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历史干旱
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  historical drought
     THE CHANGES OF PRESENT PRECIPITATION AND HISTORICAL DROUGHT FREQUENCY IN ARID AND SEMI-ARID REGIONS OF CHINA
     我国干旱半干旱地区现代降水量和历史干旱频率的变化
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  “历史干旱”译为未确定词的双语例句
     Finally the results from the application of runs theory to Yellow River historial drought events reappear characters show that return period of annual drought event taking place in middle reach and lower reach of the Yellow River at the same time is 5 78 years, return period exceeding one year is 7 76 years, and exceeding three years is 110 years etc.
     将理论方法应用于黄河流域历史干旱重演特性的研究,结果表明:黄河中下游同步发生年干旱现象的重现期为5.78年,连续1年以上发生的重现期为7.76年,连续3年以上出现的重现期为110年左右。
短句来源
     A great lot of simulated annual precipitation series can be generated as regional drought indexes by using the model,and then the frequency analysis of regional drought characteristic quantities can be done,the return periods of regional history drought events can be identified.
     该模型可用于生成大量的年降雨量模拟序列作为地区干旱指标序列,从而可对所研究地区干旱特征量的频率特性进行估计,对已发生的历史干旱事件的重现期进行识别。 图2,表2,参8。
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  相似匹配句对
     Discussion on history extraordinary drought in Guanzhong region
     关中地区历史特大干旱探讨
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     THE HISTORY OF SINO-HIMALAYAN BAMBOO FLOWERING. DROUGHTS AND SUN-SPOTS
     中国喜马拉雅竹子开花、干旱和太阳黑子的历史
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     A History of Pi
     π的历史
短句来源
     A History of Metallurgy
     冶金学历史
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     COMMENT ON THE DEFINITION OF DROUGHT
     干旱定义述评
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  historical drought
Reconstruction of the rainfall in rainy season based on historical drought/ flood grades
      
Historical drought and water disasters in the Weihe Plain
      
Moreover, the most prominent periodicity of the historical drought time series was that of ~40?years.
      
Comparing natural terrestrial and solar phenomena, we found that the most sustained and strongest modulation of historical drought occurrence is at ~60-64?years and is between the historical drought series and the solar proxy Be10.
      
In this paper, based on historical drought recurrences in the region, a model of aridity quantification and climatic scenario for the period 2000-2030 is described.
      
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The characteristics of historical drought disasters,flood catastrophes and earthquake disasters and their relationships in Shandong province have been studied in detail in this paper.It is found that there exists quasi-periodic active characteristics in varied time scales in drought disasters,flood catastrophes and earthquake disasters.For example,most of the strong continental earthquakes and droughts occur in succession,while most of marine earthquakes break out in the flooding period;catastrophic earthquakes...

The characteristics of historical drought disasters,flood catastrophes and earthquake disasters and their relationships in Shandong province have been studied in detail in this paper.It is found that there exists quasi-periodic active characteristics in varied time scales in drought disasters,flood catastrophes and earthquake disasters.For example,most of the strong continental earthquakes and droughts occur in succession,while most of marine earthquakes break out in the flooding period;catastrophic earthquakes usually generated before a drought and succeeded by a flood,furthermore,a preliminary substage of the drought activities in Shandong province is achieved, which has very immportant practical significance for disaster prediction,protection and alleviation.Finally,the genetic interpretation about the phenomenon mentioned here is given.

分析了山东地区历史干旱、洪涝和地震灾害时间分布特征及其相互关系,发现旱涝与地震灾害一样具有不同时间尺度的准周期活动特征,且地震与旱涝具有一定相关关系.如内陆大地震多与干旱活动相继发生,海域地震多发生在洪涝活动时期;破坏性地震前多发生干旱,震后又常有洪涝相随等。进而对山东旱涝活动进行了初步分期。文中还对上述现象的成因作了简单分析。

Firstly, based on the theory of runs distribution in one dimensional random process, the theory of run distributions in multi dimensional random processes is presented in this paper. Here, random processes are classified in four types: (1)Processes are independent on spatial and temporal scales; (2)Processes are independent on spatial scale and correlated on temporal scale; (3)Processes are correlated on spatial scale and independent on temporal...

Firstly, based on the theory of runs distribution in one dimensional random process, the theory of run distributions in multi dimensional random processes is presented in this paper. Here, random processes are classified in four types: (1)Processes are independent on spatial and temporal scales; (2)Processes are independent on spatial scale and correlated on temporal scale; (3)Processes are correlated on spatial scale and independent on temporal scale; (4)Processes are correlated both on spatial and temporal scales. Secondly, the statistic method is used to test the accuraucy of developed runs theory. Finally the results from the application of runs theory to Yellow River historial drought events reappear characters show that return period of annual drought event taking place in middle reach and lower reach of the Yellow River at the same time is 5 78 years, return period exceeding one year is 7 76 years, and exceeding three years is 110 years etc.

在一元平稳随机过程游程理论的基础上,提出了多元平稳随机过程游程分析方法,并推导出一系列计算公式。多元平稳随机过程可以划分为四种类型,即:空间和时间均独立的多元平稳随机过程;空间独立,时间相依的多元平稳随机过程;空间相依,时间独立的多元平稳随机过程;空间和时间均相依的多元平稳随机过程。采用统计试验法验证了公式的正确性。将理论方法应用于黄河流域历史干旱重演特性的研究,结果表明:黄河中下游同步发生年干旱现象的重现期为5.78年,连续1年以上发生的重现期为7.76年,连续3年以上出现的重现期为110年左右。

Frequency analysis of regional drought characteristic quantities such as drought duration and degree is an important element in regional water security management.Currently,its applicable analysis method is primarily stochastic simulation,and the key problem in the simulation is to build a suitable stochastic model of precipitation process.Under consideration of the observed precipitation series containing much important information such as the temporal and regional characteristic of precipitation,this paper...

Frequency analysis of regional drought characteristic quantities such as drought duration and degree is an important element in regional water security management.Currently,its applicable analysis method is primarily stochastic simulation,and the key problem in the simulation is to build a suitable stochastic model of precipitation process.Under consideration of the observed precipitation series containing much important information such as the temporal and regional characteristic of precipitation,this paper deals with statistical characteristic of the annual precipitation probabilistic process using the stochastic analysis theories and the technique of computer numerical simulation.A stochastic model named first order autoregressive model with Pearson Type Ⅲ distribution was proposed for the practical use.The diagnostic test of the model has been passed.The calculating results show that the model designed is quite satisfactory.A great lot of simulated annual precipitation series can be generated as regional drought indexes by using the model,and then the frequency analysis of regional drought characteristic quantities can be done,the return periods of regional history drought events can be identified.

地区干旱历时和干旱程度等特征量的频率特性分析是区域水安全管理的重要基础工作,目前适用的分析方法主要是随机模拟技术,其中的关键问题是建立合适的降雨过程随机模型。考虑到实测降雨序列本身就包含有降雨的地区特性、连续时段雨量的变化特性等重要信息,以随机分析原理和计算机数值模拟为基础,对年降雨量过程进行统计特性分析,建立了面向实用性的P-Ⅲ型分布AR(1)模型并通过了检验。应用结果表明,所建立的模型较为满意。该模型可用于生成大量的年降雨量模拟序列作为地区干旱指标序列,从而可对所研究地区干旱特征量的频率特性进行估计,对已发生的历史干旱事件的重现期进行识别。图2,表2,参8。

 
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