变水头 meaning in Chinese

varying head

Falling head permeability test
变水头渗透试验
Falling head permeability
变水头试验
The content of the research includes the commonly optimal power flow problems , thermal optimal power flow problems and hydro - thermal optimal power flow problems in power system
研究内容包括电力系统最优潮流的一般问题、纯火电力系统最优潮流以及含固定水头水电厂、变水头水电厂和梯级水电厂的水火电力系统最优潮流等等问题。
In order to understand the characteristics and mechanism of flow washout for the crevice of core wall in earth - rock dam , according to the exemple of crack washout test for the core of heihe dam , constant water level washout test and changing water level washout test are adopted differently , the process of test and the character of the flow washout for the core crack are gone into particulars
摘要为了解水流冲刷作用下反滤层对土石坝心墙裂缝发展保护作用的特点和机理，以黑河土石坝心墙裂缝冲刷试验为例，分别采用常水头和变水头两种方法，探讨了土石坝心墙裂缝在水流冲刷过程中的特点。