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水面形状
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  the shape of water surface
     Analyses of the shape of water surface
     关于水面形状的分析
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  water surface shape
     At the beginning, the dissertation using different data to reflecting the water surface characteristic to explain how the difference water surface shape to influence the visual of lake and surrounding space.
     本论文首先对湖泊水域形态进行数量化对比,以不同的数值来反映水面各种形状特征,以此说明水面形状的差异对风景湖区和毗邻城市空间的渗透和分隔上的视觉影响。
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     The water surface shape in an uncovered water tank moving on a smooth plane with constant acceleration a is concretely analyzed, and the calculating formula for the angle of the stable water surface and horizontal plane is given out.
     对以恒加速度沿光滑平面运动的无盖水箱中的水面形状进行了具体分析,并给出了计算水箱中水稳定时液面与水平面夹角的公式·
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  “水面形状”译为未确定词的双语例句
     Numerical simulations describe the evolution ofthe seawater surface and vorticity field in the interaction process。 The effects of Reynoldsnumber,Koude number,and weber number on the surface deformation are discussed。
     数值模拟给出了在旋涡与水面相互作用过程中,水面形状和涡量场的演化,还讨论了Froude数、Reynolds数和Weber数对水面变形的影响。
短句来源
     In order to spread applying suspended slabs to sediment prevention works of low head water diversion projects, some experiences with applying suspended slabs to stratified water diversion and desilting funnel are summarily described as follows:after changing a Pishiweir for a streamlined weir, under condition of that the cross section, which is below the slab, average flow velocity decreases a bit, then the configuration of the water surface above the slab will to be more simple, it will improve effects of water diversion and desilting;
     为了推广悬板在低水头引水防沙工程中的应用 ,概括介绍了悬板在悬板分层式引水和排沙漏斗中的成功应用经验 :将皮氏堰改为流线堰后 ,在悬板下断面平均流速减小不多的情况下 ,悬板上水面形状更为简单 ,可改善枢纽的引水防沙效果 ;
短句来源
     Tests are made to verify whether the sy ̄mmetrical leading surface and the additional fin as well as the location of the fin base have any influence on stability of the system.
     分别测试了迎水面形状对称与否、有无附加鳍以及附加鳍位置对稳定性的影响.
短句来源
  相似匹配句对
     Analyses of the shape of water surface
     关于水面形状的分析
短句来源
     Between Air and Water
     水面世界
短句来源
     COMING TO THEWATER SURFACE
     浮出水面
短句来源
     A Representation of Form Features
     形状特征的表示
短句来源
     SHAPE OPTIMIZATION OF BEAM-COLUMNS
     梁柱的形状优化
短句来源
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  water surface shape
A relationship similar to that between water surface shape and uneven wall surface for supercritical flow was observed.
      
The wave length was approximately 4 cm as for the water surface shape in Figure 11.
      


Among the difficult problems in hydraulics is the flow with a free urface,because, not known a priori,it has to be determined as a part of the solution.A finite element method based on the variational principle for variable domains is proposed for this type of problems. As shown in Fig.1, the domain of solution is divided by a prescribed F curve into two sub-domains,the fixed ABEPQGMNOA and the variable EFQPE with the free stream line as its boundary. Triangular elements and linear distribution of ψ are adopted...

Among the difficult problems in hydraulics is the flow with a free urface,because, not known a priori,it has to be determined as a part of the solution.A finite element method based on the variational principle for variable domains is proposed for this type of problems. As shown in Fig.1, the domain of solution is divided by a prescribed F curve into two sub-domains,the fixed ABEPQGMNOA and the variable EFQPE with the free stream line as its boundary. Triangular elements and linear distribution of ψ are adopted for the inner region,while trapezoidal elements and linear distribution of q2 for the variable domain. The unknowns to be solved for are the values of ψ of the nodes and the ordinates of points on the free surface. Equating the partial derivatives of the functional to zero furnishes enough equations,thus,the location of the free surface and the values of ψ are solved for simultaneously. The method is applied to free surface sluice gate flow over spillway and computed pressure distribution agrees satisfactorily with experimental results.

