抄録
Two-dimensional coherent flow structure (2DCS) of shallow water jet was investigated by the laboratory experiments changing water depth and buoyancy of the outlet. Experiments with several water depth indicated that the shallower case tend to prompt 2DCS flow characterized complicated movement such as enlargement , unification , separation, etc. of plane eddies triggered at near the outlet of released jet. On the other hand, buoyant effects which were caused by the temperature difference between water temperature of outlet and ambient water were revealed to weaken the coherent flow structure. The effects of 2DCS and buoyancy against spreadings of the jets were also studied in detail and indicated that the spreading mechanism is different in the strong buoyancy condition and the buoyancy controls the 2DCS development.
