Water surface profile and velocity field of flow in flume are measured by manometer tube and propeller current meter respectively .

首先进行了单丁坝水槽实验，采用 测压管和旋浆流速仪对实验水槽中水流的 水位以及流速场进行了详细的测量。

A sufficient flow of gas to produce clear difference of water level in the three manometer legs can be generated by blowing through the tube .

当有足够的气体流入时， 即可 发现三条管中之 液体产生不同高度的变化。