地下に設けられる跳水式減勢工の発生音特性

抄録

We used a hydraulic model test to study the mechanism that creates sound when a hydraulic jump-type energy dissipater is set underground. The test was performed using four types of models with different sizes and similar in shape and the factors ruling the generation of sound was studied. We evaluated the characteristics of the frequencies and the relation between acoustic power and hydraulic conditions. We also assessed the characteristics of sound circulation in an underground space and found that it can be explained by way of air column resonance. In addition, we made a basic study of the effectiveness of an acoustic filter in reducing resonance.