Variation in grain-size characteristics as a function of wind direction and height in the Sanlongsha dune field of the northern Kumtagh Desert, China

Yang, Zhuanling; Qian, Guangqiang; Han, Zhiwei; Dong, Zhibao; Luo, Wenhao; Zhang, Zhengcai; Lu, Junfeng; Liang, Aimin; Tian, Min

doi:10.1016/j.aeolia.2019.06.004

Cited by 18 publications

(15 citation statements)

References 35 publications

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“…This vertical variation of S K is consistent with the findings of Farrell et al ( 2012), Tan et al (2014), Z. Yang et al (2019), and Williams (1964). The vertical variation of K G is analogous to that of M z and similar to that observed by Farrell et al (2012), Tan et al (2014), and Z.…”

Section: Discussionsupporting

confidence: 91%

“…(2014), and Z. Yang et al. (2019). Folk and Ward (1957) indicated that sediments are characteristically leptokurtic and positively skewed when they are deposited near their source or when sediment supply is abundant.…”

Section: Discussionmentioning

confidence: 99%

“…(2014), Z. Yang et al. (2019), and Williams (1964). The vertical variation of K G is analogous to that of M z and similar to that observed by Farrell et al.…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have investigated the vertical and horizontal distribution of sediment flux and concentration and velocity of aeolian sediments (e.g., Bhutto et al., 2022; Farrell et al., 2012; Miri et al., 2017, 2019; Miri & Webb, 2022; Tan et al., 2014; P. Yang et al., 2007, Z. Yang et al., 2019). However, few studies have assessed how vegetation can influence the grain size distribution of sediments during transport (Dang et al., 2014; J. Li et al., 2019; Meng et al., 2014; Wang, Pan et al., 2021; Yanlong et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

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The impact of a multiple‐row Tamarix windbreak on grain size parameters of aeolian sand flux

Miri,

Webb

2024

Soil Science Soc of Amer J

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Understanding the effects of windbreaks on aeolian sediment transport rates, and the size distribution of aeolian sediments transported through them, is important for designing windbreaks to optimize their wind erosion mitigation benefits. This field study determines the size distribution of aeolian sediments upwind (x = −100 m), within (x = 100 and 256 m) and downwind (x = 448 and 560 m) (where x is the distance from the first row of windbreak) of a multi‐row Tamarix windbreak as the basis for further investigation of the influence of vegetation on aeolian sediment characteristics. The volumetric percentage of grains around the peaks of 100 and 20–30 µm showed variability with distance and between the three measured events. We found that the vertical distribution of grain size parameters indicated that mean grain size (Mz) may decrease with height upwind of the windbreak, and inflections were observed in the profiles of sorting (σ1), skewness (SK), and kurtosis (KG) within the windbreak, which may be attributable to blocking and trapping effect of the vegetation. Sediments were poorly sorted with the distributions of grain sizes being fine‐skewed and leptokurtic. The horizontal distribution of grain size indicated that Mz increased from x = −100 m to x = 100 m and then decreased at x = 256 m, indicating that the windbreak was unable to retain small particles. The windbreak could trap particle sizes <50 µm and particles >50 µm transported to downwind region of windbreak. Within the windbreak, SK and KG increased, and σ1 decreased. Downwind of the windbreak (at x = 448 and 560 m), Mz and KG increased, and σ1 and SK decreased. The results of the current study provide preliminary information on the variability of aeolian sediment grain sizes during transport relative to vegetation and suggest that multirow windbreaks could influence downwind particulate matter size concentrations and soil health.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

“…(2014), Z. Yang et al. (2019), and Williams (1964). The vertical variation of K G is analogous to that of M z and similar to that observed by Farrell et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The impact of a multiple‐row Tamarix windbreak on grain size parameters of aeolian sand flux

Miri,

Webb

2024

Soil Science Soc of Amer J

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“…The grain size characteristics of the dust particles not only influence their accumulation and transport but also reveal the material composition of the sediments in the source area. Therefore, the analysis of grain size is a necessary link to dust emission [26][27][28]. Based on the National Environmental Protection Standards of China (HJ 633-2012), the ambient air quality can be divided into six grades (Table 2) [29].…”

