通过对三峡泄洪深孔明槽段体型试验研究，比较了明槽段不同抛物线型的压力特性和空化特性，并提出了明槽段陡槽方案。研究结果表明:陡槽方案较之抛物线方案，压力特性和水流空化特性有显著改善。陡槽方案是免空化的，而抛物线方案较难达到免除空化;并且陡槽方案对有压段压力及空化特性，以及泄流能力均没有影响。因此，对于高速水流条件下的明 槽段体型，陡槽方案是一种较为适宜的布置形式

Through model test of TGP's floodreleasing deep outlet,the characteristics of pressure distribution and cavitation are compared among different types of parabolic profile,and a chute type is put forward.The research results indicate that,in comparison with the parabolic type,the chute type's pressure and cavitation characteristics are evidently improved.The chute type is cavitationfree,but the parabolic type is difficult to avoid cavitation.The chute scheme doesn't induce any negative influences to the discharge capacity and characteristics of pressure and cavitation in the outlet'spressure section.Therefore , the chute type is a feasible type for the open channel under high velocity flow.