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下游
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  lower reaches
    AN ANALYSIS OF ABNORMAL PRECIPITATION DURING PLUM RAINS SEASON IN THE LOWER REACHES OF THE YANTZE REGION IN 815 YEARS (1163-1977)
    1163—1977年(815年)长江下游地区梅雨活动期间旱涝规律初步分析
短句来源
    The rainfall variation in the Northern China, the mid- and lower reaches of Changjiang River and the Southern China appears 1.2.3, and 3.4 years oscillation respectively.
    (3)我国华北、长江中、下游和华南地区降水分别存在1、2.3和3.4年的周期。
短句来源
    The precipitation equation is δD=7.54δ\+\{18\}O+15.92, showing a characteristic of intense vaporization in the Middle\|Lower reaches of the Yarlung Zangbo River.
    雅鲁藏布江中、下游地区的雨水方程为 :δD =7.54δ18O +1 5.92 ,表现出该地区为强烈蒸发特征。
短句来源
    The results show that the changes of phenological seasons in the lower reaches of Shiyang river are coincide with the seasonal evolution of climate. The temperatures of phenological seasons are ≥2.9℃in spring,≥19.0℃in summer,<19.0℃in autumn and ≤4.5℃in winter.
    结果表明,石羊河下游物候季节的更迭与气候的季节性演变相吻合,稳定通过物候四季的温度界限分别为春季≥2.9℃,夏季≥19.0℃,秋季<19.0℃,冬季≤4.5℃。
短句来源
    Analyzing the Effect of Solar and Volcanic Activities on Temperature Variations in the Guliya Ice core Record and in the Lower Reaches of the Yangtze River over the Last Three Centuries
    近300a来古里雅与长江下游温度变化所受太阳活动、火山活动的影响分析
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    Causation Analyses of High Water Level in the East Part of the Yangtze River and Its Services of Forecasting Decisions
    长江下游东段高水位的天气类型及预报服务决策
短句来源
    The evaporation appears the cycles of 6.7、4.4 and 3.3 year.
    博尔塔拉河下游最大商潽分析存在20a、6.7a、3.1a的显著周期;
短句来源
    According to the analysis of 13 years data, it is shown that there are close relations between the ridge and center positions of Qinghai-Xizang high pressure on 100mb surface and the large scale distribution of floods and droughts in East China in summer.
    通过分析13年资料后,指出夏季100毫巴青藏高压脊线及高压中心的位置与我国东部大范围旱涝分布的关系密切。 1.夏季100毫巴青藏高压脊线的位置,尤其是120°E处脊线位置,与长江中、下游梅雨期及伏旱期有密切的关系,梅雨期120°E脊线位于26°—32°N之间,伏旱期在33°N以北。
短句来源
    The results show that the first five major spatial patterns from theprincipal component analysis respond to the influence of different monsoon systems,re-spectively,and time coefficients have the remarkable periods of 12—22,28—31,43—65days.
    结果表明,主成份分析得到的前5个特征向量的空间分布与各个季风系统的活动有关,其时间系数存在显著的12—22天准周期振荡和28—31,43—65天的低频振荡周期,它们与长江下游暴雨形成有密切联系。
短句来源
    Some Aspects of the Distribution of giant hygroscopic Nuclei over the Region of the lower Yangtze in Summer.
    夏季长江下游地区吸湿性巨核的分布特点
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  lower reaches
As supersonic speed at upper reaches and subsonic speed at lower reaches in a duct, the position of shock layer is analyzed and the asymptotic estimation of solution, is obtained.
      
The sap flow of the sampled Populus euphratica stems at different radial depths and directions had been studied in Ejina Oasis, in the lower reaches of the Heihe River.
      
Dynamic fate modeling of γ-hexachlorocyclohexane in the lower reaches of the Liao River
      
This model is used to simulate the fate of γ-hexachlorocyclohexane (γ-HCH) in the lower reaches of the Liao River from 1998 to 2008.
      
The data obtained with the trypsin-azocasein and α-amylase-modified starch tests indicates pollution of water and surface sediments in the lower reaches of Volga and the inflow sea regions.
      
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In this paper, the instability, phase velocity and group velocity of the gravitational waves in a geostrophic currents are analysed by using a two layer model. The conclusions reached are that: 1. When the Froude number is greater than unit, the gravitational waves of some wave lengths will become unstable. This instability may be used to explain the development of some meso-scale systems. 2. The group velocity of the gravitational waves can exceed its phase velocity. Therefore, when a meso-scale system is developed...

In this paper, the instability, phase velocity and group velocity of the gravitational waves in a geostrophic currents are analysed by using a two layer model. The conclusions reached are that: 1. When the Froude number is greater than unit, the gravitational waves of some wave lengths will become unstable. This instability may be used to explain the development of some meso-scale systems. 2. The group velocity of the gravitational waves can exceed its phase velocity. Therefore, when a meso-scale system is developed in some regions, its energy can travel faster downwind than the phase velocity, therefore a new wave may be formed in the front of the old one.

