Shockwave Monitoring And Transmission Characteristics Analysis Of Underwater Explosion At Xiamen Harbor

With the exploitation of marine resources and the development of marine economy, underwater explosion have been widely used in underwater engineering. The underwater explosion will generate strong shock wave which affects aquatic life in a large range. People pay more and more attention to the serious effect on marine ecological environment generated by the shockwave. Xiamen harbor is the national nature reserve of marine mammal---Chinese White Dolphin. Since 2004, there have been 6 Chinese White Dolphins died in Xiamen sea area. It's presumed that underwater explosion shockwave maybe one of the immediate causes of death. It has significance to measure the shockwave peak pressure, analyze the energy propagation law of underwater explosion shockwave and monitor the underwater explosion.The paper focuses on data analysis of underwater explosion shock wave pressure acquisition from sea field. The characters of source level and propagation of underwater explosion shock wave are obtained.The main research contents are as follows:1. Introduces the history of underwater explosion research and the development of underwater explosion monitoring.2. Expatiates the characteristics of underwater explosion shockwave.3. Designs an underwater explosion shockwave acoustic monitoring system.4. Analyzes the recorded data of underwater explosion by software PULSE and Matlab, and analyzes several typical ambient noise of Xiamen harbor.5. Based on the recorded data of underwater explosion, we calculate the source level of different kinds of underwater explosion, and apply nonparametric tests of hypothesis to the comparison of underwater peak pressures from two kinds of underwater explosions; obtain the characteristics of underwater explosion shockwave at Xiamen harbor; estimate the underwater explosion safe distance.6. Discuss the tidal change factors'influence on the propagation of underwater shockwave. The innovation of the paper is that it concludes the attenuation the underwater explosion peak pressure with distance and estimates the underwater explosion safe distance and discusses the tidal change factors'influence on the propagation of underwater shockwave.