中文摘要：

宽尾墩、窄缝挑坎收缩式消能工应用于高拱坝表孔、深孔后，可获得多股窄长射流交错入射水垫塘，实现高拱坝坝身下泄多股水流无碰撞消能。但各股窄长水流间的间距如何影响其消能效果有待进一步研究。采用模型试验的方法在1∶400水工模型上，研究了射流水股间横向间距对水垫塘水力特性的影响。研究结果表明：随着窄长射流横向间距的减小，射流相互干扰掺混，冲击动压的压力峰形态由多峰合并为单峰，冲击动压值增大；冲击动压值随上游水深的增加而增大，随下游水深的增加而减小。

英文摘要：

Without impact happened to the multi-strand elongated jet impinging into plunge pool is attained by applying the flaring piers and slit-type bucket respectively,achieving multi-jet discharged without collision to high arch dissipate energy. However,the effect of the spacing between each strand elongated jet on its energy dissipation needs further study. In this paper,the effect of the lateral spacing between each jet on the hydraulic characteristics in the plunge pool was studied experimentally on the hydraulic model 1：400. The results show that with the lateral spacing of elongated jet reducing,the jet mixes with each other,the pressure peaks form of the impact pressure combines into a single peak and the impact pressure increases. With the upstream water level increasing,the impact pressure increases. While,the deeper the depth of downstream water cushion is,the smaller impact pressure will be.