Study On Extracting And Verifying The Internal Wave Parameters From SAR Images

摘要

Oceanic internal waves are often observed by SAR. So SAR provides a new technique for measuring internal wave in a large area. And it is complementary to tradi-tional measurements. The procedures are given in this paper for extracting the direction, wavelength, amplitude, speed and depth of internal waves. ENVISAT ASAR and Radarsat-2 SAR images of South China Sea are used to extract the parameters. And HJ-1 optical images are used to assist. Then some in-situ data from buoy is used to verifying the extrac-tion results. The times of in-situ data and SAR image are similar. The results are shown that: 1) The internal wave parameter can be extracted from SAR images, although sometime the extraction needs other data. 2) The error of wave direction between SAR and in-situ is less than 15 degree. The error of wave amplitude between SAR and in-situ is less than 15m, the relative error is less than 20%. 3) The wavelength of internal wave can’t be measured by buoy. The wave depth, measured by buoy, is the depth where the velocity of flow is maximum. It isn’t the depth of internal wave.