Effect of meteorological conditions on PM10 concentrations in the middle reaches of the Yarlung Zangbo River, Tibet Plateau

Ma, Pengfei; Zhang, Zhengcai; Zhang, Yan; Lamu, Yixi; Za, Duo

doi:10.1007/s00704-022-04330-y

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…Our recent study indicated that the concentration of windblown particles >10 μm in diameter (PM 10 ) exceeded 50 μg m −3 for more than 100 days of the year in the middle reaches of the Yarlung Zangbo River (Ma et al, under review). Sand transport rates was largest above shifting sand near riverbanks (0.21 kg m −1 d −1 ) and was lowest above a floodplain grassland (0.03 kg m −1 d −1 ) (Zhang, Zhang, et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Aeolian sediment provenance and transport in the upper and middle reaches of the Yarlung Zangbo River, Tibet Plateau

Zhang

Ma²,

La³

et al. 2022

Basin Research

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Frequent and serious aeolian disasters occur in the upper and middle reaches of the Yarlung Zangbo River, which runs through the high-elevation Tibet Plateau. Sediment geochemical characteristics can be used as a proxy to identify the sediment's provenance. To determine the provenance of aeolian sediments in the river's basin, we analysed major and trace element contents from surface samples and local clastic rocks throughout the basin. We found that the major and trace elements differed between the middle reaches, upper reaches and regions south of the river. Major element contents were similar in the upper and middle reaches, but trace elements differed. Al 2 O 3 , MgO and Na 2 O concentrations increased from the upper reaches to the lower reaches, and in the lower reaches, MgO and Na 2 O were enriched compared with the crustal average. The similarities between samples in the lower part of the upper reaches and those in the middle reaches indicated that sediment transported by fluvial systems from the upper reaches were first deposited in the wide valleys near Xigaze, where they formed a large area of shifting sand. These deposits were then transported by the wind to the river's middle reaches, where they formed a large area of shifting sand. When we compared aeolian sediment in the middle reaches with the local clastic rocks, they appeared to be unrelated.The difference between sediments south of the river and those in the middle reaches means that the southern sediments were not transported to the middle reaches. Therefore, the aeolian sediment in the middle reaches of the Yarlung Zangbo River mainly came from the lower part of the upper reaches, not from the local clastic rocks.

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Section: Introductionmentioning

confidence: 99%

Aeolian sediment provenance and transport in the upper and middle reaches of the Yarlung Zangbo River, Tibet Plateau

Zhang

Ma²,

La³

et al. 2022

Basin Research

Self Cite

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Blown sand environment characteristics and bridge sand hazard mechanisms of expressways in the South Tibet Valley

Xie,

Zhang,

Pang

et al. 2024

Sci Rep

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South Tibet expressways are built in the Yalu Tsangpo valley along the route to high-altitude and cold–temperature valleys, which are the main environmental characteristics of the region. Given that the blown sand environment and its potential harm are unclear, targeted prevention and control are not conducive, but its absence would result in severe wind–sand hazards on these expressways. In this research, the blown sand environment of the South Tibet Valley and the mechanism of sand damage to expressway bridges were studied via field observations, wind tunnel experiments and numerical simulations. The sand–moving wind is mainly west wind. The sand–moving wind frequency, sand drift potential, and maximum possible sand transport quantity are high in winter and spring (November–April) and low in summer and autumn (May–October). The sand drift direction is in the east direction. Expressway bridges have a considerable impact on the near–surface blown sand environment, forming a zone for increasing the wind speed between the top of the slope shoulder of the windward side of the bridge to the center of the bridge abutment, forming a zone for weakening the wind speed between the − 3 H distances of the upwind direction to the bottom of the slope middle of the windward side of the bridge, further forming a zone for weakening the wind speed centered in the slope shoulder of the leeward side of the bridge. The wind speed within a distance of 40 H downwind direction of the bridge generally did not recover. The wind–sand flow is partially blocked when it passes through the bridge and accumulates near the bridge, which cause harm. The impact of the bridge on the blown sand environment in the downwind is greater than that in the upwind. The results of this study can provide a reference for preventing and controlling wind–sand hazards on South Tibet expressways.

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Effect of meteorological conditions on PM10 concentrations in the middle reaches of the Yarlung Zangbo River, Tibet Plateau

Cited by 2 publications

References 41 publications

Aeolian sediment provenance and transport in the upper and middle reaches of the Yarlung Zangbo River, Tibet Plateau

Aeolian sediment provenance and transport in the upper and middle reaches of the Yarlung Zangbo River, Tibet Plateau

Blown sand environment characteristics and bridge sand hazard mechanisms of expressways in the South Tibet Valley

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