Abstract:This paper lists the applications and the flood discharge atomization of ski-jump energy dissipation and underflow energy dissipation in some hydropower stations. The Xiangjiaba hydropower station adopted multi-horizontal submerged jets pattern

in view of energy dissipation pattern of the station

and 17 physical parameters of the efficiency effects which influenced by energy dissipation pattern were analyzed. When only the surface outlets were operating in flood discharge

the flow pattern evolution was from free jet

semi-submerged jet

submerged jet to return underflow respectively; when only the middle outlets were operating

with the change of downstream water level

the bias flow appeared and then disappeared by the rise of the downstream water level

the spatial diffusion ratio was more obviously than the flow pattern evolution at the same time; when both the seven outlets and middle outlets were operating

the downstream water level had obvious effects on the flow pattern evolution

the contraction of surface outlets had obvious influence in the flow pattern evolution. Studies have shown that: flood discharge with surface outlets alone

the parameters influenced the maximum underflow velocity are elevation of drop-still in outlets and Froude number of flow; flood discharge with middle outlets alone

the parameters influenced the maximum underflow velocity are elevation of drop-still in outlet and drop-still bottom slope ratio; flood discharge with surface outlets and middle outlets

the parameters influenced the maximum underflow velocity are contraction ratio of surface outlets

side contraction ratio of surface outlets

height deviation of surface-middle outlets

Froude number of flow in surface-middle outlets and drop-still bottom slope ratio in middle outlets. This paper looks forward to the research prospects of energy dissipation in flood discharge of the high head

large flow and low atomization.