Grain-size distribution of surface sediments of climbing and falling dunes in the Zedang valley of the Yarlung Zangbo River, southern Tibetan plateau

Zhang, Jiaqiong; Zhang, Chunlai; Li, Qing; Xing-hui, Pan

doi:10.1007/s12040-018-1030-4

Cited by 11 publications

(13 citation statements)

References 31 publications

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“…The route form is mainly roadbed, and the main landform along the line is an east–west valley. Distributed in the valley are barchan dunes, exposed sandy land, gobi, climbing dunes, and shadow dunes [ 23 ]. The geographic coordinates of the observation site are 29°15′39″ N, 91°31′14″ E, with an altitude of 3562 m. Meteorological sensors present a surface height of 2 m, with wind speed, direction, temperature, and humidity recorded every 5 min ( Figure 2 ).…”

Section: Methodsmentioning

confidence: 99%

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Xie

Zhang

Pang

2022

IJERPH

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The Shannan wide valley section of the Sichuan–Tibet Railway is located in the middle reaches of the Yarlung Zangbo River, where sand hazard is severe. A wind tunnel simulation experiment was conducted by establishing a subgrade model and performing field observation to carry out research on the dynamic environment of blown sand and the sand hazard formation mechanism of subgrade in the Shannan wide valley. Observation results showed that the sand-moving wind of the Shannan wide valley was chiefly derived from the ENE direction, and the resultant sand transport direction was WSW. Wind speed, the frequency of sand-moving wind, the sand drift potential, and the maximum possible sand transport quantity were relatively high in the spring. Meanwhile, the dynamic of the wind-blown sand flow was further enhanced in the spring, particularly influenced by the flow action of the Yarlung Zangbo River. Thus, sand hazard mainly occurred in the spring. The Sichuan–Tibet Railway subgrade evidently changed the wind speed, the wind-blown sand flow field, and conditions of transport and accumulation. Within the distance of 5 times the model height in the windward direction and at the subgrade top center to 20 times the model height of the leeward direction was the wind speed deceleration zone, resulting in sand particle sediments. A wind speed acceleration zone appeared on the subgrade windward slope shoulder, resulting in wind-blown sand flow erosion. This study provides a scientific basis for sand hazard prevention and control in the Sichuan–Tibet Railway.

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Section: Methodsmentioning

confidence: 99%

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Xie

Zhang

Pang

2022

IJERPH

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“…The subgrade form of this section is all bridges, and the characteristics of the bridges are shown in Table 1. This section is located in the sandy area of the South Tibet valley with a high elevation and cold temperatures, and whose main landform types include plain sand land, Gobi, and climbing and falling dunes [13,14]. The observation site is located in the sand source area of the east side of this section (Figure 2), with geographic coordinates of 29 • 22 45" N, 90 • 54 33" E and an altitude of 3612 m. Meteorological sensors were installed at a surface height of 2 m to record the wind speed and direction in the locale every 5 min from September 2017 to August 2018.…”

Section: Field Observationmentioning

confidence: 99%

Wind Dynamic Environment and Wind Tunnel Simulation Experiment of Bridge Sand Damage in Xierong Section of Lhasa–Linzhi Railway

Xie

Han

et al. 2020

Sustainability

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The Lhasa–Linzhi Railway is located in the sandy area of the South Tibet valley, with high elevation and cold temperature. The Xierong section is a bridge section where blown sand hazards are severe. However, the disaster-causing mechanism of blown sand hazards in this section is currently unclear, thereby hindering targeted sand prevention and control. To address this problem, the wind dynamic environment of and causes of sand damage in this section are investigated through the field observation of the locale and a wind tunnel simulation experiment. Results show that the dominant sand-moving wind direction in the Xierong section is SSE. The wind speed, frequency of sand-moving wind, sand drift potential (DP), and maximum possible sand transport quantity (Q) in this section are relatively high during spring (March to May) and low during other seasons. The yearly resultant sand transport direction (RDD, RA) is SW. The angle between the route trend of this section and the sand transportation direction is 30°–45°, and the sand source is located in the east side of the railway. During spring, sand materials are blown up by the wind, forming blown sand flow and movement from the NE to SW direction. Increased wind speed area is formed between the top of the slope shoulder of the windward side of the bridge and the downwind direction of 3H, causing blown sand erosion. Meanwhile, weakened wind speed areas are formed within the distance of -3H at the upwind direction and from the downwind direction of the 3H to 20H of the bridge. These areas accumulate sand materials at the upwind and downwind directions of the bridge, thereby resulting in blown sand hazards. This research provides a scientific basis for the prevention and control of sand damage in the locale.

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“…Research relating to modern aeolian deposits has focused mainly on revealing granulometric characteristics that show drastic variations among different valleys (Jin et al, 2000;Kaiser et al, 2010;Lu, Xiang, Jiang, Liu, & Zeng, 2008;Sun et al, 2007;Zhang, Zhang, Li, & Pan, 2019;Zheng et al, 2009;Zhou et al, 2021;Zhou, Zhang, & Liu, 2012), besides which, grain size decreases with elevation for each climbing dune (Zhou et al, 2021). In the Zhongba valley, grain size ranges between 250 and 177 μm (Zhou et al, 2021).…”

Section: Aeolian Processes Along the Yarlung Rivermentioning

confidence: 99%

Aeolian sand dunes alongside the Yarlung River in southern Tibet: A provenance perspective

et al. 2020

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The potential interactions between aeolian and fluvial systems are critical in understanding environmental change. Whether aeolian products originated from the river depends on the river characteristics and wind regimes. In southern Tibet, aeolian sand dunes are widespread along the Yarlung River, and thus provide an ideal example to explore the relationships between large fluvial systems and aeolian products.Although previous studies postulated that those aeolian products were originated from the Yarlung River, few empirical data actually exist to support this idea. We analysed the spatial pattern, sand transportation directions, and granulometric characteristics of the sand dunes to evaluate the potential influence of the Yarlung River on the aeolian processes. Comparison of the dune field distribution against channel width and longitudinal profile of the Yarlung River shows that sand dunes are clustered at the wide and flat segments of the river. Analyses of >4,600 sand dune orientations using Google Earth imagery show that the dunes located at the southern and northern sides of the Yarlung River demonstrate opposite sand transportation directions that generally point against the river. This suggests that the sand grains probably originated from the river. Grain size distributions from dune samples show unimodal or unimodal-like patterns. This means that each sand dune field was dominantly fed by a simple transportation process rather than by compound processes from smaller-level fluvial systems, which in turn implies that the Yarlung River was the most possible candidate for the provenance of these aeolian deposits. This study provides new constraints to demonstrate that the Yarlung River provides both accommodation space and sorted fluvial sand for the aeolian sand dunes along the river.

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Grain-size distribution of surface sediments of climbing and falling dunes in the Zedang valley of the Yarlung Zangbo River, southern Tibetan plateau

Cited by 11 publications

References 31 publications

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Wind Dynamic Characteristics and Wind Tunnel Simulation of Subgrade Sand Hazard in the Shannan Wide Valley of the Sichuan–Tibet Railway

Wind Dynamic Environment and Wind Tunnel Simulation Experiment of Bridge Sand Damage in Xierong Section of Lhasa–Linzhi Railway

Aeolian sand dunes alongside the Yarlung River in southern Tibet: A provenance perspective

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