用有限元法计算水力学问题的困难之一是如何处理自由水面.因自由水面的位置在计算前是不知道的,求解的区域就不能预先确定.常用的方法是先假定自由水面的位置,把问题当作具有已知边界的问题来计算,然后校核沿自由水面的条件是否满足.如不满足,再重新修改自由水面的位置进行计算,直到能满足为止.本文建议,从可变区域的变分概念出发,把决定自由水面形状的座标和各结点的流函数值当作未知量,形成方程组同时求解.用这种方式可以减少计算的工作量,算出的溢流面压力分布资料和试验结果符合较好.

he finite-difference solutions of Navier-Stokes equations are employed to inves-tigate the inetraction between a submerged vortex pair and the sea-water surface。The initialstate of the vortex model is Oseen vortex。Numerical simulations describe the evolution ofthe seawater surface and vorticity field in the interaction process。The effects of Reynoldsnumber,Koude number,and weber number on the surface deformation are discussed。

采用Navier-Stokes方程的有限差分数值解来研究水下生成的旋涡在浮升过程中与水面的相互作用,旋涡的初始模型为Oseen涡。数值模拟给出了在旋涡与水面相互作用过程中,水面形状和涡量场的演化,还讨论了Froude数、Reynolds数和Weber数对水面变形的影响。

In 1972. It was discovered by earth resources satellite of USA that Lop-Nur. which is known as a big ear shaped of in west China had dried up. Anyhow in the geological peroid. Lop-Nur was a big lake of 2X 10'km2, even before the 1958. It covered an area of 2 919 km2. In or-der to set up the Lop-Nur Nature Reserve. We went to Lop nor area for five times from 1995 to 1997. In the spring of 1996, we reached Loulan Ancient city from the center of Lop-Nur and carried out the researches on the Lop-Nur and its environment.It...

In 1972. It was discovered by earth resources satellite of USA that Lop-Nur. which is known as a big ear shaped of in west China had dried up. Anyhow in the geological peroid. Lop-Nur was a big lake of 2X 10'km2, even before the 1958. It covered an area of 2 919 km2. In or-der to set up the Lop-Nur Nature Reserve. We went to Lop nor area for five times from 1995 to 1997. In the spring of 1996, we reached Loulan Ancient city from the center of Lop-Nur and carried out the researches on the Lop-Nur and its environment.It was found that in historical period. Lop-Nur has become rich in water, and then with-ered, even dried up for many times. But In modern times, it was not a wandering lake but the salt converging depression of Tarim Basin. As for this point a large area of deep salt rock precip-itated at the center of former Lop-Nur. Tarim River has Changed its route for many times, but it only resulted in the changes in shape of water-surface at the mouth of Tarim River.The area of Lop-Nur has withered for many times, which was related to the development of agriculture in history. About 1400 a BP. and evident withering took place, which was resulted from the route change of Tarim River and cause the ruin of Loulan Ancient city. The drying-up of Lop-Nur in mordern times is the outcome of human influence.In satellite image, there are six evident traces in ancient Lop-Nur and four traces after 1921 can be seen.In consideration of arid climate and human economic development in Tarim Basin the situa-tion of drying-up and desertification can not be changed.

1972年美国地球资源卫星发现“中国西部的大耳朵”罗布泊干涸了,但在地质历史时期罗布泊曾是2×10~4km~2的大湖,在1958年前还曾有2919km~2。历史上罗布泊有过多次丰水和萎缩干涸的历史,但在近万年来它毕竟是塔里木盆地盐分最终的积聚洼地,而不是游移湖,古湖心沉淀的大面积厚岩盐层就是明证(聚集盐50亿t~80亿t)。塔里木河虽多次改道,只是引起入湖口水面形状的变化。罗布泊面积多次萎缩,与历史上农垦事业发展相关,1400年前明显萎缩,为河流自然改道所致,同时引起楼兰古城衰亡。近代罗布泊干涸,是人类影响的结果。从卫星象片分析,古罗布泊有6条明显的萎缩影痕,1921年以后的近代罗布泊有4条萎缩影痕,与以上原因相对应。鉴于目前塔里木盆地干旱气候条件和人类经济发展状况,罗布泊干涸和湖周荒漠化的状况不会改变。

 
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