lunate bar

Field measurement of surface wind velocity and sediment transport rates was made on barchan dune in Wulanbuhe desert to understand.

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。

Field observation and theoretical analysis of wind velocity on windward slope of a isolated barchan dune indicated that velocity profile is non logarithmic; shear velocity and sand transport increase from foot of slope to the top as a whole though change correspondently with increase or decrease of the slope gradient.

对孤立新月形沙丘迎风坡风速的野外实测和计算表明，沙丘迎风坡表面风速廓线呈非对数关系，近地面剪切风速和输沙强度由坡脚至丘顶总体呈递增趋势，但同时随断面坡度的增减而发生相应的变化；沿断面输沙率的变化导致蚀积强度的改变，表现为沙丘迎风坡坡度变缓的部位沉积大于侵蚀，其它部位侵蚀大于沉积，其中丘顶输沙率和侵蚀强度最大。

Retrograde Evolution of Barchan on Interdune Corridor of Complex Ridges in Central Taklimakan Desert;

塔克拉玛干沙漠腹地复合沙垄间地新月形沙丘的逆向演变

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。

At Changli Gold Coast,42 samples of particle size were col- lected on a coastal barchan,which was a typical coastal barchan chosen from all the barchans in this re- search region.

结果表明,昌黎黄金海岸新月形沙丘两翼、迎风坡脚、迎风坡、沙丘顶部、背风坡、背风坡脚的粒度总体上是中砂、分选好、偏度近对称和中等峰态,只有平均粒径在新月形沙丘表面的不同部位存在一定的差异,自迎风坡脚到沙丘顶部粒径变粗,背风坡粒径相对变细,到背风坡脚粒径又变粗,整个沙丘表面粒径顶部最粗、背风坡最细,其分布可以归入沙丘顶部砂物质最粗的分布模式。

Retrograde Evolution of Barchan on Interdune Corridor of Complex Ridges in Central Taklimakan Desert

塔克拉玛干沙漠腹地复合沙垄间地新月形沙丘的逆向演变

The effects on the morphology and advance of isolated barchans on interdune corridor of complex ridges in the central Taklimakan Desert;

草方格固沙带对垄间新月形沙丘形态和移动的影响

Researchers hope that the sandhill cranes will return to Wisconsin on their own in February or March.

研究人员希望这些沙丘鹤在二月或三月能够独立飞回威斯康新州。

A hill or ridge of wind-blown sand.

沙丘风吹沙子形成的小山

RESEARCH ON ON AEOLIAN SAND CHARACTERISTICS AND DEPOSITIONAL STRUCTURE OF LINGAR DUNES

线形沙丘的风沙沉积特征与内部构造

dene:a sandy tract or dune by the seashore.

沙丘:海边的沙地或沙丘.

A sandy tract or dune by the seashore.

沙丘海边的沙地或沙丘

Shaped like a crescent.

新月形的象新月形状的

The old man silently looked around at the sand-hills.

老沙头不说话，环视着沙丘，仔细辩认着地形。

The little dune is formed with loose dry sand by wind.

这个小沙丘是由风吹来的干沙子形成的。

Morphologic parameters of the simple transverse dunes in Taklimakan Desert

塔克拉玛干沙漠简单横向沙丘形态学示量特征

Morphologic parameters of“featherlike longitudinal ridge”of Kumtag Desert;

库姆塔格沙漠“羽毛状沙丘”形态的示量特征

Morphological and migration characteristics of large-scaled submarine,coastal and desert sand dunes

大型海底、海岸和沙漠沙丘的形态和迁移特征

Cute Jim sat on the dune eating a prune in June.

可爱的吉姆在六月天坐在沙丘上吃着话梅。

Sandhill cranes lay their eggs in the northern state of Wisconsin.

沙丘鹤在威斯康新州北部产卵，

In sandy places you can often see heaps of sand forming little hills.

在多沙的地方，你会经常看到一堆堆的沙形成的小山，它们叫作“沙丘”。

Fractal features of dunes over the high longitudiral complex ridges in the hinterland of the Taklimakan Desert

塔克拉玛干沙漠腹地高大复杂纵向沙垄区沙丘分形特征

Saudi Red Crescent Society

沙特阿拉伯红新月会