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sediment reduction
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  减沙
     the total sediment reduction is 166~279 million tons and the benefits 10.1%~17.1%.
     总减沙量为1.66~2.79亿t,减沙效益为10.1%~17.1%。
短句来源
     In the same natural condition, runoff and sediment reduction benefit of forest land were 27.5% and 47.7% separately; in the condition with land preparation measures, run off amount of forest land redueed by 42.2% ~ 77. 1% comparing with natural slope land.
     在相同自然条件下,林地减水效益为27.5%,减沙效益为47.7%,在有整地措施条件下,林地径流量较自然荒坡减少42.2%~77.1%.
短句来源
     the DRCA should be more than 60 000 m3/km2 if the sediment reduction effect of the comprehensive watershed control of soil and water conservation achieves 20%.
     要使流域水土保持综合治理减沙效益达到20%以上,坝库单位面积库容应在6万m3/km2以上。
短句来源
     (3)In the areas with high and coarse sediment yield of middle reaches of Yellow River,if the sediment reduction effect reaches 40%,the DRCA should excess 160 000 m3/km2.
     (3)在黄河中游多沙粗沙区,要实现40%左右的减沙效益,坝库单位面积库容应达到16万m3/km2以上。
短句来源
     (2)In the north of Shaanxi,the sediment reduction is mainly attributed to the dam and reservoir engineering,the DRCA of 50 000 m3/km2 can increase 10% in trap efficiency;
     (2)陕北片减沙效益主要由坝库工程产生。 减沙效益提高10%,坝库单位面积库容需要提高5万m3/km2。
短句来源
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  拦沙
     Estimation of sediment reduction by water and soil conservation of Guanting reservoir watershed in recent twenty years
     近廿年来官厅水库流域水土保持拦沙量估算
短句来源
     The ratio of siltation reduction including benefits of water and sediment regulation in advanced 50years for each design is 0.815 to 1.238,and the total sediment reduction in lower reaches is 8, 600 to 12,800 million tons that is equivalent to non-siltation life of 24 to 36 years with significant sediment reduction in lower reaches of Aishan.
     各方案50年内包括调水调沙效益的拦沙减淤比为0.815~1.238,下游总减淤128~86亿t,相当不淤年限为36~24年,艾山以下河道也明显减淤。
短句来源
     At present, the  effect of the sediment interception of these artificial sinks is 2.4~6.3 times as high as that of the sediment reduction with the slope measures such as land terracing and tree-and grass-planting. This indicates that these direct erosion-reduction measures should be strengthened in the middle Yellow River basin.
     在目前状况下,人工沉积汇的拦沙作用相当于坡面措施减蚀作用的2 4~6 3倍,表明坡面治理措施的有效性尚有待提高,并亟待在生态环境建设中予以加强。
短句来源
     ② To extend the period of sediment retaining for sediment reduction of the lower reaches and;
     ②为下游减淤尽量延长拦沙期;
短句来源
     In the lower Jinsha river, watershed management treatment should be perfected, reforestation on gully bed should be strengthened and sediment retention dams or hydro power projects with sediment reduction benefit should be paid attention.
     金沙江下游区,要完善小流域治理措施配置,重视沟底林建设和考虑修建拦沙工程或具有拦沙效益的水利水电工程。
短句来源
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  “sediment reduction”译为未确定词的双语例句
     In general, in the period from 1970 to 1999, decrease in precipitation is main reason that caused water and sediment reduction, and its influence account for 63.1% and 73.6% of total reduction of water and sediment respectively.
     总的来看,1970~1999年期间,降水减少是孤山川流域水沙减少的主要原因,其影响量分别占到径流、泥沙总减少量的63.1%和73.6%。
     Through technical and economic comparison on the reservoir level of 265m, 270m and 275m, the benefits of flood control, irrigation and ice run control of each scenario are the same and all the requirements can be met, but the benefits of sediment reduction of eleva tion 275m scenario is the maximum.
     对小浪底水库蓄水位265m、270m和275m的技术经济比较,各方案的防洪、灌溉和防凌效益相同,均可满足要求,但蓄水位275m方案的减淤效益最大。
短句来源
     Doting the 10 years, from 1983 to toe end of 1992, the newly increased harnessed area was 1129 km~2, the accumulative degree of harnessment of the river basin reached 57. 6%, Methods of hydrology and of soil conservation were used separately to analyze the benefits of sediment reduction gained since the introduction of key harnessment.
     三川河流域自1983年列入全国八大重点治理区后,至1992年底止,10年新增治理面积1129km~2,流域累计治理程度达到57.6%。
短句来源
     Based on the theory of runoff regulation as research guide, and with the combination of scouring water experiment in the slope and artificial simulation experiment, this paper studied the process of the surface runoff production and change, analyzed effects of different runoff regulation measurements on soil storage water and runoff and sediment reduction.
     本文以径流调控理论为指导思想,通过坡面放水冲刷试验和人工模拟降雨相结合的方法,研究裸地坡面降雨径流的发生、变化过程,分析了不同措施坡面调控的土壤储水效应、水沙效应,并从坡面水流水力学、动力学、水流受阻状况以及表层土壤微结构等方面探讨了坡面水沙调控机理。 得出以下主要结论:
短句来源
     Analysis of Measures and Effectiveness of Sediment Reduction of Toutunhe Reservoir
     头屯河水库排沙减淤的措施及效益分析
短句来源
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  sediment reduction
Reductions in sediment concentrations were less evident compared to mass basis, indicating that infiltration may be a more important sediment reduction mechanism than particle settling.
      
