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The world's largest mobile desert in which

85963122010-02-06 02:01:33 +0000 #1

skyzhiwen2010-02-06 02:09:25 +0000 #2
Taklimakan Desert

Kramer dry desert landscape to shape the modern camp ground force was the wind, the wind under the action of moving sand dunes. Velocity under the sand dunes can be divided into: ① slow forward a value of less than 1 m / year, within the vast areas such as deserts. ② medium speed forward value of 1

5 m / year, such as the western and northern parts of the desert and other places. ③ fast forward a value of 6

10 m / year, such as the desert southwest and south-east and so on. ④ fast forward a value of greater than 10 m / year, the largest at 40 meters / year or more, such as the Yecheng Pishan between Qiemo Ruoqiang, the Piedmont plain sand dunes and so on.

Scholars say that sand flow "due to the wind the sky, and sand movement into the stream." With the surface morphology is different from sand removal and concentration of the corresponding changes in height. A description of the main indicators, one is "sand flow structure", that is, the amount of sediment with a high degree of change, one "wind-blown sand sediment strength" (transport rate) for the characterization of the amount of material to carry sand.

Affect the two indicators of factors, including wind size, sand size, sand, moisture content, terrain position, vegetation conditions, air stability, etc. Although a theoretical formula, but there are still a wide gap between the actual, still need to adopt the analysis of observational data on the ground, revealing the specific parameters of a particular sand area.

The study found that the Taklimakan Desert sand flow structure caused by differences in topography and the main factor affecting wind speed. Transverse dune chain, longitudinal sand ridges and Pincha ground, sand flow and sediment yield and height between the logarithm of the performance of a linear relationship, that the percentage of sand flow and sediment yield increased exponentially with height decreasing. 10cm high, the sediment accounted for observation height (40cm), total sediment volume of 80%

95%, 20cm height within the sediment accounted for more than 98% of the total sediment volume.



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