Section: An Overview Of Dust Pollution Based On Ground Observationsmentioning

confidence: 99%

Dust Characteristics Observed by Unmanned Aerial Vehicle over the Taklimakan Desert

Zhou

Liu

et al. 2022

Remote Sensing

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Based on observations from the Unmanned Aerial Vehicle (UAV) together with an environmental particulate matter analyzer (Grimm-180) and Global Positioning System (GPS) sounding balloons, the vertical structure of dust with different particle sizes was explored over the Taklimakan Desert (TD) during an intensive observation from 1 July 2021 to 31 July 2021. The power functions were fitted between the particle counts and particle sizes, indicating negative correlations with an R2 higher than 0.99 under different dust pollution conditions in Tazhong (TZ). The dust concentrations show a sharp vertical increase over the TD during dust pollution; however, more particles with larger sizes are entrained into the air in TZ compared with Minfeng (MF). The total solar radiation during dust pollution days is significantly weakened, accompanied by major modifications in the temperature stratification, which were characterized by low-level cooling (with −2.71 K mean intensity) and high-level heating (with +0.70 K mean intensity). On clear days, the average convective boundary layer (CBL) heights at the TZ and MF are approximately 3.94 and 2.84 km, respectively, and the average stable boundary layer (SBL) height at the TZ and MF are approximately 0.19 and 0.14 km, respectively. With the increasing dust pollution level, the CBL height decreases rapidly while the SBL height shows the opposite trend. The unique ultra-high atmospheric boundary layer structure in daytime provides beneficial conditions for the suspension and vertical transportation of dust over TD. Moreover, a negative correlation between the CBL height and near-surface PM10/PM2.5/PM1.0 concentration in TD is revealed by power function fittings.

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UAV‐SfM‐based field quantification of barchan dune celerity and morphodynamics in Gonghe Basin

Shao,

Luo,

Che

et al. 2024

Earth Surf Processes Landf

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Barchan dunes do not often coexist with grasslands. However, in Gonghe Basin, north‐eastern part in Qinghai‐Tibetan Plateau (QTP), China, many barchan dunes are distributed on the grassland at high altitude. Identifying celerity and morphodynamics of barchan dunes and exploring the interaction between barchans and grassland landscape can help us better understand aeolian system sand mitigate damages. In this work, we tracked dune celerity and observed three‐dimensional changes of symmetrical and asymmetrical barchan dunes in Ertala based on high‐resolution UAV‐SfM reconstruction in short‐term monitoring and discussed the factors influencing dune celerity and deformation at high altitude. The results revealed that the barchan dunes are highly mobile with an average celerity of 0.85 m/M for the whole study area. Based on observations of dune morphology and dynamics, we found the following: (1) The dune deformation degree in a short time is not large but is widespread, especially in the elongated arm of asymmetric dune. The deformation of symmetric dune is symmetrical, whereas that of dune with extended horn is asymmetrical; (2) the sand supply, vegetation and airflow at low air density all influence the celerity and deformation degree in the development of barchan dunes; (3) the asymmetric airflow and sediment supply are important cause of dune asymmetry. The above results help us understand the deformation of barchan dune from the three‐dimensional, especially the difference reflected by the symmetry of barchan dune at high altitude.

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Variation in grain-size characteristics as a function of wind direction and height in the Sanlongsha dune field of the northern Kumtagh Desert, China

Cited by 18 publications

References 35 publications

The impact of a multiple‐row Tamarix windbreak on grain size parameters of aeolian sand flux

The impact of a multiple‐row Tamarix windbreak on grain size parameters of aeolian sand flux

Dust Characteristics Observed by Unmanned Aerial Vehicle over the Taklimakan Desert

UAV‐SfM‐based field quantification of barchan dune celerity and morphodynamics in Gonghe Basin

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