查询词典 saltating

The lift-off angle of saltating sand grain follows LogNorm4 function distribution; lift-off horizontal velocity, vertical velocity and resultant velocity of saltating sand grain and falling angle and vertical velocity of saltating sand grain follow Gamma function distribution; falling horizontal velocity and resultant velocity of saltating sand grain follow Pearson IV function distribution.

跃移沙粒起跳、降落速度分布函数利用风洞实验获得的沙粒跃移运动的片断轨迹，反推出沙粒起跳角度服从LogNorm4函数分布，跃移沙粒起跳水平、垂直及合成速度均服从Gamma函数分布。

It is suggested that the wind shear velocity with a saltating cloud reflects the response of airflow to the ground surface and the saltation layer.

根据数值模拟和模拟实验，我们认为有风沙运动的动床剪切风速是综合反映风场与跃移层以及地表之间相互作用的物理量。

Third, using numerical method, saltating trajectory of sand particle has been obtained.

结果表明，阻力最重要，重力次之，升力也不可忽略，它占重力的20％以上。

Finally, the thesis analyzes statistical laws of the maximum saltating height and saltating length of saltating sand grains and they follow Gamma function distribution. This is consistent with the results of water-sand motion. It shows that statistical laws of saltating height and saltating length of saltating sand grains are independent of the medium of flow. It is possible the nature of saltating sand grains.

最后，分析了沙粒跃移距离、跃移高度的相对量的统计规律，认为它们均服从Gamma函数分布，与在含沙水流中的研究结果一致，说明沙粒跃移运动的跃移高度与跃移距离的统计规律与流场、所处的介质无关，这可能是沙粒跃移运动的本质所在。

This paper develops the mathematical models of the wind-sand interaction, taking the saltating cloud as fluidized flow. The force exerting on the airflow by saltating particles is expressed in terms of the drag coefficient of the fluidized particle flow.

本文将跃移风沙流视为一种颗粒拟流体，将跃移颗粒对气流产生的阻力用颗粒流的阻力系数来表达，建立了描写两场相互作用的数学模型。

The results show that saltating snow particles have important effects on wind velocities near surface and Magnus lifting force also has effects on the wind profiles as well as saltating trajectories of snow particles.

计算结果表明，跃移雪粒对贴地风速有重要影响，Magnus效应对贴地风速、雪粒跃移轨迹也有显著影响

The saltation boundary layer is divided into an inner boundary layer in which the saltating particles exert significant force on the airflow, and an outer boundary layer in which saltating particles exert insignificant force on the airflow, but the out layer is affected by the inner boundary layer.

将风沙边界层划分为跃移颗粒所产生的阻力不可忽略的内边界层和跃移颗粒阻力可以忽略但受内边界层影响的外边界层，分别建立了内边界层和外边界层的风速廓线表达式。

Parameters of movement process of saltating sand grains The thesis studies some motion parameters of saltating sand grains by using wind tunnel experiment and computer simulation.

沙粒跃移运动参数利用风洞实验与计算机数值模拟技术，研究了跃移沙粒运动参数。

It would also help to obtain integrity trajectories of saltating sand grains by extending bitty saltating trajectories grained from wind tunnel experiment in order to understand deep sand grain saltating motion.

这项研究为跃移沙粒运动参数分布函数研究提供了一条新思路，有助于将风洞实验获得的沙粒跃移运动的片断轨迹拓展，进而获得沙粒跃移运动的整个轨迹，以便深入理解沙粒跃移运动。

The number of lift-off sand grains percent time percent sand bed area Based on the lift-off velocity distribution function of saltating sand grain, this thesis gains the number of lift-off sand grains percent time percent sand bed area which ranges from 6796 to 8846900 number/(s·m2) by combination motion model of single saltating sand grain and some motion parameters of saltating sand grains and the flux of wind sand current from wind tunnel experiment.

单位时间单位面积沙床起跳沙粒数利用本文获得的沙粒起跳初速度分布函数，结合沙粒跃移运动学模型以及风洞实验中获得的沙粒跃移运动参数以及输沙量，反演出一定风场条件下单位时间单位面积沙床起跳沙粒数，变化范围6796-8846900个/(s·m2)，并满足。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失