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rill
相关语句
  细沟
    Research Methods of Rill Erosion Process
    细沟侵蚀过程的研究方法
短句来源
    Study on Sloping field Erosion under Simulated Rainfall on Loess Btoken Platea the Comprehensive Analysis of Factors Effected on Rill Erosion
    黄土残塬区人工降雨条件下坡耕地水蚀的研究(Ⅰ)──影响细沟侵蚀因素的综合分析
短句来源
    Study on Self-organization of Soil Rill Erosion on Slope
    坡面土壤细沟侵蚀自组织分析
短句来源
    Research on the Spatial Distribution Characteristics of Slope Rill Erosion
    坡面细沟侵蚀垂直分布特征研究
短句来源
    Laboratory Experiments of Rill Initiation and Critical Shear Stress in Loose Soil Material
    水流作用下疏松土壤材料中细沟的再生及其临界剪应力的实验研究
短句来源
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  “rill”译为未确定词的双语例句
    rill erosion and shallow gully erosion, (3 ) the annunal average erosionmodule was 8 373t/km2, annunal erosion module with > 25° slope land and < 1O % coverdegree was 1 8OOt/ktn2 , annunal erosion module with 15 ~ 25° slope land and grass-forest landwith 10 %~ 30% cover degree were 1 5OOt/km2 and 1 2OOt/km2 respectively.
    (3)该区多年平均侵蚀模数为8373t/km2,其中以坡度大于25°的耕地和植被盖度小于10%的荒草地侵蚀强度最大,年侵蚀模数为18000t/km2,坡度为15~25°的耕地及植被盖度为10%~30%的林草地年侵蚀模数分别为15000t/km2和12000t/km2。
短句来源
    the rill relative erosion amount hi the bottom section obviously decreased from 92% to 37%, but the other three sections gradually increased from 4.7%, 0.25%, 2.14% to 29 %, 17% and 23% respectively because of the headcut erosion.
    由于溯源侵蚀,最下部坡段的相对侵蚀量从92%减少到 37%,呈显著下降趋势,其它 3个坡段则分别从4.7%、0.25%、2.14%增加到 29%、17%和 23%。
短句来源
    Soil Erosion and Its Prediction on Slope Surface in the Gullied Hilly Loess Region of Western Shanxi Province (Part of Rill Erosion)
    晋西黄土丘陵沟壑区坡面土壤侵蚀及预报研究
短句来源
    STUDY ON SOIL RILL AND INTER-RILL EROSION USING SIMULATOR RAINFALL IN SUBTROPICAL CHINA
    用人工模拟降雨研究亚热带坡耕地土壤的沟蚀和沟间侵蚀
短句来源
    Using REE Tracers to Measure Sheet Erosion Changing to Rill Erosion
    坡面侵蚀形态转变过程的REE示踪法研究
短句来源
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  rill
government policies, total soil erosion between 1982 and1992 was reduced by 32% and the sheet and rill erosion ratefell from an average of 4.1 tons per acre per year in 1982 to 3.1 tons per acre in 1992.
      
Surface erosion (sheet plus rill) removed between 15 and 18 Mg ha-1 of soil from the burned plots.
      
In the medium-term, the time-integrated 137Cs technique is ideal for the Brie Plateau, where overland flow does not produce significant rill erosion features in the landscape.
      
Bedrock-incised rill erosion occurs at low RMS (Rock Mass Strength) values (40-50).
      
The resulting data was compared to froms of erosion observed in the field to test for possible influences of rock physical properties on rill and gully development.
      
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The main regions of sediment yield lie on the both sides of Huang He from Hekouzen to Lunmen, and in the upper and middle reaches of Jinhe, Lohe and Wehe river on the Loess Plateau. The sediment yield is concentrated in the period from July to September, or in one or two rainstorms .The delivery ratio approches to in the watersheds on the Plateau. Sediment yield in a small catchment is the result of both physical factors and human activities.Soil erosion is proportional to the addition of precipitation and the...

The main regions of sediment yield lie on the both sides of Huang He from Hekouzen to Lunmen, and in the upper and middle reaches of Jinhe, Lohe and Wehe river on the Loess Plateau. The sediment yield is concentrated in the period from July to September, or in one or two rainstorms .The delivery ratio approches to in the watersheds on the Plateau. Sediment yield in a small catchment is the result of both physical factors and human activities.Soil erosion is proportional to the addition of precipitation and the depth of runoff and increases with the gradient of the ground surface, while the runoff flow erosion decreases on the slope of over 25°-28°. Clayly loess is present in the south part of the Plateau and coarse loess in the north. Scrub is better for soil conservation than other vegetations. The sediment yield has been increasing in the last 30 years in the lower reaches of the Huanghe. The artificial increase is about 23-35% of the mean transporting sediment.The pattern and intensity of soil erosion vertically change from the top to bottom in the small catchment. Rill erosion dominates in the intergully, and gully bank is an area of multi-functions of water erosion, gravitational and cavern erosions. The sediment output in gully bank is abnut 59% higher that in the Loess region of gullied-hilly, and most sediment yield from the gully bank is in the Loess gullied-table areas.

