Research On Visual Simulation Method Of Nearshore Waters Based On Optical Properties

With the development of visual simulation technology in recent years,digital ocean has gradually become a research hotspot.However,the current water simulation methods focus more on the simulation of water surface waves and illumination in the open ocean,for water color and underwater optical environment,it is mainly based on simple rendering,which is not suitable for simulating nearshore with complex water quality conditions and optical characteristics waters.In view of the above problems,based on the optical characteristics of real nearshore waters,this thesis studies the color simulation and illumination simulation model construction methods for this specific type of water.First of all,in order to solve the problems of low accuracy,lack of real-time and underwater effects of the current method for color simulation in nearshore waters,this thesis starts from the microscopic formation mechanism of water color,introduces the bio-optical model in the field of hydrology,and completes the process based on the actual nearshore.Based on the inherent optical model characteristics of the water quality environment in the water area,a parametric simulation equation of water quality and water color that can be solved in real time is proposed.The method extends the applicable range of the equation to whole water space,and establishes an all-round real-time color simulation model for nearshore waters.Experiments have verified that the model can not only accurately simulate the color value of the water surface and any point underwater according to the water quality components of the real nearshore waters,but also add realistic color gradation changes to the simulated water space.Secondly,in order to further reduce the color difference between the simulated water area and the real water area,considering the color uniformity of the underwater simulation environment,this thesis proposes an underwater color difference correction method that combines the GPGPU technology and the Reinhard algorithm,which takes real underwater captured images as input,and can transfer the color texture of captured images to continuous screen frames when the observation viewpoint enters underwater.Experiments results have verified that this method can transfer the real water color to the simulated underwater environment in real time,and ensure the color consistency effectively between them.Then,in order to solve the problem that the lighting effect of the scene in the simulated water body is not comprehensive enough and enhance the realism of the overall nearshore waters visual environments,this thesis studies the real-time modeling methods of multiple water body interactive lighting based on the lighting effect in the real water environment,by selecting,improving and integrating each single water area illumination simulation algorithm,a comprehensive real-time simulation model of water area interactive illumination is established.Experiments have verified that the established model can provide comprehensive real-time dynamic lighting simulation effects for nearshore waters.Finally,based on the above work,this thesis proposes an all-round real-time visual simulation model for nearshore waters,and combines the Unity3 D engine to complete the systematic integration and performance verification of the method.The results show that compared with other studies,the simulation effect of this thesis on the underwater visualization environment of coastal waters is more realistic,and it can simulate the eutrophication phenomena such as color shift and turbidity that are unique to the open ocean waters,which comprehensively improves the specific eutrophication.The visual immersion of the nearshore water provides a reference for the real reproduction of various near-shore water environments in China.