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middle reaches
相关语句
  中游
     On the basis of comprehensive analysis on present achievements of water reduction by artificial afforestation and environment conservation regionalization of upper and middle reaches in Yellow River,water reduction norms of artificial afforestation of regions are calculated,which are 93.82 m~3/hm~2 in loess hilly region,58.54 m~3/hm~2 in Loess Plateau and hilly region and 168.87 m~3/hm~2 in earth-rocky mountainous region respectively.
     在综合分析了人工造林减水作用现有主要研究成果,对黄河上中游进行生态环境建设分区的基础上,求算了各分区人工造林减水定额,黄土丘陵沟壑区为93.82 m3/hm2、黄土高塬沟壑区为58.54 m3/hm2、土石山区为168.87 m3/hm2。
短句来源
     According to the research that under the conditions of the designed standard of rainstorm (24 hours) frequency in the middle reaches of the Yellow River as 1%~0.5%, when the total area of dammed land reaches to 1/20 ~ 1/10 of the total controlled area of the basin, a dam system can be relatively stable.
     据研究 ,黄河中游在暴雨 (2 4h)频率设计标准为 1%~ 0 5 %的条件下 ,坝地总面积达到坝控流域面积的 1/ 2 0~1/ 10时可达到坝系相对稳定。
短句来源
     Simulation results show that high levels of column burden of organic carbon aerosols (larger than 16 mg/m2) concentrate in the middle reaches of Yangtse River and southwestern China, and in the most part of China to the south of Yellow River the column burden is over 7 mg/m2, while the isopleth of 4 mg/m2 extends to the inner part of northwestern Pacific Ocean.
     模拟结果表明,有机碳气溶胶柱含量的高值区(大于16 mg/m2)主要集中在长江中游和西南地区,黄河以南的我国大部分地区柱含量超过了7mg/m2,并且4 mg/m2的等值线延伸到了西北太平洋深处.
     (1) The area of the Loess Plateau is 39.1×104 km2 instead of 56×104km2 or 43×106 km2, in which the area of the loess plateau in the middle reaches of the Huanghe River is 31.9×104 km2.(2) The control and exploitation of the Loess Plateau should be combined closely together.
     第一,黄土高原的面积为 39.1×10~4km~2,不是 56×10~4或43×10~4km~2,其中黄河中游黄土高原的面积是 31.9×10~4km~2。
短句来源
     The range of appeared frequency of 438bp band amplified by primer S37 in the five populations was:Yellow River population 85% >Huai River population 65%>Dongting Lake population 55%>Poyang Lake population 40%>Taihu Lake population 20%, which indicated a genetic decline from Yellow River to Huai River, from middle reaches of Yangtze River to its lower reaches;
     S37扩增的438bp在5个群体的出现频率大小为:黄河鳖85%>淮河鳖65%>洞庭湖鳖55%>鄱阳湖鳖40%>太湖鳖20%,呈现出从黄河到淮河到长江、从长江的中游到下游逐步降低的遗传渐变现象;
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  中游地区
     Problems and Countermeasures of Agricultural Development in Middle Reaches of the Yangtze River.
     长江中游地区农业发展的问题与对策
短句来源
     After the second stage of water development and utilization, the available water resources for agriculture irrigation should has some increase besides it firstly meet the need of population, environment and industry of middle reaches area in the coming 50 years.
     结果表明 ,当完成水资源开发利用第二阶段 ,可用水资源在首先保证未来 50 a内流域中游地区人口、环境和工业等部门发展的需水后 ,农业灌溉用水的总量将还有所增加 ,水资源不会成为社会经济发展的制约因素 ,可以使绿洲和农业走可持续发展道路。
短句来源
     In this paper, a continuous heavy rain process, which occurred over the middle reaches of Changjiang River between 18-21, August, 1987, is analysed using Column Maximum Pictures of WSR-81S digital radar data in Wuhan City.
     本文利用武汉WSR-81S数字化雷达的Column Maximum图象产品资料,分析了1987年8月18日至21日发生在长江中游地区的一场连续暴雨过程。
短句来源
     Flood prevention and agricultural modernization in the middle reaches of Changjiag River
     长江中游地区防洪与农业现代化
短句来源
     Rodent community structure of desert-oasis landscape in the middle reaches of the Heihe River
     黑河流域中游地区荒漠—绿洲景观区啮齿动物群落结构
短句来源
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  “middle reaches”译为未确定词的双语例句
     Characterization of Gleyization of Paddy Soils in the Middle Reaches of the Yangtze River
     Characterization of Gleyization of Paddy Soils in the Middle Reaches of the Yangtze River
短句来源
     THE CAUSES AND DEVELOPMENTAL TREND OF DESERTIFICATION IN THE MIDDLE REACHES OF THE YARLUNG ZANGBO RIVER AND ITS TWO TRIBUTARIES IN XIZANG
     THE CAUSES AND DEVELOPMENTAL TREND OF DESERTIFICATION IN THE MIDDLE REACHES OF THE YARLUNG ZANGBO RIVER AND ITS TWO TRIBUTARIES IN XIZANG
短句来源
     Correlation and regessionof plant covering with salt soil and ground water in the middle reaches of Tarim river were analyzed.
     对塔里木河中下游主要的 1 0个植物群系下的土壤盐分、地下水理化特征与群系最大盖度进行了相关分析和回归分析。
短句来源
     In April 2002, 33 species of planktonic crustacea in 26 genera (11 Copepoda and 22 Cladocera) were sampled from 17 sites in the middle and lower reaches of the Hanjiang River, the largest tributary in the middle reaches of the Yangtze River.
     2002年4月,在汉江中下游从丹江口坝上至其河口沿途设17个采样点,共采集到浮游甲壳动物10科26属33种,其中桡足类4科10属11种,枝角类6科16属22种。
短句来源
     The paper discusses the characteristic and advantage of "3S" technology based on the deficiency of the traditional way about environment dynamic monitoring, and combined the project "the synthetical investigation and evaluation on environment remote sensing in the upper and middle reaches of Minjiang river in Sichuan province", introduces the way and flow on which "3S" applys in environment dynamic monitoring
     针对传统生态环境动态监测方法的不足,论述了"3S"技术的特点与优势,并结合"四川省岷江中上游生态环境遥感综合调查与评价"项目,介绍了应用"3S"技术进行生态环境动态监测的方法和流程。
短句来源
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  middle reaches
The ecological environment in the lower Heihe River has been deteriorating due to large water consumption in the upper and middle reaches, and less available water downstream.
      