本文用一个一维线性的二层模式,分析了地转气流中重力惯性内波的动力学性质。讨论了重力惯性内波的不稳定性、相速度和群速度后,指出: 1)当地转风速大于重力内波波速时,某些尺度的重力惯性内波可以产生不稳定性,这种不稳定性可以用来解释某些中系统的发展。 2)某些波长的重力惯性内波,它的群速度可以大于相速度;因此在某一地区有中系统发展时,它的能量可以很快地传到下游,而在某下游产生新的系统。

In this paper the results of the measurements of giant hygroscopic nuclei sampled in a series of flights over the region of the lower Yangtze during the periods of the August 1963 are presented. These measurements of the size and concentration of giant nuclei were carried out by the "isopie- stic" method. It is found that the distribution of giant particles over aforesaid region has some important characteristics: (1) The horizontal distribution of the particle concentration is not uniform. Occasionally, it...

In this paper the results of the measurements of giant hygroscopic nuclei sampled in a series of flights over the region of the lower Yangtze during the periods of the August 1963 are presented. These measurements of the size and concentration of giant nuclei were carried out by the "isopie- stic" method. It is found that the distribution of giant particles over aforesaid region has some important characteristics: (1) The horizontal distribution of the particle concentration is not uniform. Occasionally, it varies serval times within a range about 6--8 km. (2) The concentration of giant nuclei captu- red at the level of 1000m below which easterly current exists decreases inland with increasing distance from the coast, and because of the existence of the predominating western flow component, the concentration of gaint nuclei captured at the level of 1280m decreases unmarkedly. On the contrary, the concentration of giant nuclei increases far inland from the coast. (3) There are two maxima values of the concentration of giant nuclei in vertical distri- bution: One is situated at the transitional level of wind, and the other at the level of 3000--3600m above the ground. However, the concentration of larger nuclei of γ≥2μ decreases with height very slowly. (4) The concent- ration of the larger nuclei with radii γ≥2μ is nearly consistents with that of the large cloud-drops of γ≥50μ in cumulus.

本文介绍了1963年8月份长江下游地区吸湿性巨核的飞机观测结果。巨核的大小和浓度测量是用“等压法”进行的。观测表明,上述地区巨核分布具有某些重要特点:(1)巨核浓度的水平分布是不均匀的,在6—8公里范围内浓度可以相差好几倍;(2)在低空偏东气流影响下,巨核由沿海向内陆减少。而在1280米高度上,由於偏西气流存在,巨核向内陆减少不明显;在寓海岸较远的地方,巨核浓度反有向内陆增加的趋势;(3)巨核浓度的垂直分布有两个极大值,一个位於风的转换高度,另一个位於3000—3600米,而特大巨核随高度减少得十分缓慢;(4)特大巨核(γ≥2μ)浓度与积云中大云滴(γ≥50μ)的浓度是相当的。

The wetness data at 100 stations were carefully examined by means of spectrum analysis. A pronounced spectral peak in the 36-yr. was observed in the data for Shanghai and the adjacent region. The geographical distribution of relative spectral power for sea-level pressure at different grid points in Northern and Southern Hemispheres showed a stronger peak in 36-yr. at central Pacific Ocean. This 36-yr. peak for general circulation was found to be closely related with the wetness of China. The South Oscillation's...

The wetness data at 100 stations were carefully examined by means of spectrum analysis. A pronounced spectral peak in the 36-yr. was observed in the data for Shanghai and the adjacent region. The geographical distribution of relative spectral power for sea-level pressure at different grid points in Northern and Southern Hemispheres showed a stronger peak in 36-yr. at central Pacific Ocean. This 36-yr. peak for general circulation was found to be closely related with the wetness of China. The South Oscillation's index were obtained from pressure differences between grid points 160°W, 10°N and 140°E, 20°S. A clearly 36-yr. oscillation was also revealed in the long-period variation of S.O. index. The mechanism of the 36-yr. oscillation was discussed.

本文分析了近五百年旱涝资料,发现我国东部存在36年左右的周期,长江下游地区尤其明显。进一步研究了近百年大气环流的多年变化,发现赤道中太平洋地区36年周期最突出,并且与旱涝的周期变化有密切关系。利用近期的海温资料及以前不同作者的研究结果,我们提出了一个旱涝36年周期变化机制的模式:当赤道中太平洋海面温度偏低时,相应赤道中太平洋海乎面气压偏高,澳洲附近气压偏低,对应南方涛动指数偏强,沃克环流强,哈得来环流东弱西强,北半球太平洋副热带高压东弱西强且西伸、位置偏南,我国长江下游地区偏涝;反之则偏旱。

 
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