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dune development
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  沙丘发育
     The bottom current at 20~100 cm/s is the dynamic factor for the development of sand dunes,and the multidirectional currents and occasional wave flow often restrict the intensity of dune development and also the speed of migration.
     20~100cm/s的底流速是发育沙丘的动力因素,水流的多向性和浪流的偶发性又常常制约沙丘发育的强度和迁移的速度;
短句来源
     The statistical data for the morphologic parameters show that on the mode of the simple crescent, dunes were first developed to simple transverse dunes, and then to compound/complex dunes, with the increase of the sand supplies, the time scale for the dune development, and other factors such as wind regimes, vegetation. It is difficult to express the relations of the morphologic parameters of the complex dunes.
     沙丘形态参数的统计数据表明 ,在简单形新月形沙丘 -简单形横向沙丘 -沙丘复合体的发展模式中 ,随沙源供应的增加 ,沙丘发育时间系列的延长以及其他因素如 :风环境、植被等因素的作用 ,沙丘形态参数之间很难有确切的关系表达式 .
短句来源
     Many natural phenomena and natural disasters have close relation with granular materials avalanche, i.e. sand dune development and movement, debris flow, snowslide and earthquake.
     沙丘发育和前移、泥石流、雪崩、地震等诸多自然现象和自然灾害都与颗粒物质的崩塌有着紧密的联系。
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  “dune development”译为未确定词的双语例句
     The results show that Artemisia sphaerocephala could only maintain as dominant or condominant for a short period in the case of mixed seeding with other species. Its population coverage usually reached the maximum in 3 or 4 years after the seeding and then declined at different rates according to degrees of the dune development in the seeded areas.
     研究表明,在与其它植物种混播的情况下,籽蒿在群落中作为优势种或共优种的时间很短,一般在飞播后3~5年内种群盖度达到最大值,然后以不同的速率从播区中退出,播区沙丘越高大,其衰退速率越慢。
短句来源
     Morphologic parameters of the simple transverse dunes in Taklimakan Desert show that the morphologic parameters are closely related with the sand supplies. There are variations for the relations between the parameters because of the difference of the terrain of the dune development.
     通过对塔克拉玛干沙漠不同区域发育的简单横向沙丘的形态学示量特征分析 ,表明简单横向沙丘的形态特征与沙源的供应有十分密切的关系 ,沙源的不同丰度导致简单横向沙丘的形态学参数之间有明显的不同 .
短句来源
  相似匹配句对
     s development.
     (4)中国的产业带及其发展。
短句来源
     development;
     发育;
短句来源
     Development Condition and Dynamic Change on Coastal Dune in the Changli
     昌黎海岸沙丘的发育条件及动态变化
短句来源
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  dune development
The presence or absence of forest shelter belts also influences deposition and dune development patterns and transformation of dune forms.
      
The source of sand for dune development at this site is from these nearshore bars.
      
Sediment distribution patterns can affect sand dune development and soil nutrient and moisture retention.
      
It was qualitatively assessed as having an influence on dune development.
      
As expected, there is less disturbance of the flow field as the dune development reaches the steady state situation.
      


Star dunes are characterized by their pyramidal morphology and radian sinuous arms.A.B. Phidolowiqi (1960) previously pointed out that there are some closely relationships between the star dune development and the multidirectional winds which are created by topographic obstruction. D.Mader (1985), J.Nielson, etc. (1987) successively inferred and confirmed that the star dunes are created from some other dune types which are migrated to the complex wind-regime areas. On the basis of the field...

Star dunes are characterized by their pyramidal morphology and radian sinuous arms.A.B. Phidolowiqi (1960) previously pointed out that there are some closely relationships between the star dune development and the multidirectional winds which are created by topographic obstruction. D.Mader (1985), J.Nielson, etc. (1987) successively inferred and confirmed that the star dunes are created from some other dune types which are migrated to the complex wind-regime areas. On the basis of the field observations, N. Lancaster (1989) systematically put forward a model for the star dune formation and development,and researched the grain-sine characteristics of the star dunes. E.D. Mckee (1982),J.Nielson, etc. (1987) preliminarily uncovered the depositional structure of the star dunes.In this paper, some new progresses of the study on the star dunes are comprehensively reviewed.

本文阐述了近年来在星状沙丘方面的研究进展,介绍了国内外星状沙丘的形成发育模式、粒度特征和沉积构造特征方面的理论及研究成果.