New data on the composition of surface assemblages of plant macroremains from soil and swamp samples have been obtained in the study of geomorphologically different localities in the middle reaches of the Nizhnyaya Tunguska River.
      
New data on the composition of surface assemblages of plant macroremains from soil and swamp samples have been obtained in the study of geomorphologically different localities in the middle reaches of the Nizhnyaya Tunguska River.
      
The results of dendroclimatic analysis provide evidence for the prevailing influence of air temperature in July (compared to that in June) on the radial growth of larch in the middle reaches of the Bol'shoi Avam.
      
It is shown that the seasonal variations, typical of the river upper and middle reaches and determining the high level of anthropogenic impact of the fuel and energy complex facilities onto the river, even out in the lower reaches of the river.
      
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Sluicing-Siltation is a new method of dam construction developed by the working people of Shensi and Shansi provinces in the course of the regulation of the Yellow River after Liberation since 1949. It has the advantage of getting greater, faster, better and more economical achievements. At present, this method of dam construction has found wide use ill the middle reaches of the Yellow River. In our Graduation Practice we have carried on in an open door way research work relating to the problem of slope...

Sluicing-Siltation is a new method of dam construction developed by the working people of Shensi and Shansi provinces in the course of the regulation of the Yellow River after Liberation since 1949. It has the advantage of getting greater, faster, better and more economical achievements. At present, this method of dam construction has found wide use ill the middle reaches of the Yellow River. In our Graduation Practice we have carried on in an open door way research work relating to the problem of slope stability of Sluicing-Siltation dams. We, in cooperation with the concerned units, made observations of Chu-Yu prototype testing dam in the Shansi Province and at the same time carried on laboratory experiments and computational analyses. In this paper, through the comparison of the actually measured data of porewater pressure of the dam body of the testing dam with the results of the theoretical com -putations, it is proved that, by applying the theory of consolidation of saturated soil mass to the analysis of porewater pressure of Sluicing-Siltation dam, results which satisfactorily agree with those of the prototype can be obtained. On this basis, by using an electronic computer we have found the distribution of porewater pressure in the dam body under varied boundary conditions, with various kinds of soil, rates of construction work, dam-slopes and dam-heights. Tables of the average porewater pressure coefficients above different elevations are prepared for use in computations. In the present paper, by using the results of triaxial shear test of the consolidated soil slurry, the characteristics of the value of effective strength parameters c' and φ'of normally consolidated soils are analysed, and practical values of c' and φ' for the hydraulie fill soils ordinarily used in the loess region are suggested. At last, according to the characteristics of hydraulic fill soils, two simplified methods based on the theory of effective stress are recommended for analysing the slope stability.

