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meandering
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  蜿蜒
    Preliminary Study on Forming Condition of Lower Jingjiang Meandering Channels of Middle Yangtze River
    长江中游下荆江蜿蜒型河道成因初步研究
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    Research on mechanism of evolution for meandering river
    蜿蜒性河流演变机理研究
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    (6)meandering reach;
    ⑥宽滩蜿蜒河段;
短句来源
    On the basis of observing and analyzing the data of evolution of meandering rivers, the process of riverevolution was studied from macroscopic view in generalized condition.
    从宏观规律入手,采用概化方法研究了蜿蜒性河流的演变机理。
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    Using the theory for evolution of meandering river, the common and especial evolution laws of Paizhouwan reach during more than 400 years were studied.
    运用蜿蜒性河流的演变理论 ,研究了笑牌 洲湾河段演变的一般性与特殊性规律。
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  “meandering”译为未确定词的双语例句
    THE RELATIONSHIPS BETWEEN THE PATTERNS OF MEANDERING AND ANABRANCHED RIVERS
    弯曲河型与稳定江心洲河型的关系
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    Calculation of Flow on the Floodplain of Meandering Channel
    游荡型河流滩地洪水计算
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    Numerical simulation of flow and bed deformation in meandering rivers considering the erosion of bank
    考虑河岸冲刷的弯曲河道水流及河床变形的数值模拟
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    Three-dimensional numerical model for the meandering flow
    弯曲河流三维数值模型
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    3-D turbulent model of meandering river in non-orthogonal curvilinear coordinates
    非正交曲线坐标下三维弯曲河流湍流数学模型
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  meandering
Data from the fifth voyage of the scientific-research vessel "Dmitrii Mendeleev" are presented, which indicate the asymmetry of the Cromwell flow relative to the equator and its possible meandering.
      
Dual typification of different types of meandering is considered: by the limiting factor (limited and free) and by genesis (developed and undeveloped).
      
It is shown that, within the sheet, the current carriers-untrapped ions-move along meandering trajectories and can maintain an equilibrium structure self-consistently.
      
sand-bed meandering, sand-bed braided, gravel-bed meandering and gravel-bed braided, are located in 4 different areas that can be divided by 2 straight lines.
      
An analysis of the causes of meandering tracks of typhoons
      
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The Regulation of braided stream with heavy sediment load calls for a complete change in river regime of a stream course running hundreds of kilometers long. This is only possible by modifying the hydrograph and the sediment production rate of the watershed and by changing the boundary conditions of the stream channel. The construction of reservoir in the upstream basin upsets the equilibrium conditions of the river downstream of the dam, and a change in regime is expected. The braided river, after gradually...

The Regulation of braided stream with heavy sediment load calls for a complete change in river regime of a stream course running hundreds of kilometers long. This is only possible by modifying the hydrograph and the sediment production rate of the watershed and by changing the boundary conditions of the stream channel. The construction of reservoir in the upstream basin upsets the equilibrium conditions of the river downstream of the dam, and a change in regime is expected. The braided river, after gradually losing its wandering intensity, will transform into a meandering pattern. At the beginning of the adjustment, the shifting of the main current still exists. The channel will be deepened by the passage of water with much smaller sediment concentration. Yet, on the other hand, the recedence of the bank lines under the attack of the ever-shifting current tends to widen the channel. The eventual modification of the cross-sectional form of the degrading reach depends on the interaction of these two types of forces. At low and medium stages, it appears that the deepening of the channel has gained the upper hand. After the passage of a larger flood when the water overflows the flood-plain, a rapid widening of the channel will take place instead. In as much as the recedence of the bank lines is a threat constantly in existence, every effort should be made to cut down the flow released from the dam to a value smaller than the bankfull discharge of the downstream channel, and bank stabilization works must be started immediately after the completion of the dam. The control of the mean-water channel and the protection of the bank lines should be proceeded hand in hand, with the former as the main measure. It is proposed to modify the river course into a succession of smooth bends such that the thalweg will be fixed along the concave side of the bend and low sand banks formed on the other. By using a smooth curve to guide the flow, the jetties and training walls will be subjected to a force evenly distributed along the bend, and this is beneficial for their maintenance. The protection length of the concave bank depends on the radius of curvature of the bend and on the variability of the flow. According to the experiences obtained from one of the sandy rivers in China, the ratio of protection lengths upstream and downstream of the apex of the concave bank is 2 to 3. In the degrading reach, it is sufficient to stabilize the concave side of the bend only. In the transition and aggrading reaches, underwater jetties should also be built along the bank line at the lower half of the convex side of the bend.

在多沙河流上修建蓄水拦沙水庫以后,下游游蕩性河道将逐漸向弯曲性轉化.如下洩清水不超过下游河道的平滩流量,則河床将以下切为主;如水流继续不断漫滩,則河道将逐漸展寬。固定中水河槽是保护滩地,加速河道調整过程的重要途径,应尽量利用已有节点,增加节点数目,并逐步改善节点外形,使其具有曲度适当的弯道型式。文中根据多沙河流的經驗及模型試驗結果,对河湾平面尺寸、护岸导流工程的布置及結构进行了初步探討.

