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新月形沙丘

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0M/s.(4) The barchans dunes developed in narrow un-modal wind regime, the value of RDP/DP is greater than 0.8; the compound longitudinal dunes mainly developed in modal wind regime whose value of RDP/DP is about 0.55; the dome dunes developed in those areas that have directional winds and their force is balanced; and the star dunes mainly distributed in areas which have wavy terrain or approach mountains.

4塔克拉玛干沙漠新月形沙丘及沙丘链主要是在窄单峰风环境中发育而成,RDP/DP值一般都在0.8以上;复合型纵向沙垄主要是在双峰风况条件下发育而成的,RDP/DP值在0.55左右:穹状沙丘形成于均衡的多风向地区;而金字塔沙丘一般都形成于下伏地面微有起伏或邻近山岭的地带。

The barchans dunes developed in narrow un-modal wind regime, the value of RDP/DP is greater than 0.8; the compound longitudinal dunes mainly developed in modal wind regime whose value of RDP/DP is about 0.55; the dome dunes developed in those areas that have directional winds and their force is balanced; and the star dunes mainly distributed in areas which have wavy terrain or approach mountains.

塔克拉玛干沙漠新月形沙丘及沙丘链主要是在窄单峰风环境中发育而成,RDP/DP值一般都在0.8以上;复合型纵向沙垄主要是在双峰风况条件下发育而成的,RDP/DP值在0.55左右;穹状沙丘形成于均衡的多风向地区;而金字塔沙丘一般都形成于下伏地面微有起伏或邻近山岭的地带。

A large barchan (crescent-shaped) dune, in a region where some dunes have been observed shrinking over several years.

大型新月形沙丘在一个地区,那里的一些沙丘已经观察几年缩小。

Another kind of dunes are barchan dunes.

另一种是新月形沙丘类型沙丘。

Parabolic dunes are the opposite of barchan dunes.

抛物型沙丘是新月形沙丘相反。

The width effects of dune are studied and the reason that the barchan dune is formed on the lee slope of dune is given.

但对于背风坡形状的形成,特别是对新月形沙丘,这样一种沙漠、戈壁上最常见的相对稳定的横向沙丘的背风坡新月形落沙坡的形成和保持,无有完整的理论分析,只是简单地认为其坡度不能大于沙子的摩擦角而已。

Patterns in Nature: Sand Strange creatures slithering up from the Empty Quarter desert floor in the Arabian Peninsula are really a network of barchan dunes—sculpted by winds that over time strike the sand from a consistent direction.

位于阿拉伯半岛一种奇怪的不稳定的滑动来自Empty Quarter沙漠是真正的网络的新月形沙丘――造型被风吹的长期打击沙丘来自一致的方向。

Barchan ; windward flank ; wind speed\|up simulation ; dune shape

新月形沙丘;迎风坡;加速模拟;沙丘形态

Field measurement of surface wind velocity and sediment transport rates was made on barchan dune in Wulanbuhe desert to understand. The results show that the wind velocities increasing upon windward slopes of the dunes vary with both slope morphology and wind velocity at the foot of the dunes.

对乌兰布和沙漠新月形沙丘表面风速的野外观测结果表明,沙丘迎风坡气流加速量主要和沙丘坡面形态、迎风坡前来流风速有关,迎风坡风速放大率介于1.02~1.59之间。

Velocity speeding\|up on the windward flanks of barchans is a dynamic factor which control dune formation and dune shape.

迎风坡气流加速是决定新月形沙丘发育和形态的动力因子,研究这一加速过程的定量关系有利于认识沙丘的发育、沙丘的形态、沙丘的运动等。

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