Abstract: During the processing of ocean ambient noise near the ship channel of Qingdao, it was found that when passing ships were present near the hydrophone pair, the originally almost constant noise coherence stripes over a period exhibited asymmetric bending. Within a continuous measurement period of 35 hours, the bending pattern of the coherence stripes changed three times. In order to explain this experimental phenomenon, this paper simulates the coherogram when the ship passed by based on the noise model near the shallow water channel. When simulating the noise vertical coherence according to the preset parameters of the hydrophone pair, the simulation results could not explain the experimental phenomenon. By comparing the depth data measured by the temperature-depth recorder with the times when the measured coherence abruptly changed, it was speculated that the hydrophone pair tilted due to two external forces. Under the assumption of the tilted array, by utilizing the noise model and real-time ship positions provided by the Automatic Identification System (AIS), simulations of the coherogram of the noise from three measured ships at different time periods were achieved, explaining the three types of bending phenomena in the measured coherogram and the abrupt changes in noise coherence. The research approach in this paper can provide technical support for explaining abnormal noise phenomena and estimating changes in array and waveguide parameters based on noise coherence.