| Abstract: | Bathymetry with remote sensing image has the advantages of easy access, low cost and large coverage, which is one of the hot research issues at present. In order to further consider the influence of diffraction and nonlinearity on the basis of wave refraction, a nearshore depth inversion model based on wave number and wave height is proposed in this paper. The comparison with Berkhoff elliptic shoal ideal experiment, the average error is 0.13% , which is significantly smaller than the existing methods based on dispersion relationship. The model is further applied to retrieve the nearshore topography of Sanya Bay, the average error is 11.58%, and the error is less than 10% in most areas by comparing with the chart. Large error in some regions is mainly due to the low spatial resolution and accuracy of wavenumber obtained from remote sensing images. The above results show that the model can accurately calculate the nearshore water depth by using remote sensing ocean wave information. And this study will have a certain reference value for water depth inversion in the nearshore shallow water area. |
