水面比降 meaning in Chinese

slope of water surface
surface slope
water surface gradient

Test results show that the water surface slope , velocity and ratio of water depth to draft are the main influencing factors of ships ascending rapids
试验结果表明，滩段的水面比降、水流速度及船舶水深吃水比是船舶上滩的主要影响因素。
It shows that the water level in the definite reach is lower than that with same discharges before dredging river , the surface slope on upper reaches dredged is enlarged and deposition load on bed is reduced or eroded
主要表现在可以引起一定范围河段内的水位较挖河前同流量下有所降低，开挖上游河段水面比降增大，床面淤积量有所减少或发生冲刷。
Considering the joint operation of the three gorges and gezhouba hydropower stations , influences of the daily regulation planning of the hydropower stations on the water surface slope of the downstream reach of the three gorges reservoir are studied
?结合三峡和葛洲坝两电站联合运行的实际情况，研究了调节方案对三峡水库下游河道水面比降的影响。