The population dynamics of the three main plant species with which different kinds of dunes in Maowusu sandyland were aerially seeded was investigated.The results show that Artemisia sphaerocephala could only maintain as dominant or condominant for a short period in the case of mixed seeding with other species.Its population coverage usually reached the maximum in 3 or 4 years after the seeding and then declined at different rates according to degrees of the dune development in the seeded areas.The more...

The population dynamics of the three main plant species with which different kinds of dunes in Maowusu sandyland were aerially seeded was investigated.The results show that Artemisia sphaerocephala could only maintain as dominant or condominant for a short period in the case of mixed seeding with other species.Its population coverage usually reached the maximum in 3 or 4 years after the seeding and then declined at different rates according to degrees of the dune development in the seeded areas.The more developed the dune was,the slower of the decline rate.The coverage of Hedysarum laeves had been maintaining increase in the first 10~15 years after seeding,and the period of being dominant was much longer.Hedysarum scoparium,because of its sparse growth habit,had a lower predominance in the communities.Its coverage kept rising in the first 5 years following seeding,and then went slowly down or kept stable.

本文讨论了毛乌素沙区3个主要飞播植物种在不同沙丘类型区域飞播后种群盖度的消长动态。研究表明,在与其它植物种混播的情况下,籽蒿在群落中作为优势种或共优种的时间很短,一般在飞播后3~5年内种群盖度达到最大值,然后以不同的速率从播区中退出,播区沙丘越高大,其衰退速率越慢。羊柴在飞播后的前10~15年内种群盖度一直保持着上升趋势,它在播区内作为优势种的时间要比籽蒿长得多,而且以它为优势种的单优群落具有强烈的排它性。花棒由于其散生的习性,飞播后在群落中的优势作用不是很强,一般在飞播后前5年种群盖度呈增长趋势,然后缓慢下降或基本保持稳定。

This project was carried out along the 2 km test section of the Tarim Desert Oil transportation Highway, south of Xiaotang from October, 1991 to October, 1993. The monitoring sample plot selected was 100 m×100 m in area and located on 200 m east of the highway. Detailed morphological survey method was adopted. Three times of morphological survey were made in October of 1991, 1992, 1993 respectively. The corresponding landform maps were prepared. Measured geometric parameters of dunes were used to derive their...

This project was carried out along the 2 km test section of the Tarim Desert Oil transportation Highway, south of Xiaotang from October, 1991 to October, 1993. The monitoring sample plot selected was 100 m×100 m in area and located on 200 m east of the highway. Detailed morphological survey method was adopted. Three times of morphological survey were made in October of 1991, 1992, 1993 respectively. The corresponding landform maps were prepared. Measured geometric parameters of dunes were used to derive their quantitative relationships by regression method. By comparing the morphology maps of different terms, the magnitude, direction and morphological change of dune movement were derived. Results indicate that the range of dune movement is closely related to dune height, base area and volume. The distance of sand dune movement decreases linearly with the increase of dune height and base area, but exponentially with the dune volume. Similar multivariate function can be applied to express the relationship between dune movement and height, base area, as well as volume for different terms. The range of dune movement from October, 1991 to October, 1992 was greater than that from November 1992, to October, 1993, but the direction of slipfaces changed less. This indicates that the faster movement from October, 1991 to October, 1992 was determined by the more intensive wind and less morphological adaptation. The dune movement direction depends on the annual resultant wind direction, but is also influenced by the extent of dune development. The underdevelopment of the sand dunes within the survey plot results in the instability of dune movement direction. In the course of sand dune movement, some small dunes merged into bigger ones, while some typical barchan dunes degraded into sand sheets or disappeared. In summary, the underdevelopment resulting from insufficient sand supply can be shown by the relationships between different dune geometric parameters, dune movement and the morphological change.

通过对肖塘南2km试验路段100m×100m沙丘移动监测区1991年10月、1992年10月及1993年10月的3次详测,总体上可以认为,沙丘各几何形态参数间存在着较好的相关性。但限于沙源供应不足,沙丘发育具有不成熟性,从而使有些沙丘几何形态参数间不存在理论上应具有的相关性。沙丘高度与宽度有较好的线性正相关关系,与底面积及体积存在较好的指数正相关关系。从而可以认为,沙丘高度是反映沙丘形成、规模及发育程度的较好示量指征。沙丘移动方向随主风向的改变而改变,并与落沙坡方向有明显的不一致性。沙丘移动强度与高度、底面积成线性负相关关系,而与体积成指数负相关关系。在不同时期,上述关系可用相似的多元线性方程表示。沙丘前移过程中,沙丘形态既有由不成熟到成熟的正向演变又有由成熟向不成熟的逆向演变过程。

 
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