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本研究在常压和减压不同的环境压力下，研究了水垫塘内水流的流态特征、入水射流对水垫塘底板的冲击压力和脉动压力强度以及拱坝下游坝面的紊流脉动压力强度的特性，给出了不同环境压力下动水冲击压力的沿程分布、脉动压力强度沿程分布以及空间相关曲线．由试验成果发现，减压使水垫塘内水流流态及水力要素均发生变化，本文就这一现象作了初步的讨论分析
In this study, under different ambient pressures, the effects of atmospheric pressure and pressure on the flow characteristics of the water flow in the plunge pool were studied. The impact pressure and fluctuating pressure on the plunge pool floor and the turbulent fluctuation pressure on the downstream dam surface Strength characteristics, the distribution of impact pressure of hydrodynamic pressure under different environmental pressures, the distribution of fluctuating pressure intensity and the spatial correlation curve are given. From the test results, it is found that the decompression causes the water flow in the plunge pool and the hydraulic factors to be changed. This article makes a preliminary discussion and analysis on this phenomenon