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。
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。
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。
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。
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。
Hydraulics in water releasing structures with high water head and large discharge capability has been paid close attention recently.
高水头、大泄量的泄水建筑物水力学问题是水利工程建设中特别受关注的问题之一。
Based on the study in the water head area in Changle County, the paper emphasize the significance of protecting the water head area.
在实地考察昌乐县水源地现状的基础上，提出该县水源地保护的意义。
By comparing the calculated water head, shaft power and efficiency with the experimental results, the method was proved to he feasible.
计算了泵的扬程、轴功率和效率，并与试验进行了对比，验证了计算方法的可行性。
Due to the high water head of the GHS, the design unit put forward a suggestion of using the pre stressed reinforced concrete spiral case.
高坝洲水电站由于设计水头较高，设计单位建议采用预应力钢筋混凝土蜗壳。
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。
A mathematical model whose variable is water head can simulate the effects of water head and properties of subsurface irrigation pipe on irrigation.
以压力水头为因变量的数学模型可以模拟供水压力和灌水器特性对灌溉效果的影响。
A check valve (3) can prevent the natural chemical absorption water head of the water head when the manual pump or the mechanical pump stops to work.
止回阀(3)起当手压或机械泵停止工作时能阻止水位差的自然吸药。
Finally, some other characteristics of the variable water head standard device for large flow rate have been dealt with and theoretically investigated.
本文对使用的方法进行了初步探讨，并讨论了变水头大流量标准装置的一些其它特性。
With the model, many parameters can be obtained such as water head, equivalent mechanical fissure width, seepage coefficient, and hydraulic gradient etc.
应用该模型可计算出二维裂隙网络中任意交点（内结点）的水头、等效水力隙宽、渗透系数、水力梯度等参数。
However, it is very unpopular for this kind of bifurcation to be laid above the ground surface, especially in the case of large diameter and high water head.
但布置在地面上的明式月牙肋钢岔管尚不多见，特别是当钢岔管承受的水头和直径较大时。
The hydraulic turbine unit frequently operates under the low water head, exists the questions of unstable operation and cavitation in Mania hydropower station.
满拉水电站水比机组经常处在低负荷下运行，存在着局部空蚀破坏和运行不稳定两大问题。
An effective pre-drainage system in a limited area that has a high water head and huge inflow is important to prevent flooding accidents during subsea tunnelling.
一个有效的预排水系统在一个有限的区域内，有一个高水头，巨大的流入，重要的是要防止水浸事故发生的海底隧道。
The process and result of the experiment shows in the scheme the assumption of water head diversion by 50% and water-saving rate by 50% is feasible and practical.
试验过程及结果表明，该方案削减船闸工作水头约50%，船舶一次过闸省水率约50%的设想是可行的，合乎实际的。
Gradation of sand column and sediment concentration of muddy water and water head are remarkably effective factors for the fine grain distribution in sand column.
砂柱的颗粒组成、水含沙量和入渗水头对滞留分布产生显著的影响。
In the process of making optimal load dispatch plan in hydroelectric plants, it is usually supposed that the water head of the hydroelectric plant is not changing.
在水电站制定厂内机组最优负荷分配时一般都假设水电站的水头是不变的。
In design of pumped storage station or high water head hydro-power station, it is important to evaluate the rock infiltration properties under practical water pressure.
在高水头电站、抽水蓄能电站设计中，需要查明岩体在实际水头作用下的透水率、渗透特性。
In water conservancy and hydropower projects ot plain, the large quantities of small power station of low water head and large discharge have been built in our country.
在平原地区水利水电工程中，我国建造了一大批低水头、大流量的小型水电站。
The stability of a water cushion pool by the action of high water head and large flood-discharge power is one of the key technologies which relate to its safe operation.
高坝水头高、泄洪功率大，下游水垫塘的稳定性是其能否安全运用的关键性技术之一。
The time and spatial effects of excavation considering the variation of water head difference between the inside and the outside of a foundation pit were then investigated.
研究了考虑坑内外水头差变化时的基坑工程时间效应和空间效应，并与不考虑坑内外水头差变化的情况进行了对比。
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。
Though the range of water head is not too wide, maximum efficiency of Goupitan hydroelectric plant is very high and weighted efficiency focus on rated head wide range in flow.
尽管构皮滩电站的水头变幅并不大，但最高效率要求较高，而且设计水头附近横向权值大。
For high arch DAMS in valleys with the characteristics of high water head, large discharge and large power, the problems of energy dissipation and scour prevention are serious.
高拱坝泄洪消能的特点是坝高落差大，流量大，功率大，位于河谷狭窄地区，泄洪消能与防冲问题突出。
The influence of water temperature on water head height becomes bigger as the well depth increases. The pressure at the well bottom has to be measured by instruments in the well.
随着井深增加，水温对水头高度的影响越来越大，需要采用下井仪器测量井底压力。
Protection design for lower reaches of the Yellow River was once a difficult question due to high water head, various combinations of discharging structures, and complex flow pattern.
小浪底工程由于水头高、泄水建筑物组合多，水流流态十分复杂，下游防护设计是一难题。
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。
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