Since the construction of Dan-Jiang-Kou Reservior in 1959, the reservoir regulation has markedly altered the discharge and sediment process in the channel downstream. The flood-peak hydrograph has been lowered and flattened; the period of low flow has disappeared with the discharge becoming constant at 1000-1500m3/s. Sediment load has been reduced from 1.33kg/m3 and the turbid water has become cleaner. Essential changes have taken place in the channel below the reservoir with the effect, of the reservoir regulation...

Since the construction of Dan-Jiang-Kou Reservior in 1959, the reservoir regulation has markedly altered the discharge and sediment process in the channel downstream. The flood-peak hydrograph has been lowered and flattened; the period of low flow has disappeared with the discharge becoming constant at 1000-1500m3/s. Sediment load has been reduced from 1.33kg/m3 and the turbid water has become cleaner. Essential changes have taken place in the channel below the reservoir with the effect, of the reservoir regulation and regional physical conditions. Degradtion has been replaced by aggradation in the channel; the deep scour in channel thalweg by 2-4m has occurred over the whole channel; deep scour has been slowed down with the establishment of the resistant layer, and lateral erosion increased, but far it will go on depends on the boundary conditions. Degradation is dominant in the channel downstream from the reservoir and has extended up to the mouth 630km below the dam. The channel slope has been gradually flattened except for the places near the confluences of major tributaries where the channel slope becomes steeper due to the aggradation caused by these tributaries of heavy sediment load. The relationships between channel geometry and discharge and sediment load have been improved with a relative factor up to more than 0.8 compared with what they iwere. Since the increase of channel depth is more rapid than that of the width while there is no increase in velocity as the depth increases, the channel geometry has been subject to much alteration; the flow has concentrated into the channel; deep scour of the channel has occurred and sinuosity of the channel thalweg has increased. Consequently, the height difference between the bed and surface of bars has increased;branch channels have been filled up and the channel pattern has changed-from multichannel to the single channel, with the width depth ratio being reduced to about 10. Small bars have joined to become big bars and lower bars have been transformed to higher ones which have after then become terraces. Bank slumping has slowed down as a result of stabilization of bank slope and coarsening of bank material.According to the distance away from the dam and regional natural conditions, the channel downstream from the reservior can be divided into three parts of different characteristics, 1, near reservoir reach (Dan-Jiang-Kou-Nou-Shou) which is more than 90Km long and most markedly affected by reservoir regulation and channel adjustment is rapid so that the straight wandering channel has been transformed to the single restricted meander with sinuosity being increased from 1.25 to 1.50; 2, the reach influenced by Tang-Bei-He river; Its length is 70km. In this reach the channl remains wandering as a large amount of coarser material coming from major tributaries has disturbed the channel self-adjustment. 3,the lower reach which has a length of 460km and less affected by the reservoir regulation owing to the long distance from the dam. In this reach lateral migration has become wea kened in the wandering channels whereas the deep erosion has developed and sinuosity has increased in the meandering channels with the effect of bank material.

丹江口水库建库20多年来,下游河道由堆积性河道变成了冲刷性的河道,河床物质沿程粗化,比降得以调平。水深增加幅度大于河宽,流速并不随着水深增加而加快。深槽、浅滩分布明显化,宽深比不断在减少。整个库下游变化可分为三段:1)近库段,游荡河道向单一限制性曲流转化;2)大支流影响段,河道仍保持着游荡特性;3)下游段,游荡段游荡特性减弱,弯曲段则深蚀作用加强。

Based on two groups of model experiments, crustal uplift and crustal subsidence, this paper deals with the laws of river pattern Changes caused by tectonic movement as well as with changes of the sediment character. we have got three basic patterns; straight, meandering and branched in the experiments, among which the branched pattern can be classified into three types. anabranched, multibranched and braided.Crustal subsidence results in lowering the flow energy and accumulating the sediment. According...

Based on two groups of model experiments, crustal uplift and crustal subsidence, this paper deals with the laws of river pattern Changes caused by tectonic movement as well as with changes of the sediment character. we have got three basic patterns; straight, meandering and branched in the experiments, among which the branched pattern can be classified into three types. anabranched, multibranched and braided.Crustal subsidence results in lowering the flow energy and accumulating the sediment. According to regression analysis in several elements of the experimatal data, the discriminating function which decides the river pattern has been gained. it is the meandering pattern; if 1.6<△<2.5, it is the anabranched; if 2.5<△<3.3; it is the multibranched; and if 3.3<△, it is the braided. Crustal uplift brings about increase of the unit stream power .In accordance with the calculations of the experimatal data, we have., transverse profiles get narrower and deeper; φ>1.34, they become wider and shallower.By using quantitative measurement data and qualitative analysis data for the computation of discriminatory analysis, we obtain a space of distinguish, in which all the samples of experimental measurement can be divided into five classes. It is more satisfactory.The results of criterion indicate that each sample shows the nature and variability of the river pattern, Besides, it is inferred that these experiments demonstrate the general tendency of the changes of river patterns influenced by tectonic movement.

本文通过室内模拟试验,探讨了由于地壳构造运动以及由此而导致输沙特性变化所引起的不同河型转化和发育的规律。利用试验测量资料进行多元逐步回归分析,分别得到了地壳沉降与地壳抬升时计算河型转化判据的判别函数。应用数量化理论对试验资料进行综合分析,建立了因地壳构造运动影响而形成的五种河型的判别空间,并由此分析了地壳构造运动对河型转化影响的一般规律。

 
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