Formation mechanism and development pattern of aeolian sand landform in Yarlung Zangbo River valley |
| |
| Authors: | Sen Li Guangmng Dong Jianyou Shen Ping Yang Xianwan Liu Yue Wang Heling Jin Qiang Wang |
| |
| Institution: | (1) Institute of Desert Research, Chinese Academy of Sciences, 730000 Lanzhou, China;(2) Xi’an State Key Laboratory of Loess and Quatemaq Geology, Chinese Academy of Sciences, 710054 Xi’an, China;(3) Lanzhou Meteorological Center, 730000 Lanehou, China |
| |
| Abstract: | Aeolian sand landforms in the Yarlung Zangbo River valley can be divided into 4 classes and 21 types. The river valley has
favourable environment conditions for the development of aeolian sand landforms. Simulation of MM4 mid-scale climate model
showed that the near-surface flow field and wind vector field during the winter half year in the river valley are generally
favourable for the aeolian sand deposition and as a whole they also affect the distribution mneu and sites of aeolian sand
landforms. Sand dunes and sand dune grouup in the river valley developed mainly in three ways, namely windward retarding deposition,
leeward back flow deposition and bend circumfluence deposition. Through alternating positive-reverse processes of sand dune
formation under wind actions and sand dune vanishing under water actions, sand dunes developed fmm primary zone thmugh main-body
zone then to vanishing zone where climbing dunes and falling dunes are declining and are even disappearing.
Project supported by the National Natural Science Foundation of China (Grant No. 49471009) and Xi’an State Key Laboratory
of Loess and Quaternary Geology (Grant No. 9401) |
| |
| Keywords: | Yarlung Zangbo River valley aeolian sand landform near-surface flow field positive-reverse development processes evolutional pattern |
| 本文献已被 SpringerLink 等数据库收录！ |
|
