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1·He jump into the water head over heels.

他头向下地跳进水里。

2·The type of flow would affect the calculation of water head losses.

管内流态的变化会影响水头损失的计算。

3·It is also part of the watertight envelope, and subject to the local water head.

它也是水密外壳的组成部分，并承受局部水压力。

4·Higher water head closure has become a trend with the development of river way closure.

从河道截流的发展趋势来看，高水头截流已成为一种趋势。

5·The method disturbs the flow pattern relatively less and the water head loses in small.

此补强方法对水流流态干扰较少， 水头损失小。

6·Generating according to constant water head could improve the hydropower plant's economy benefit.

恒水头发电能使单位体积的水发出更多的电能，从而提高水电厂的经济效益。

7·When the system is confined well, the change of observation water level has a linear relation with water head change.

在系统封闭很好的情况下，观测水位的变化基本与水头的变化呈线性关系。

8·The turbine for the Three Gorges Project is one of the mixed-flow turbines with great changes of operation water head.

三峡电站水轮机是运行水头变幅最大的混流式水轮机之一，其外形尺寸和重量亦是当前混流式水轮机之最。

9·Actually, in the tube engineering, the proportion of the loss of local water head in the loss of pipeline water head is big.

在实际管道工程中，阀门阀道的局部水头损失占管路水头损失的比例是相当大的。

10·Because of the high water head and high flow speed, the aeration for preventing cavitation erosion becomes more and more important.

由于水头高，流速大，明流泄洪洞的掺气减蚀越来越受到重视。

水头

1·These phenomenon jeopardize the condition of the project seriously, and it is the main factor that influences the loss of local water head.

这些现象严重危害管道的工况，并且是影响阀道局部水头损失的主要因素。

2·The effect of practice showed that the seepage prevention wall is beneficial to reducing the seepage water head, decreasing the seepage line inside dike and escape gradient.

实际应用显示钢板桩的实施有利于减小渗流水头、降低堤身浸润线和出逸比降。

3·Calculation formula of velocity distribution, boundary layer thickness, friction force and loss of water head are given out, in accordance with the result from theory analysis of similitude solution.

对于速度边界层提出了相似性解的解析结果，给出了速度分布、边界层厚度、摩擦阻力和水头损失的解析计算表达式。

4·Higher water head closure has become a trend with the development of river way closure.

从河道截流的发展趋势来看，高水头截流已成为一种趋势。

5·The uncertainty of the parameters may induce uncertainty calculation of water head and velocity of flow, and influence the reliability of the results of groundwater resources appraising.

参数的不确定性将导致计算的水头、流速的不确定性，并影响到地下水资源评价结果的可靠性。