黄土高原的主要产沙地区是河口镇至龙门黄河干流两侧和泾、洛、渭河中上游,产沙时间集中 7—9月或一、二次暴雨期。流域产沙量与河道断面输沙量基本一致。产沙最与降雨量加径流深组合因子成正比相关,并随坡度增大而增加,坡度超过25—28度水流面蚀强度减弱。砂黄土的可蚀性最大,黄土其次,粘黄土最小。灌木林的防蚀效果最好。近三十年来黄土高原的产沙量进一步增加,其中由人类活动而增加的沙量约占黄河平均输沙量的23~35%。 沟道流域的产沙过程具有垂直分带规律。沟间地以细沟侵蚀产沙为主,沟谷地是水力、重力和洞穴侵蚀综合作用的场所。黄土丘陵区沟谷地的产沙量此沟间地大59.0%左右;黄土塬区产生的泥沙绝大部来自沟谷地。

This paper has analysed genesis and development of rill erosion andits control measures on slope land based on simulated rainfall andfield investigation data.It is considered that in the detachmentflow-way of slope surface,as the runoff erovisity is great enough to washsoil lump and to form waterfalls,further the waterfalls evolving intoheadcuts in rill,rill erosion occures and develops.Unconnected rillsare formed by downward erosion of headcuts and runoff washing torill bottom between headcuts,drawing...

This paper has analysed genesis and development of rill erosion andits control measures on slope land based on simulated rainfall andfield investigation data.It is considered that in the detachmentflow-way of slope surface,as the runoff erovisity is great enough to washsoil lump and to form waterfalls,further the waterfalls evolving intoheadcuts in rill,rill erosion occures and develops.Unconnected rillsare formed by downward erosion of headcuts and runoff washing torill bottom between headcuts,drawing back of the headcuts and collap-sing of the rill wall.Thus the connection of many unconnected rillheadeuts drawing back forms connected rill in a flowway of the detach-ment flow.Meantime,merging and connecting of the rills happenbecause rainfall and runoff erovisity is more or less than soil erosiondurability to change in time and space.The above process not onlyfurther promotes genesis and development of rill,but also creates severerill erosion.It is considered that zero-tillage and remained residue and mulch onthe summer fallow land,level ditch cultivation and strip alternation ofgrass and agricultural crope on the crope land,steep-slope farmlandretired and forest and grass planted are effective control measures ofrill erosion.

在坡面股流的流程上,当径流侵蚀力增大到足以冲刷土块,形成小跌水,进而演化为细沟下切沟头时,细沟侵蚀就开始发生了。下切沟头的下切侵蚀和下切沟头间径流对沟底的冲刷、沟头的溯源侵蚀、沟壁的崩塌形成了断续细沟。而一条股流的流程上多个断续细沟溯源侵蚀的连接,就形成了连续细沟。在这个过程中,由于降雨径流侵蚀力和土壤抗侵蚀力在时空上的强弱对比关系,出现细沟的分叉、合并及连通现象。所有这些过程,不但进一步促进了细沟的发展,而且随之造成严重的细沟侵蚀。夏休闲地的免耕留茬,秸秆覆盖,水平沟种植,草粮带状间作,陡坡地的退耕还林、还草,是防治细沟侵蚀的有效措施。

Recently, study on sediment production by erosion and matter migration is carried out in catchment, as a unit, with which eroded sediment production, transportation and deposition processes have been researched. Therefore, the catchment is taken as an open system with input, transfer and output of energy and matter.Erosion is one of the external cause to produce surface matter transfer, through which soil and bedrock will be damaged, and thus, it is a main focus on processes of erosion, transportation and deposition...

Recently, study on sediment production by erosion and matter migration is carried out in catchment, as a unit, with which eroded sediment production, transportation and deposition processes have been researched. Therefore, the catchment is taken as an open system with input, transfer and output of energy and matter.Erosion is one of the external cause to produce surface matter transfer, through which soil and bedrock will be damaged, and thus, it is a main focus on processes of erosion, transportation and deposition in drainage basin. Mechanics and' characters of migrating material were neglected in early study on sediment production processes in the United States, and lately, it was focused on rainsplash erosion and transport processes by runoff, and spatial differences for slope erosion processes in the belt between rills. Russian scientists have recongnized that erosion intensity is constrained by many hydraulic figures, from which therefore the erosion processes are classified.By using soil erosion prospect equation, the local erosion can be estimated, but it is necessary to combine with sediment delivery ratio. Aecording to investigation, the sediment delivery ratio of the loess plateau is larger than that of other countries, in addition, in this paper, a sediment load method to estimate rill-gully erosion intensity is also introduced.For the transport of river sediment, two methods are explained, first, one-two dimension matematical model to compute river sediment load, and mathematical model of sediment transportation effected by base level vibration, second statisticl analysis of sediment transport in natural river, and finally, the purpose of study on erosion.sediment production and transportation are briefly dealt with

联系当前全球土壤流失的现状,本文阐明研究侵蚀产沙和物质输移规律的重要性,从侵蚀产沙和物质输移的流域系统概念出发,并结合我国黄土高原的治理,扼要介绍国内外这一领域的研究概况。

 
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