Formation mechanism and development pattern of aeolian sand landform in Yarlung Zangbo River valley

Li, Sen; Dong, Guangmng; Shen, Jianyou; Yang, Ping; Liu, Xianwan; Wang, Yue; Jin, Heling; Wang, Qiang

doi:10.1007/bf02878964

Cited by 49 publications

(41 citation statements)

References 2 publications

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“…Studies showed that the causes and development of aeolian desertification in the Yarlung Zangbo River basin is one process which is based on slow natural desertification and unreasonable human activities which accelerated and aggravated such processes (Dong et al, 1995;Shen, 1998;Li et al, 1999;Dong et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

“…Land desertification on the Tibetan Plateau has attracted worldwide concern (Zou et al, 2002;Dong, 2004;Liu et al, 2005;Li et al, 2006;Xue et al, 2009;You et al, 2010). Aeolian sandy land mainly resulted from land desertification was described as one of the most critically important global problems due to its impact on environmental, economy and society (Warren, 1993;Helldén and Topptrup, 2008;Xue et al, 2009), and many researchers have used the changes of aeolian sandy land area as one of developing indicators of land desertification process (Yang, 1984;Dong et al, 1995;Liu et al, 1997;Shen, 1998;Li et al, 1999).…”

Section: Introductionmentioning

confidence: 98%

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Dynamics of aeolian sandy land in the Yarlung Zangbo River basin of Tibet, China from 1975 to 2008

Weishou

Sun

et al. 2012

Global and Planetary Change

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Dynamics of aeolian sandy land in the Yarlung Zangbo River basin of Tibet, China from 1975 to 2008

Weishou

Sun

et al. 2012

Global and Planetary Change

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“…A comparative study of sand dunes on the western coast of Hainan Island with inland desert dunes shows that both have roughly the same dynamic processes (Li and Guan, 1996;Li et al, 1997;Mckee, 1966;Pey and Tosar, 1990;Tsoar, 1983a;Wu et al, 2003;Zhu et al, 1981). However, because of the complex interactions among dynamic forces produced by the sea, the land (complex terrain and variations in the availability and gradation of sand), terrestrial water (i.e., rivers), and the atmosphere in the coastal zone, together with plentiful or less plentiful sand sources, coarse sand grains, and a wide range of grain diameters, the development of sand dunes is more diversified along the western coast, leading to a wider range of dune shapes than those in inland deserts.…”

Section: Shapes Of Dunes On the Western Coast Are More Diversified Anmentioning

confidence: 95%

A wind tunnel simulation of the dynamic processes involved in sand dune formation on the western coast of Hainan Island

Liu²,

Li³

et al. 2007

J. Geogr. Sci.

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The western coast of Hainan Island exhibits a savanna landscape. Many types of sand dunes, including transverse dune ridges, longitudinal dune ridges, elliptical dunes, coppice dunes, and climbing dunes, are widely distributed in the coastal zone. In winter, high-frequency and high-energy NE winds (dominant winds) are prevalent, with a resultant drift direction (RDD) of S35.6°W. In spring, low-frequency and low-energy SW secondary winds prevail, with a RDD of N25.1°E. Wind tunnel simulations revealed that the airflow over the dune surface is the main factor controlling the erosion and deposition patterns of dune surfaces and the morphological development of dunes. In the region's bidirectional wind environment, with two seasonally distinct energy levels, the airflow over the surface of elliptical dunes, barchan dunes, and transverse dune ridges will exhibit a transverse pattern, whereas the airflow over longitudinal dunes ridges exhibits a lateral pattern and that over climbing dunes exhibits a climbing-circumfluent pattern. These patterns represent different dynamic processes. The coastal dunes on the western coast of Hainan Island are influenced by factors such as onshore winds, sand sources, coastal slopes, rivers, and forest shelter belts. The source of the sand that supplements these dunes particularly influences the development pattern: when there is more sand, the pattern shows positive equilibrium deposition between dune ridges and dunes; otherwise, it shows negative equilibrium deposition. The presence or absence of forest shelter belts also influences deposition and dune development patterns and transformation of dune forms. Coastal dunes and inland desert dunes experience similar dynamic processes, but the former have more diversified shapes and more complex formation mechanisms.

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“…The Qinghai-Tibet Plateau also has large climbing dunes (Li et al, 1997;Liu et al, 1999), but their morphological characteristics and formation mechanisms are different from those of sand shadow dunes. Climbing dunes form on the windward slopes of obstacles, whereas sand shadow dunes form in their lees.…”

Section: Fig 17 Formation Mechanism Of Sand Shadow Dunes ((A) Is Sidmentioning

confidence: 98%

Morphology and formation mechanism of sand shadow dunes on the Qinghai-Tibet Plateau

Xiao

Yao

et al. 2014

J. Arid Land

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The formation and development of dunes depend on wind-blown sand movement which is affected by the characteristics of sand material, topography, wind regimes and other factors. In this paper, we investigated two sand shadow dune groups in Shigatse and Za'gya Zangbo of Tibet and an individual dune in Da Qaidam of Qinghai, and analyzed their topographies and morphologies, and the physical characteristics of the sand, wind regime and sand transport. Formed under harsh conditions behind hills, these mature sand shadow dunes are hundreds of meters long, have significant ridges and crescent dunes downwind, and have a hill pass on one or both sides. Wind tunnel experiments revealed that the hill gap and wind velocity are important factors in the formation of these dunes. Sand shadow dunes formed only when the gap spacing is two-thirds of the hill height. When wind velocities are 20 m/s, the sand body is divided into two parts. The hill pass allows the transport of sand by wind, creating a "narrow-pipe effect", which causes the transported material to gradually accumulate in the center of the shadow zone. We observed that the following are needed for sand shadow dunes to form: (1) strong winds, sufficient sand, suitable obstacles and a dry climate; (2) one or both sides of the obstacle forming the shadow zone must have a hill pass; and (3) the windward side of the obstacle must have a wide, flat area, providing adequate spacing for wind flow and transport of material and the leeward side must have a sufficiently broad, flat area to allow the release of the transported material. Research results on these newly discovered dunes on the Qinghai-Tibet Plateau could contribute to the understanding of dune geomorphology.Citation: JianHua XIAO, JianJun QU, ZhengYi YAO, YingJun PANG, KeCun ZHANG. 2015. Morphology and formation mechanism of sand shadow dunes on the Qinghai-Tibet Plateau. Journal of Arid Land, 7(1):

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Formation mechanism and development pattern of aeolian sand landform in Yarlung Zangbo River valley

Cited by 49 publications

References 2 publications

Dynamics of aeolian sandy land in the Yarlung Zangbo River basin of Tibet, China from 1975 to 2008

Dynamics of aeolian sandy land in the Yarlung Zangbo River basin of Tibet, China from 1975 to 2008

A wind tunnel simulation of the dynamic processes involved in sand dune formation on the western coast of Hainan Island

Morphology and formation mechanism of sand shadow dunes on the Qinghai-Tibet Plateau

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