Shallow Water Bathymetry Surveys By SAR Based On M4S For Simulations Of Microwave Imaging Oceanic Surface

Based on synthetic aperture radar (SAR) shallow water bathymetry imaging mechanism and M4S for simulations of microwave imaging oceanic surface, the remote sensing study on shallow water bathymetry by SAR is presented. It mainly includes the study on the expression of shallow water bathymetry SAR images, statistical analysis of SAR shallow water bathymetry observations and SAR shallow water bathymetry surveys.Firstly, the progress on SAR shallow water bathymetry research and the basic principles of ocean remote sensing by SAR are reviewed, and the M4S for simulations of microwave imaging oceanic surface is also introduced.Simulation imaging model of SAR shallow water bathymetry has been developed based on SAR shallow water bathymetry imaging mechanism and M4S. The expression of shallow water bathymetry SAR images has been imprioved through the simulation study, shallow water bathymetry SAR images analysis and statistical analysis of SAR shallow water bathymetry observations.The favorable conditions of sea surface wind speeds and directions for SAR shallow water bathymetry imaging are also further illustrated based on both simulation study and statistical analysis. Meanwhile, the correlations betwween the SAR shallow water bathymetry temporal observations and the temporal surface wind speed and current speed are also explained.This thesis also gives the the parameters of sand wave in Taiwan shoal based on the statistical analysis of SAR shallow water bathymetry observations, such as the longtitudal and latitutdal distribution, the length of sand waves and the direction of the sand waves'feature.Last, both models for retrieving SAR shallow water bathymetry wind speed and SAR shallow water bathymetry current grads have been developed based on SAR shallowa water bathymetry imaging mechanism and M4S. Model for SAR shallow water bathymetry surveys is also developed according to the developed models for SAR shallow water bathymetry surveys and basen on above both models. The depths of sandwaves in Taiwan shoal are calculated, the results show that SAR is able to measure the shallow water bathymetry accurately. Meanwhile, as an add method for SAR shallow water bathymetry surveys, the wave refraction in near-shore water is also explored.