3 Hydrodynamics
249
(4) according to the classification of mass transport, there is transport wave
(tide wave, flood wave, etc.) and vibration wave. If there is a mass
transport (generating flow) in the average sense when the wave moves
forward, it is called a transport wave (as shown in Figs. 3.70, 3.71,
3.72). Otherwise, if there is no flow when the wave moves forward (the
average flow is zero), it is called vibration wave (as shown in Fig. 3.73).
Wind wave is a kind of vibration wave. Particles move in a circular way
without producing flow. In the vibration wave, according to whether the
wave shape has horizontal movement relative to the medium, it can be
divided into progressive wave and standing wave. Obviously, the horizontal motion of the wave is propulsion wave; the horizontal motion is
Fig. 3.70 Transport wave (tide wave)
Fig. 3.71 Ebb wave (different wave speed)
249
(4) according to the classification of mass transport, there is transport wave
(tide wave, flood wave, etc.) and vibration wave. If there is a mass
transport (generating flow) in the average sense when the wave moves
forward, it is called a transport wave (as shown in Figs. 3.70, 3.71,
3.72). Otherwise, if there is no flow when the wave moves forward (the
average flow is zero), it is called vibration wave (as shown in Fig. 3.73).
Wind wave is a kind of vibration wave. Particles move in a circular way
without producing flow. In the vibration wave, according to whether the
wave shape has horizontal movement relative to the medium, it can be
divided into progressive wave and standing wave. Obviously, the horizontal motion of the wave is propulsion wave; the horizontal motion is
Fig. 3.70 Transport wave (tide wave)
Fig. 3.71 Ebb wave (different wave speed)