| Popis: |
The paper describes a range‐dependent propagation model based on a combination of range‐dependent ray tracing and plane‐wave bottom responses. The ray‐tracing module of the model determines all the eigenrays between any source/receiver pairs and stores the ray histories. The received wave field is then synthesized by adding the contributions of all the eigenrays, taking into account the reflections from the bottom and the surface. The model can treat arbitrarily varying bottom topography and a layered elastic bottom as long as the layers are parallel. In the current version, the bottom is modeled with a sedimentary layer over an elastic half space, but more complicated structures are easily implemented. The new model has been tested against other models on several benchmark problems and also applied in the analysis and modeling of up‐slope and down‐slope propagation data recorded on a 52‐element center‐tapered array that was deployed at two locations about 70 miles east of Jacksonville, FL. The paper presents the results of these tests with an assessment of the potential use in connection with geo‐acoustic inversion of range‐dependent and elastic scenarios. [Work supported by Applied Research Laboratories, The University of Texas.] |
