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variability of runoff
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  “variability of runoff”译为未确定词的双语例句
     A Tentative Discussion on the Impact of Human Activities on the Variability of Runoff Series of the Beijiang River Basin
     人类活动对北江流域径流系列变化的影响初探
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     The spatial variability of runoff area has a great effect on the time-space input of sediment supply into rivers.
     流域产流面积的空间变化对其产沙、供沙的时空输入特性具有制约作用。
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     Only the TOPMODEL and Xinanjiang model consider the spatial variability of runoff generation.
     只有TOPMODEL和新安江模型考虑了产流空间差异性问题.
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  相似匹配句对
     and the third is variability.
     三、等级性。
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     Irregularities in ENSO Variability
     ENSO变率的不规则性
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     RAINFALL VARIABILITY OF CHINA
     我国之雨量变率
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     On the Variability of Literary Language
     论文学语言的变异性
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     Forest and Slope-runoff
     森林对坡面产流的影响研究
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  variability of runoff
Increases in spatial variability of runoff reflect the basin's complex physiographic characteristics.
      
A relatively small fraction of glaciers in a drainage basin significantly lowers the annual variability of runoff.
      


The Yongjiang River is a micro-tidal alluvia] stream, but its upstream tridutaries mainly run through mountainous and hilly regions. The configuration and size of this river are relatively stable for a long tirne. A tidal barrier was built on the Yongjiang River, in 1959. As a result, the sedimentation was so serious that up to 1973, 3108 × 1104m3 of sediment had been accumulated in the Yongjiang river bed.In this paper, the basic characteristics of hydrodynamic action, sediment transportation and alluvial processes...

The Yongjiang River is a micro-tidal alluvia] stream, but its upstream tridutaries mainly run through mountainous and hilly regions. The configuration and size of this river are relatively stable for a long tirne. A tidal barrier was built on the Yongjiang River, in 1959. As a result, the sedimentation was so serious that up to 1973, 3108 × 1104m3 of sediment had been accumulated in the Yongjiang river bed.In this paper, the basic characteristics of hydrodynamic action, sediment transportation and alluvial processes of the Yongjiang River have been dis-cussed. Based on the above analysis, a preliminary approach to the principles and measures of the regulation for the Yongjiang channel is made. The contents of this paper may be summarized as follows;In view of the small tidal range, larger variability of runoff and the ratio between the average flood flow and annual mean runoff volumes that is more than 12, the Yongjiang River, therefore, should be considered as a mountainous micro-tidal river. The tidal action is the main dynamics to fluvial processes. The boundary and bed of the Yongjiang River is composed of fine sediment which mainly derived from sea area.The fine materials are transported as suspended load.The general trend of sediment transportation and sedimentation may he described as follows; During flood seasons, owing to the effects of the ebb currents strengthened by the runoff, the sediment is carried and then silted downstream from the upstream reacn. on the contrary, the sediment is carried and then silted upstream from the downstream reach and out of the river mouth in non-flood seasons.The Yougjiang River is a meandering stream. The serious siltation of it should be attributed to the tremendous decrease of tidal discharge. After the construction of the tidal barrier and the training dikes, the processes of river bed are governed by the laws of siltation in the channel below the barrage, and in the curved mouth reach bifurcated channels has been cut.By dint of the above discussion, the principles of the regulation for the Yongjiang channel should be.1. Multi-purpose utilization of water resources.2. Keeping up pattern of meandering stream.3. Unchanged tidal inflow of the estuary.4. Combining regulation with dredging.5. Regulated elevation of middle tidal stage.In order to reduce the siltation, the following measures of regulation should be adopted.1. Operating the gate of the barrier and enlarging tidal prism.2. Enclosing and fixing tidal beaches.3. Extending the training dike and narrowing the river width.

本文分析甬江动力、泥沙、边界及河床演变的基本特征,提出甬江航道整治的原则和措施。

The isotopic composition(T,18O)of rainfall and various runoff components including interflow from unsaturated zone and grouadwater flow from saturated zone was monitored during the rainfall events of 1986-1989 in a special designed experimental catchment with all the runoff components are measurable. The contribution of preveni-ent water (old water) to surface runoff is identified and the portion of old water ranged from 0% to 50.5% is estimated. It implies that the current concept which considers surface runoff...

The isotopic composition(T,18O)of rainfall and various runoff components including interflow from unsaturated zone and grouadwater flow from saturated zone was monitored during the rainfall events of 1986-1989 in a special designed experimental catchment with all the runoff components are measurable. The contribution of preveni-ent water (old water) to surface runoff is identified and the portion of old water ranged from 0% to 50.5% is estimated. It implies that the current concept which considers surface runoff is always orginated from event rainfall is very likely a misconception. The different contributions of old water in interflow and groundwater flow are identified and estimated, too. The existance of temporal isotopic variability of runoff components during rainfall events demonstrates the temporal variations of old water composition in these components. For the four patterns of hydrograph with different combinations of runoff components, different compositions of old water are found ranged from 0% to 77%. As a comparison, several natural basins were sampled. From these results, it is shown that the current method of hydrograph separation up to now used widely in this country is, unrealistic in generally. These results also pose questions about the concepts related to rainfall-runoff relationships and to the UH analyses.

利用环境同位素氚和氧-18对实验集水区进行降雨和径流响应的研究表明:(1)地面径流必源于本次降雨的概念不确,其中往往有非本次降雨的水量。经对1986年~1989年各次降雨估算表明,非本次降雨贡献最高可达50.5%。(2)非饱和带壤中流和饱和带地下水径流中必有非本次降雨的水量,并与地面径流一样,在次降雨径流过程中有时程变化。(3)对不同径流组成的流量过程,非本次降雨所占的比重不同。通过分析,可知降雨径流相关关系中的一一对应假定不确切,认为:传统的降雨径流经验关系和单位线概念需重新考虑;传统的过程线经验划分方法和现行同位素划分方法的有关基本假定不完全符合实际.

Abstract Suspended sediment transport in streams is strongly relative to runoff generation and sediment yield,affected by vegetation, soil, geology, land use and man's activities in catchments. The spatial variability of runoff area has a great effect on the time-space input of sediment supply into rivers. different reaches,variation of stream hydraulic geometry and the unsteady movement of flood wave have direct impact on the sediment transport. The basic experiential form of sediment rating curve is...

Abstract Suspended sediment transport in streams is strongly relative to runoff generation and sediment yield,affected by vegetation, soil, geology, land use and man's activities in catchments. The spatial variability of runoff area has a great effect on the time-space input of sediment supply into rivers. different reaches,variation of stream hydraulic geometry and the unsteady movement of flood wave have direct impact on the sediment transport. The basic experiential form of sediment rating curve is Qg=aQsb, its accuracy of modelling and forecasting is limited because of the influence of climatical environment, local environment and seasonal change. It is necessary to consider multielement and use distributed models to study and improve the accuracy of rating curve modelling.Abstract

河道输沙同流域的产流、产沙特性紧密相联.受流域内植被、土壤、地质、土地利用状况及人类活动等因素的影响。流域产流面积的空间变化对其产沙、供沙的时空输入特性具有制约作用。不同的河段位置.河道的水力几何形态,非恒定的洪水波运动将直接影响到河道的输沙特性。水沙关系的基本经验模式为:Qg=AQsb受其气候环境、区域环境及季节变化的影响,模拟及预报的精度受到限制。需从多因素、分散型模型应用的角度考虑加以改进。

 
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