然后求出了丁坝问题的摄动解。
The asymptotic solutions to the problem of a spur dike are obtained.
湖岸整治工程多用平顺护岸必要时也可采用短丁坝护岸。
The renovation project with smooth revetment when necessary can also adopt a short spur dike revetment.
本文对洪水条件丁坝近体的局部冲淤进行了三维数值模拟。
Local scour and deposition around submerged spur dike was numerically simulated in the present paper.
在分析基础上，提出了漫水丁坝坝头床沙起冲流速的计算办法。
Then, the calculating method of initial scour velocity of bed sand around submerged spur dikes is suggested.
丁坝(群)附近的局部流场变化是引起丁坝局部冲刷的根本原因。
Local directional change of the flow field in the vicinity of spur dike would result in local scouring of spur dike.
实验研究包括单丁坝及双丁坝条件下丁坝影响区内流场及水面变化规律；
Experimental study includes the law of flow field variation and variation of water surface in affected zone by the single groyne or twin-groyne.
涌潮压力在垂线方向上的分布。为排桩式丁坝的设计提出了新型的受力模式。
The distribution of the bore pressure along vertical space which is a new type loading mode for the design of pile-groin.
目前，国内外的护岸建筑物主要有丁坝、导流板、导流屏、导流坎、导流栅等。
Currently, the main protection buildings are spur-dike, diversion board, diversion screen and diversion hum, diversion barriers.
试验结果表明，在深水区的单侧丁坝群对宽浅河床地形的调整作用大于浅水区；
Test results show that spur dikes aligned along a single bank in the deep water zone have more effects on the adjustment of the bed topography of the wide-shallow river than in the shallow water zone;
作为一种新型河工建筑物，桩柱透水丁坝对局部水流的影响亟需可靠的定量研究。
As a new fashion river regulation building, it is necessary to research the effect of pile permeable groins to local flow quantitatively.
本文通过现场观测，分析了桩式丁坝的护滩保塘效果，探究丁坝护滩保塘的机理。
The mechanism of the effect on protecting dykes and flats in tidal estuary is analyzed.
结合试验资料，应用因次分析方法及动量方程，导得了对不同间距的淹没丁坝群的壅水计算式。
By using above formulae the backwater for equal - interval and unequal - interval submerged dikes can be obtain.
桩式丁坝新工艺、新技术在强涌潮作用的海宁段海塘塘脚的成功应用，使海塘建设技术有新的突破。
The new technology of t, shaped dike made with piles was successfully used in the strong tide region in Haining country, that is a breakthrough of seawall construction technology.
局部绕流冲刷是丁坝和桥墩等水工建筑物周围常见的水力现象，是造成该类工程破坏的重要原因之一。
Local scour is a common occurrence around hydraulic structures like spur-dikes and bridge foundations. This affair is a main reason of failure of bank protections and Bridges.
结果表明绕丁坝的近场流动具有强三维非恒定特性，表现在坝后振荡回流区的形成和坝顶表面波的生成。
The observed information shows that the flow is three dimensional and unsteady due to the fluctuating circulation zone and surface wave.
研究丁坝对水流的影响规律以及丁坝附近水流的流动结构对于航道整治建筑物的设计具有十分重要的意义。
It is of great importance for the design of channel regulation structure to explore the effect of spur dikes on flow, and to study the flow structure near the spur dike.
本文介绍了用颜料示踪和最新的油膜技术对流动进行可视化记录以研究淹没丁坝群的近体流场分布的试验结果。
The dye injection and oil-film method together with electromagnetic velocimeter are applied to measure the flow field around spur dikes.
丁坝冲深极限值是确定建筑物基础埋设深度的一个主要因素，丁坝设计和施工中的关键问题在于确定坝头最大冲深。
The scour limit depth around spur dikes is very important for calculating the base depth of objects and it is a key factor in designing and working.
丁坝是河道及航道整治工程中一种常用的重要建筑物，具有控制河势、保护岸滩、束水攻沙及壅高水位等多种功能。
The spur-dike is a common important building which is usually used in river course improvement projects, controlling river trend, bend protection, beam attack sand and high water levels.
试验的三种透水率桩坝，其导流效果与实体丁坝群的基本相同，并未因部分透水及形态不同而使其控导作用明显减弱。
Three kinds of permeable pile dikes with different seepage rate are tested, and effect of flow control is basically the same with the spur dike,.
试验的三种透水率桩坝，其导流效果与实体丁坝群的基本相同，并未因部分透水及形态不同而使其控导作用明显减弱。
Three kinds of permeable pile dikes with different seepage rate are tested, and effect of flow control is basically the same with the spur dike.
应用水力学基本原理，探讨了在丁坝影响下支汊分流比的计算，得到(12)式，由(12)式计算的支汉分流比与实测值基本吻合。
The calculation of branch diversion was explored in the condition with a dike, and the equation (12) was given, by using basic theory of hydraulics.
基于RNG紊流模型，采用VOF法、空度法和璧面函数法分别处理自由面、不规则边界和壁边界，对丁坝附近的水流进行了模拟和研究。
RNG turbulent model combining with VOF method, porosity method and wall function was used to simulate and research the flow around a spur-dike.
为了验证井柱桩透水丁坝的分水缓流作用效果，建立单排井柱桩透水丁坝运行时的水量平衡方程，导出了单排井柱桩透水丁坝上下游流速公式。
In order to prove water diversion and retarding action effect of permeable pile groins, the flow velocity formulas above and below the permeable pile groins are derived respectively.
利用三维超声学多普勒流速仪对丁坝坝头附近水流和回流区水流的紊动特性进行了系统的观测和分析，得到了丁坝坝头和回流区的水流特性及紊动动能的分布规律。
Then the turbulence characteristics of the spur dike head and backflow region and the distributions law of flow and turbulence kinetic energy around spur dike are obtained in this paper.
本文根据丁坝作用后水槽中水流情况，采用动量方程结合试验资料，导出了丁坝下游主槽平均流速沿程变化的公式，以此为基础，提出了丁坝作用下河床冲刷段长度的计算公式。
According to the flow state in flume for spur and experimental data, the formulas for the mean velocity of main channel varying with distance downstream were derived with momentum principle.
本文根据丁坝作用后水槽中水流情况，采用动量方程结合试验资料，导出了丁坝下游主槽平均流速沿程变化的公式，以此为基础，提出了丁坝作用下河床冲刷段长度的计算公式。
According to the flow state in flume for spur and experimental data, the formulas for the mean velocity of main channel varying with distance downstream were derived with momentum principle.
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