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coefficient of runoff
相关语句
  径流系数
    The runoff directl y affects delivery ratio (DR). When the depth and coefficient of runoff is larg e,the DR approaches 1,otherwise the DR w ill decreases.
    坡面径流直接影响着坡面的输移比 ,当径流深和径流系数较高时 ,输移比接近于 1,否则输移比降低
短句来源
  径流系数
    The runoff directl y affects delivery ratio (DR). When the depth and coefficient of runoff is larg e,the DR approaches 1,otherwise the DR w ill decreases.
    坡面径流直接影响着坡面的输移比 ,当径流深和径流系数较高时 ,输移比接近于 1,否则输移比降低
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A new metho d called Neutron Activate Analysis Trace r Method (NAATM) for studying soil erosi on was formed through combination tracer method with neutron activate analysis t echnique,and the method was used to stud y the erosion process on slope.The resea rch results showed that the changes of relative erosion amount with the distanc e from slope bottom to top accord with t he Weibull distribution.The shape parame ters of the Weibull distribution...

A new metho d called Neutron Activate Analysis Trace r Method (NAATM) for studying soil erosi on was formed through combination tracer method with neutron activate analysis t echnique,and the method was used to stud y the erosion process on slope.The resea rch results showed that the changes of relative erosion amount with the distanc e from slope bottom to top accord with t he Weibull distribution.The shape parame ters of the Weibull distribution are ma inly affected by precipitation ,duration of rainfall and depth of runoff,and the scale parameters are related with aver age rainfall intensity and I 30 .Soil eros ion and deposition happened at the same time on slope.Generally,deposition is l ess under the short duration rainfall wi th high rainfall intensity than that of long duration rainfall with low intensit y.The relationship between deposition am ount at a certain slope position and its distance was derived.The runoff directl y affects delivery ratio (DR).When the depth and coefficient of runoff is larg e,the DR approaches 1,otherwise the DR w ill decreases.

利用中子活化示踪法研究坡面土壤的侵蚀过程 ,发现坡面的相对侵蚀量从坡脚到坡顶随坡长的变化符合 Weibull分布 ,其形状参数主要受降雨量、降雨历时和径流深度的影响 ,尺度参数主要与平均雨强、I3 0 相关。坡面在侵蚀的同时也发生沉积 ,一般来说短历时高强度的降雨沉积量较小 ,而长历时低强度的降雨沉积量较大 ,某一部位侵蚀产沙的沉积量与其距离之间有 y=axb的关系。坡面径流直接影响着坡面的输移比 ,当径流深和径流系数较高时 ,输移比接近于 1,否则输移比降低

The 3 conclusions were summed up after the runoff,sediment yield,sediment transport rate,the biggest capacity of preserving water and soil were investigated according to the data of the orientation observation about benefit of soil and water conservation of the different forest area types in the red soil regions in South Hunan.First,the coefficient of runoff on the CK land is 1.04~1.21 times than that of woodland, and the coefficient of runoff on the land with better forest is smaller than that on...

The 3 conclusions were summed up after the runoff,sediment yield,sediment transport rate,the biggest capacity of preserving water and soil were investigated according to the data of the orientation observation about benefit of soil and water conservation of the different forest area types in the red soil regions in South Hunan.First,the coefficient of runoff on the CK land is 1.04~1.21 times than that of woodland, and the coefficient of runoff on the land with better forest is smaller than that on the land with bad forest.Second,the sediment yield and sediment transport rate on the CK land are 2.80~3.73 times and 2.58~3.26 times than that of woodland,and sediment yield and sediment transport rate on the land with better forest are smaller than that on the land with bad forest.Third,although the protecting forest in the red soil regions in the South Hunan is young growth,the capacity of preserving water is 1.56~3.08 times than that of CK land, the effects of preserving soil reached 3 860 t/(km 2·a)~4 390 t/(km 2·a).

