渐变流 meaning in English

gradually varied flow
gradually varied unsteady flow

In this paper , we study the most serious damming section of the east - one main canal , which is from the entrance of the hao wan flume ( chainage12 + 123 . 6 ) to the exit of shang tian yuan tunnel ( chainage24 + 091 . 1 ) . the main content is analyzing the flow characteristic of the canal , setting up mathematical model of the discharge condition of the east - one main canal , according to the survey section and actual roughness factors , building , bend and so on , we divided the canal into more than loocaculation segments . each segment is calculated by microsoft excel electrical table through computer as permanent transition flow of non - prismatic channel
本论文研究的渠段为陆浑灌区东一干渠壅水最为严重的渠段，从郝湾渡槽进口(桩号12 + 123 . 6 )至上天院隧洞出口(桩号24 + 091 . 1 ) ，其主要内容是，分析渠道水流特征，建立东一干渠输水状况的数学模型，根据测量断面及实际糙率、建筑物、弯道等因素的不同，将渠道划分成120多个计算段，每段按非棱柱体恒定渐变流，运用microsoftexcel电子表格进行编程计算。