Loading...
Please wait, while we are loading the content...
Matching Modal Arrivals in Shallow Water for Tomographic Inversions
| Content Provider | Semantic Scholar |
|---|---|
| Author | Taroudakis, Michael I. Markaki, Mairi Mavritsaki, Eirini |
| Copyright Year | 2006 |
| Abstract | The paper is referred to the problem of estimating water and/or bottom parameters in shallow water, using a single receiver and measurements of the acoustic signal due to a known source in the time domain. As it is very difficult in shallow water to identify ray arrivals, our analysis is based on the assumption that alternative observables and specifically modal arrivals are identified. The success of modal arrival identification is also the criterion for the estimation of a solution to the inverse problem. In particular, mode identification is based on an optimisation scheme according to which we seek among a wide search space, the environment which provides the least L2 norm on the travel time differences between the modes of the measured and the replica signal corresponding to a candidate environment. To this end, an identification routine based on the calculation of the group velocities of the candidate environment is utilised. As the search algorithm is based on the minimisation of the travel time differences only, the results of the inversion procedure is in fact an environment considered very close to the actual one but not necessarily the actual environment itself. This estimation is however particularly useful when a linear inversion scheme or a detailed local search for fine-tuning the results is to be applied as the starting point of both algorithms should be an environment close to the actual one. Results of this inversion approach with a simulated shallow water benchmark environment are presented and discussed. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://users.math.uoc.gr/~taroud/paper.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