通过对湘南丘陵区不同林分类型涵水保土效益的定位观测 ,分别对林地的产流量、产沙量、输沙率、最大涵水能力及保土效果进行了探讨 ,发现 :1CK坡面的地表径流系数比有林地的地表径流系数要大 1.0 4~ 1.2 1倍、林分质量越好的林地坡面的径流系数比林分质量较差的林地坡面的径流系数要小 ;2 CK坡面的产沙量、输沙率比有林地的产沙量、输沙率要大 2 .80~ 3.73倍、2 .5 8~ 3.2 6倍 ;林分质量越好的林地坡面的比林分质量较差的林地坡面的产沙量、输沙率要小 ;3湘南红壤区长江防护林的各种林分类型虽然还处于幼龄林阶段 ,但其林地的保土、涵水能力还是比较强的 ,其林地土壤的涵水能力为 CK的 1.5 6~ 3.0 8倍、保土能力在 386 0 t/ (km2 · a)~ 4 390 t/(km2 · a)之间

As one of the most important study fields of global change, land use and land cover change has significant impacts on regional and global climate, soil characteristics, and function of terrestrial ecosystem. Most researchers, both in China and abroad, have given much more attentions to the study on land use types and the laws of regional land cover change with synthetic analysis of the factors that influence land use and land cover change. In recent years, some Chinese researchers have carried on studies in...

As one of the most important study fields of global change, land use and land cover change has significant impacts on regional and global climate, soil characteristics, and function of terrestrial ecosystem. Most researchers, both in China and abroad, have given much more attentions to the study on land use types and the laws of regional land cover change with synthetic analysis of the factors that influence land use and land cover change. In recent years, some Chinese researchers have carried on studies in this field by stationary inspection methodology, e.g., Professor Fu Buojie and others studied the impacts of land use and land cover change on soil nutrients, regional hydrological condition in loess hilly areas and Zunhua low mountainous areas in Hebei province, Professor Shi Peijun and others studied the impacts of land use and land cover change on natural agricultural disasters in Inner Mongolia Autonomous Region on the basis of long period investigations and statistical materials. But few researchers studied the impact of land use and land cover change on soil erosion by stationary methodology, and few papers have been published in this area. This paper studied the impacts of land use and land cover change on soil erosion in Fujian mountainous areas on the basis of analysis on long period observational and experimental materials at Jianou Niukenglong Experimental Station and the Provincial Soil and Water Conservation Station, researched soil erosion mechanisms of mountain grassland ecosystem, and different soil erosion modulus under different land use and land cover types. The analytical results indicate that the coefficient of runoff has minus linear relation with grassland coverage, and the modulus of soil erosion has index relation with grassland coverage. This paper also studied the mechanisms and processes of land cover impacting runoff and soil erosion, i.e., land cover influences runoff and soil erosion through the following processes: 1) The grassland cover reduces the forces of rainfall that beats on earth surface, which will impact soil erosion on the surface of the earth, grassland cover has minus index relation with soil erosion modulus, and minus linear relation with coefficient of runoff. 2)The roots of vegetation strengthens the erosion resisting capacity of soils through interluding, twinning and fixing forces on soil particles, and increases the absorbing water capacity of soils . 3) The increase of soil organic material concentration makes the soil particles and structure more and more stable. This paper also points out that there are other mechanisms and processes that need to be further studied, e.g., the relation between land use/land cover and runoff coefficient, the variations of different vegetation's impacts on soil erosion,etc.

本文以福建省山区为例 ,在对福建省水土保持实验站、建瓯市牛坑龙水土保持试验站长期观测、实验资料深入分析对比的基础之上 ,探讨了土地利用 /土地覆被变化对土壤侵蚀的影响规律。分析结果表明 ,土地利用 /土地覆被变化对径流的产生和土壤侵蚀有重要影响 ,植被的覆盖度的变化直接影响着径流系数和土壤侵蚀模数 ;植被的覆盖度和径流系数呈负线性关系 ,随着覆盖度的增加径流系数逐渐减小 ;植被覆盖度和土壤侵蚀模数为负指数关系 ,随着植被覆盖度的增大 ,土壤侵蚀模数急剧下降。

 
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