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Outline
The marine exploration environment is generally regarded as a fluid-solid boundary coupling medium. High-precision imaging of the fluid-solid boundary coupling medium can be achieved by using the decoupled elastic wave field for reverse-time migration. Traditional elastic wave decoupling utilizes the Helmholtz principle, but the separated P-waves and S-waves have phase and amplitude issues, which seriously affect the final imaging quality. This paper starts from the first-order velocity-stress elastic medium wave equation, separates the full elastic wave field into pure P-waves and pure S-waves to construct a new coupling equation, avoiding the phase and amplitude problems and crosstalk artifacts caused by the traditional Helmholtz decomposition; analyzes the displacement and stress continuity conditions at the boundary of the fluid-solid boundary coupling medium, and establishes the acoustic-elastic coupling vector separation equation; compares the numerical simulation results with the acoustic wave equation to verify the effectiveness and accuracy of the proposed acoustic-elastic coupling vector separation equation forward modeling method, and compares the results with the conventional reverse-time migration imaging method in a complex seabed model to verify the reliability of the reverse-time migration imaging results.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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