Agricultural Sediment Reduction by Giant Cane and Forest Riparian Buffers
      
From the textural mixture and weight loss over 40 km tumbling, we applied regression techniques to generate a predictive equation for Sediment Reduction Susceptibility (SRS).
      
We outline a new method to extrapolate from laboratory experiments to the field using a geographical information system approach to model sediment reduction susceptibility for the Canterbury Bight.
      
A GIS Approach to Model Sediment Reduction Susceptibility of Mixed Sand and Gravel Beaches
      
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The kernel of planning on harnessing the Yellow River is to utilize and to treat the resources of water and sediment of the Yellow River unitedly, including combination of promoting what is beneficial and abolishing what is harmful. In view of distinctive law of water and sediment of the Yellow River, the guiding ideology of planning shou- ld be placed on actual situation of the Yellow River valley, combining flood prevention and sediment reduction, leaving some leeway as considering the prospects of flood...

The kernel of planning on harnessing the Yellow River is to utilize and to treat the resources of water and sediment of the Yellow River unitedly, including combination of promoting what is beneficial and abolishing what is harmful. In view of distinctive law of water and sediment of the Yellow River, the guiding ideology of planning shou- ld be placed on actual situation of the Yellow River valley, combining flood prevention and sediment reduction, leaving some leeway as considering the prospects of flood prevention and sediment reduction and its overall plan. On evaluation of soil and water conservation of the loess plateau, emphasis should be placed mainly on turning poor and backward into prosperous for the local people, as to sediment reduction for the lower fellow River, it should be considered as another problem with different nature. Based on this point, the classification of type of soil loss area in the loess plateau could not be divided only based on how many sediment being transported to the lower reaches. The author has also put forward some opinions on problems of project layout on the main river, improvement of existing systpms of flood prevention, further study on prossibility of increasing the capability of sediment transport, planning of flow passage into sea and rational utilization of water resources of the Yellow River as well. The author suggests that to strengthen the harnessing and developing works of the delta in the estuary zone of the Yellow River should be carried through the combination of departments concerning on harnessing the Yellow River and departments on petroleum. The opinions on making better and rational utilization of the water resources through technological transformation of taking economizing on water as a key has also been put forward in the paper.

治黄规划的核心是统一安排黄河水沙资源的利用和处理,其中包含着除害与兴利的结合。鉴于黄河的水沙具有其独特的规律,在规划的指导思想上,应强调从黄河流域的实际情况出发,把防洪与减淤结合起来,考虑防洪、减淤的前景及其总体布局时应留有余地。对黄土高原水土保持的评价应该主要着眼于为当地人民治穷致富,为下游减沙应作为另外一个不同性质的问题,应将二者区别开来。基于这一点,不能单从向下游输沙多少的观点来划分水土流失类型区。作者还就干流工程的布局问题、完普现有防洪体系问题、进一步研究增大河道输沙能力的可能性问题、入海流路的规划问题以及黄河水资源的合理利用等问题提出了一些意见。作者建议治黄部门与石油部门结合起来,加强黄河河口三角洲的治理与开发,并提出通过以加强节水为中心的技术改造,促使黄河水资源更好的合理利用。

The changes of water and sediment of the Yellow River in flood season make the base flow entering into the lower river reduced, sediment concentration increased, more opportunity for occurring flow with hyper-concentration of sediment and run out of water for a long time will be happened during the peak period of irrigation. To transport flow with hyper-concentrated Sediment into sea by a narrow and deep channel can not only reduce the severe siltation in the lower Yellow River, but also provide a large amount...

The changes of water and sediment of the Yellow River in flood season make the base flow entering into the lower river reduced, sediment concentration increased, more opportunity for occurring flow with hyper-concentration of sediment and run out of water for a long time will be happened during the peak period of irrigation. To transport flow with hyper-concentrated Sediment into sea by a narrow and deep channel can not only reduce the severe siltation in the lower Yellow River, but also provide a large amount of clear water to north China. The different mode of water regulation for scouring by Xiaolangdi Reservoir and the benefits of sediment reduction of the lower river course have been described in the paper. It is shown by the calculation results that when the capacity of Xiaolangdi Reservoir for sediment regulation is 2.5 billion m~3, the annual mean siltation of teh lower river course can be reduced to about 100 million tons.The paper also takes Beiluo River as an example to depict the prospects of harnessing the lower course of the Yellow River.

黄河水沙变化使汛期进入下游的基流减小,含沙量增加,高含沙洪水出现的机会增多,在灌溉用水旺季将出现长时间断流。然而利用窄深河槽输送高含沙水流入海,不仅可以减轻黄河下游的严重淤积,还可向华北地区提供大量清水。文中给出了小浪底等水库不同调水冲刷方式,下游河道的减淤效益。计算成果表明,当小浪底水库的调沙库容为25亿m~3时,下游河道的年平均淤积量可减少到1亿多吨。文中还以北洛河为例,给出黄河下游河道的治理前景。

The benefit of reservior and water conservancy and soil conservation measures in reducing oncoming sediment to the Yellow River are dealt with in this paper from the angle of relation between rainfall and sediment yield and of sediment-retention mechanism. It is shown that oncoming sediment is reducing by 300 million ton per year. It is possible to reduce oncoming sediment by 400 million ton or more per year in future 60 years while sediment reduction is kept in harnessing level as in past 30 years.

本文从水利水保工程的拦沙机理入手,论述了水库和水土保持减少入黄泥沙的作用。通过分析计算得出目前入黄泥沙每年减少2亿t左右;如果今后60年在多沙地区仍按过去30年的速度治理,将保持或略高于目前的减沙水平,即60年后每年减少入黄泥沙4亿t左右。

 
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