1) structure of wind-sand flow
风沙流结构
1.
Field measurements of influence of total sand transport rate on the structure of wind-sand flow on the coastal transverse ridge
风速对海岸沙丘表面风沙流结构影响的实证研究
2.
Here,he structure of wind-sand flow on the top of coastal transverse ridge was measured by use of field vertical anemometer and sand trap.
选择中国规模最大、形态最为典型的河北昌黎黄金海岸的横向沙脊,采用野外梯度风速仪和平口式积沙仪对其顶部的风沙流结构进行了观测。
3.
Through field investigation on wind speed,aerodynamic roughness,rate of sand transportation,and structure of wind-sand flow on different underlying surfaces,we found that vegetation cover can effectively prevent soil erosion by wind.
通过对毛乌素沙地不同下垫面上风速、地表粗糙度、临界起沙风速、风沙流结构的观测,发现植被覆盖可以有效防止地表风蚀。
3) blown-sand structure
风沙流结构
1.
Experiments are designed against road embankments,soil-excavated fields and sidewalks of Zhangji railway,in order to analyze the relation between the wind speed and sand transport flux,blown-sand structure and sand transport movement.
通过选取张集铁路,进行路堤、取土场和便道试验,对其输沙率和风速关系、风沙流结构和风蚀运动规律进行分析。
2.
Through field observation of blown-sand movement at semi-arid sandy region in spring,it studied the change of sand transport rate and blown-sand structure at the height of 0～60 cm with increasing field length on field surface after moldboard plowing,harrowing and milling respectively.
通过对春季半干旱沙区农田风沙活动的观测,本文对犁耕、耙磨磨平两种处理下近地表0~60 cm内输沙率和风沙流结构随田块长度的变化规律进行了研究。
4) wind structure
风流结构
1.
Analysing wind structure of ventilator duct exit;
通风机管道出口处风流结构分析
5) fragmental texture
沙丘沙结构
6) wind-blown sand
风沙流
1.
Stochastic sand trajectories in wind-blown sand were obtained by solving the differential equation which describes the vertical fluctuating velocity of sand grains.
通过对描述沙粒垂向运动速度脉动分量的随机微分方程的直接求解,获得了风沙流中沙粒运动的随机轨迹。
2.
Through simulations on abated effect of nylon and plastic nets with different structure on wind-blown sand in wind tunnel, the aim of this paper is to provide a theoretic base for optimized design of blown sand engineering in the field and a new sand-defending material application.
通过不同结构的尼龙网和塑料网对风沙流减弱作用的风洞实验研究,旨在为探求各种防沙新材料的防护功能,并为防沙新材料的开发、野外工程防沙的优化设计及其应用提供理论依据。
3.
Though simulations on abated effect of nylon net with different porosities on wind-blown sand in wind tunnel, the aim of this paper is to research the relationship between sand transporting and nylon net porosity and wind velocity.
通过对不同孔隙度尼龙网对风沙流减弱作用的风洞模拟实验,旨在探求输沙量与孔隙度和风速二者之间的关系,从而为防沙新材料的开发、野外工程防沙的优化设计及其应用提供理论依据。
补充资料：风沙流
| 风沙流 wind-drift sand 风成沙在风力作用下的移动现象。风携带各种不同粒径的沙粒，使其发生不同形式和不同距离的位移称风的搬运作用 。当近地面的风速大于每秒4米时，0.1～0.25毫米粒径的沙粒就能被搬运形成风沙流。通常，被风吹扬的沙粒的颗粒大小和风速成正比。风沙流中的含沙量与高度有关。据观察，风沙流中的绝大部分沙粒都在近地表10厘米以下，并随着风速的增大而增多。风沙粒的运动方式有3种：①＜0.2毫米的沙粒在风速每秒5米时，呈悬浮状态移动称悬移。②气流中飞跃的颗粒，降落时碰撞地面而产生的回弹称跃移。③跃移颗粒对地面较大颗粒冲击后，缓缓向前移动称蠕移。 |
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条