Research On Internal Wave Parameter Extraction With Optical Remote Sensing Image

There is a frequent occurrence observed in the South China Sea and the Luzon Strait is considered to be the source of the large internal solitary waves in the northern South China Sea.Internal solitary waves have a large amplitude and high flow rate,promoting matter and energy' transport.At the same time,These waves are important since they produce shear currents and turbulence that contribute to the global energy transport and dissipation in the world's oceans,and also due to their impacts on offshore engineering,biological activity,and military applications.Therefore,the study of internal waves has an important significance for offshore and marine engineering.Firstly,This paper carried out 3D simulation by using the MITgcm mode under the non-static conditions in Luzon Strait,gave a more accurate simulation of the internal solitary wave on the process of generation and propagation,analyzed three aspects from the sea elevation,sectional isotherm and amplitude,and found that internal solitary waves propagate independently of each other in the process,go forward respectivel.What's more,with the internal solitary wave propagation,energy bagin to dissipate and the depression scale of the internal solitary wave decreased gradually.Secondly,this paper established an optical image simulation model based on the simulation results,simulated WFV camera parameters of GF-1 satellite,obtained image feature internal waves which same as the features of the remote sensing images that shot with the WFV camera of GF-1 satellite,and the internal waves was dark light distribution in the remote sensing image.We compared the simulation results with the sea surface fluctuation,and found that they exhibit a negative correlation.Finally,we extracted the wave parameters from the combination of simulation results and the remote sensing images,including the internal wave propagation velocity and the amplitude.Analyzed the propagation velocity each time of the internal solitary wave generated by the simulation,and compared the propagation velocity with that of the solitary wave of the remote sensing images and found that the results were consistent.During the amplitude inversion,this article analyzed the simulation results from two perspectives of brightness spacing and brightness difference,and established the empirical relationship of the amplitude inversion,Moreover,we launched a verification instance in the northern South China Sea,verified the empirical relationship from the remote sensing images and experiments,and we get a better inversion results.