upstream water level

基本解释

At the same time, by the upstream water level raising, The water area and wind wave of the reservoir have increased.
同时，枢纽上游水位的提升也增加了库区的水面宽度和水域面积，致使库区风浪规模扩大；
With the upstream water level reducing and the downstream water level increasing, the highest tangent velocity also moving to the pipe center.
随上游水位的降低及下游水位的升高，切向流速最大值点也不断向管中心一侧移动。
The bigger the downstream water level, the outstanding of variation degree of axial velocity along radius distribution when upstream water level is same.
下游水位越高，变化相同的上游水位时，轴向流速沿径向分布的变化程度越大。