水坠坝是解放以后陕晋两省劳动人民在治黄中创造的一种新的筑坝方法。具有多、 快、好、省的优点,目前这种筑坝方法已在黄河中游地区普遍推广。 水利系水工2班工农兵学员,在毕业实践中,围绕水坠坝边坡稳定问题,开门搞科 研,与协作单位一起在山西曲峪试验坝进行原型观测,同时进行室内试验和计算分析。 本文通过用试验坝的坝体孔隙水压力实测资料与理论计算进行对比,证明饱和土体 团结理论用于水坠坝的孔隙水压力分析,可以得到符合实际情况的结果。在此基础上, 用电子计算机计算出各类边界条件、各种土质和施工速度、不同坝坡和坝高时坝体的孔 隙水压力分布,并做成各高程以上的平均孔隙水压力系数表,以供计算查用。 文中应用泥浆固结土的三轴抗剪强度试验成果,分析正常固结土的有效强度指标 C'、φ'值的特点,并对黄土地区常用的冲填土料提出实用的C'、φ'值。 最后部分,根据冲填土料的特性,提出两种建立在有效应力原理基础上的简易边坡 稳定分析方法。

The characteristics of sediments,such as their sequences,particle-size dis-tribution,constituents of minerals and detritus and the surface features ofquartz grains,are discussed here with respect to environments relative to the upper tributaries,braided channels of the upper-middle reach,meander-ing channels of the middle-lower reach and the deltaic distributary-monthbars within the system of Luan drainage,as well as to the coastal beach,the coastal dume and the beach of the Beidaihe cliffed...

The characteristics of sediments,such as their sequences,particle-size dis-tribution,constituents of minerals and detritus and the surface features ofquartz grains,are discussed here with respect to environments relative to the upper tributaries,braided channels of the upper-middle reach,meander-ing channels of the middle-lower reach and the deltaic distributary-monthbars within the system of Luan drainage,as well as to the coastal beach,the coastal dume and the beach of the Beidaihe cliffed coast.This study showsthat sediments from individual environments mentioned above are differentand,therefore,their features can be used for identifying environments ofsedimentation.The diverse environments are characterized by apparent dif-ferent cumulative probability curves.The constituents of minerals and detri-tus derived from the same source area are functions of transport distance andcurrent agent,especially when they are of unhomogeneous nature.The surfacefeatures of quartz grains are indicative of environments of sedimentation,e.g.of aeolian,marine and fluvial conditions.This study suggests that Luanriver is a middle-small,seasonal and sand-rich one of short source.There-fore,its sediments are abundant in sands with only a few of mud interca-lations.The sand grains is coarse and,in addition,there are gravels andmud gravels at the base of section,the content of minerals is less than thatof detritus,with maturity being lower.The dune is well deveoped on banksof the stream and this demonstrates that the wind may be strong enoughduring the dry season.The delta is resulted primarily from the agent ofstream,but certain tidal action may also be involved.The sediments on thebeach near the Luan river mouth are distinct from that on the beach ofBeidaihe cliffed coast due to the distinction between them.

