A Study Of Three-dimensional Modeling And Deep State Parameters Of Ocean Based On The Surface State Parameters

The real-time motion of large-scale ocean surface can be obtained by remote sensing technology.However,due to the rapid attenuation of electromagnetic waves in the sea,the data obtained by remote sensing measurement can only stay on the ocean surface.Obtaining the information of the internal motion state of the ocean can only be achieved through fixed-point observation,and cannot achieve the large area real-time monitoring.How to use the surface state parameter data to obtain the information of the internal state of the ocean is an urgent research content at present.To solve this problem,based on previous studies,this paper further studied the correlation between the ocean surface and the internal motion state,and constructs a three-dimensional numerical model of the ocean.Based on the relevant theories of ocean dynamics,the obtained remote sensing data of ocean surface were used as boundary conditions to carry out real-time inversion and distribution analysis of three-dimensional ocean motion state parameters in specific sea areas.The numerical results are compared with the measured data of the fixed-point monitoring equipment to verify the correctness and validity of the research results.The main contributions of this thesis are as follows:1)Learning the background knowledge of ocean dynamics,based on the real-time performance of the radar data,shore-based characteristics and related environmental parameters of a particular sea area,the normalized ocean basic governing equations are derived.2)Analyzing the common numerical calculation method,based on the principle of finite difference,a three-dimensional mesh model is constructed for calculating sea area,and the basic governing equations of the ocean are discretized on the three-dimensional mesh.The detailed discussion of the special boundary on the grid is carried out to construct a complete threedimensional numerical model of ocean current.3)The surface current information obtained by radar system is brought into the establishment ocean numerical model to obtain the deep current state distribution information and verify the rationality and validity of the model.The cubic spline interpolation is used to process the data and optimize the inversion results.4)According to the law of ocean kinematics and the specific inversion sea area,the water body is divided into zones and then stratified,and the three-dimensional numerical model is further refined to establish the variable-spacing grid model.Comparing the deep flow state information calculated by two models with the measured data,the optimization effect of the model is discussed according to the inversion results.