the flows can also be classified as either regime 1 or regime 2: the flows for JG 6 0.15 m/s are in regime 1 and those for JG P 0.25 m/s are in regime 2 because of the presence of huge bubbles. Hence the flow regime mainly depends on JG and the effect of H0 on it is not large. The formation of huge bubbles in regime 2 was also observed at z/DH $ 2