地史时期与现代的沉积作用是类同的,深刻认识了现代的沉积环境和沉积作用,就能更好地了解和解释古代沉积。近年来对现代沉积的广泛研究,大大地促进了对古代沉积作用及环境的认识。为了更深入地研究我国东部古代的沉积环境,更好地预测有利于油气储集的砂岩体,加速我国油气资源的勘探,我们于1978—1979年曾二次对滦河及北戴河海岸现代沉积进行了观察研究。滦河为一中小型河流,发源于河北省沽源县境内,流向东南,至乐亭县以东注入渤海,全长800多公里,流域面积为4.4万平方公里,年平均泾流量为151亿立方米。它为一砂质性河流,年平均输砂量2450万吨。它也是一季节性河,7、8、9月为洪水期,占全年输砂量的97%,其中8月份占45%。根据地貌及水文特点,滦河大致可分为迁安县以上的上游支流河段,迁安至滦县间为中上游网状河段,滦县至乐亭县为中下游蛇曲河段,乐亭以下则进入三角洲平原,发育分支流河,并向海域延伸,形成朵状三角洲(图1)。滦河发育有二级阶地,一阶地高出现代河床2—3米,二阶地高出18—25米。要正确判断环境,关键在于认识各个环境的成因标志。因此,我们的考察工作主要是研究滦河体系各种环境标志特征,并在此基础上,总结各亚环境的沉积...

地史时期与现代的沉积作用是类同的,深刻认识了现代的沉积环境和沉积作用,就能更好地了解和解释古代沉积。近年来对现代沉积的广泛研究,大大地促进了对古代沉积作用及环境的认识。为了更深入地研究我国东部古代的沉积环境,更好地预测有利于油气储集的砂岩体,加速我国油气资源的勘探,我们于1978—1979年曾二次对滦河及北戴河海岸现代沉积进行了观察研究。滦河为一中小型河流,发源于河北省沽源县境内,流向东南,至乐亭县以东注入渤海,全长800多公里,流域面积为4.4万平方公里,年平均泾流量为151亿立方米。它为一砂质性河流,年平均输砂量2450万吨。它也是一季节性河,7、8、9月为洪水期,占全年输砂量的97%,其中8月份占45%。根据地貌及水文特点,滦河大致可分为迁安县以上的上游支流河段,迁安至滦县间为中上游网状河段,滦县至乐亭县为中下游蛇曲河段,乐亭以下则进入三角洲平原,发育分支流河,并向海域延伸,形成朵状三角洲(图1)。滦河发育有二级阶地,一阶地高出现代河床2—3米,二阶地高出18—25米。要正确判断环境,关键在于认识各个环境的成因标志。因此,我们的考察工作主要是研究滦河体系各种环境标志特征,并在此基础上,总结各亚环境的沉积特点,为今后环境研究提供对比依据。环境标志的研究工作,首先在野外选择典

Studies on macroinvertebrate benthos from upper and middle reaches of Tumen River were carried out between August 1977 and August 1979. The sampler of artificial substrate was mainly used for the 9 sampling stations set in this river. The communities of benthic macroinvertebrates are found abundant in many species, especially so in the upper reaches. The main ones are plecopterans, ephemeropterans, trichopterans, chironomids and aquatic oligochaetes. The data which have been collected for the last...

Studies on macroinvertebrate benthos from upper and middle reaches of Tumen River were carried out between August 1977 and August 1979. The sampler of artificial substrate was mainly used for the 9 sampling stations set in this river. The communities of benthic macroinvertebrates are found abundant in many species, especially so in the upper reaches. The main ones are plecopterans, ephemeropterans, trichopterans, chironomids and aquatic oligochaetes. The data which have been collected for the last three years are used for biological evaluation of the river itself, and to calculate Trent biotic index, Chandler score system and Shannon diversity index. Water in upper reaches can be said clean or moderately polluted, and that in the middle reaches from Caidui station to Tumen station is heavily polluted. Water quality downward from station Hedong recovers to the extent of being lightly polluted.

作者于1977年8月至1979年8月在图们江上中游的9个采样点上,主要使用人工基质采样器采集底栖无脊椎动物。结果证明图们江底栖动物比较丰富,出现的主要种类属于襀翅目、蜉蝣目的稚虫,毛翅目幼虫,摇蚊科幼虫和水栖寡毛类。其中崇善江段种类多,表现出明显的多样性。根据三年来所收集到的资料,计算了Trent生物指数,Chandler记分制以及Shannon多样性指数,并对图们江的污染状况作出生物学评价,上游地段属于清洁水到中污染;中游地段在污染源以下至图们站属于重污染;自河东站开始,水质又明显好转,属于轻污染。

 
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