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Using the two-dimensional non-static numerical model, which neglect the submarine topography but consider the pycnocline and background shear flow, the numerical experiment was made on the generation and evolution of linear and nonlinear symmetric ocean internal waves in the unstable downward shear background flow. After analyzing and comparing the results, the main conclusions are as follows: the linear internal wave strength is exponentially growing with integral time, and there’s symmetric instability of the wave, while nonlinear internal wave strength is growing quasi-linearly in the development stage, and finally enters the stabilization stage. The linear growing is much faster than the nonlinear growing and the latter has a stabilizing effect. For linear and nonlinear symmetric internal waves, there are maximum value of potential density perturbation, which is captured by the pycnocline. This is consistent with actual observations. The stream function and potential density perturbation are well coordinated, which is reflected in the positive and negative centers of the potential density perturbation corresponding to the rising and sinking movements of the stream function, respectively. This shows that there is a slantwise convection occurred from the bottom of the sea and the pycnocline is the top cover. For linear internal waves, with the increase of integral time, its waveform is basically the same and the positive and negative amplitude is also about the same. There are two slantwise circulations that grow in opposite signs and between them is a strong slantwise upwelling. The waveform of nonlinear internal wave changes with the integration time and the number of slantwise circulations is also increasing, resulting in the stronger negative circulations and a sharp increase in the horizontal gradient of stream function and potential density perturbation. The sharp increase can be regarded as an interruption.
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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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