The WKBZ approximation with the surface phace-shift correction is used to compute mode eigenfunctions, which has advantages of concise form and easy calculation. On the basis of the WKBZ eigenfunction, a mode approach...The WKBZ approximation with the surface phace-shift correction is used to compute mode eigenfunctions, which has advantages of concise form and easy calculation. On the basis of the WKBZ eigenfunction, a mode approach is proposed. This approach has been applied to sound propagation in the North Pacific, and a great number of numerical examples are given. The results show that the WKBZ mode approach is a fast and accurate numerical method to calculate the acoustic field of convergence zones in stratified ocean channels.展开更多
The two-axis underwater channel often exists in deep ocean. Sound propagation in the two-axis underwater channel is a benchmark problem for computational methods of underwater acoustics. In this paper, the generalized...The two-axis underwater channel often exists in deep ocean. Sound propagation in the two-axis underwater channel is a benchmark problem for computational methods of underwater acoustics. In this paper, the generalized phase-integral (WKBZ) normal mo de approach is extended to deal with this kind of problem. Numerical results show that the extended WKBZ approach is effective.展开更多
In this paper, the reverberation loss is taken as a normalized physical quantity to describe the shallow-water reverberation, and reverberation loss versus time was calculated by using three models: the ray-based mode...In this paper, the reverberation loss is taken as a normalized physical quantity to describe the shallow-water reverberation, and reverberation loss versus time was calculated by using three models: the ray-based model, the WKBZ mode models taking and not taking the effects of complex eigenvalues into account. Numerical simulations show that the effects of complex eigenvalues can not be neglected, and at medium ranges the reverberation loss from the ray-based model is consistent with that from the WKBZ mode model taking the effects of complex eigenvalues into account.The experimental results show that the reverberation loss is not dependent on the bandwidth. The reverberation in shallow water with a thermocline shows strongdepth dependence, and the theorctical geometricmean rule of reverberation intensity was demonstrated by experiment.展开更多
文摘The WKBZ approximation with the surface phace-shift correction is used to compute mode eigenfunctions, which has advantages of concise form and easy calculation. On the basis of the WKBZ eigenfunction, a mode approach is proposed. This approach has been applied to sound propagation in the North Pacific, and a great number of numerical examples are given. The results show that the WKBZ mode approach is a fast and accurate numerical method to calculate the acoustic field of convergence zones in stratified ocean channels.
文摘The two-axis underwater channel often exists in deep ocean. Sound propagation in the two-axis underwater channel is a benchmark problem for computational methods of underwater acoustics. In this paper, the generalized phase-integral (WKBZ) normal mo de approach is extended to deal with this kind of problem. Numerical results show that the extended WKBZ approach is effective.
文摘In this paper, the reverberation loss is taken as a normalized physical quantity to describe the shallow-water reverberation, and reverberation loss versus time was calculated by using three models: the ray-based model, the WKBZ mode models taking and not taking the effects of complex eigenvalues into account. Numerical simulations show that the effects of complex eigenvalues can not be neglected, and at medium ranges the reverberation loss from the ray-based model is consistent with that from the WKBZ mode model taking the effects of complex eigenvalues into account.The experimental results show that the reverberation loss is not dependent on the bandwidth. The reverberation in shallow water with a thermocline shows strongdepth dependence, and the theorctical geometricmean rule of reverberation intensity was demonstrated by experiment.
