
DA  - 2016/12
TI  - Vertical Distribution of Wind-eroded Dust within 50m High at Minqin Dust Source Area in North-Western China
BT  - Proceedings of the 2nd 2016 International Conference on Sustainable Development (ICSD 2016)
PB  - Atlantis Press
SP  - 255
EP  - 261
SN  - 2352-5401
UR  - https://doi.org/10.2991/icsd-16.2017.56
DO  - 10.2991/icsd-16.2017.56
ID  - Man2016/12
ER  -