Study On The Real-time Simulation And Visualization Of Offshore Oil Spill In Marine Search And Rescue Simulator

The training using the Marine Search and Rescue Simulator can enhance the flexibility and the collaborative ability of each maritime department while searching and rescuing, it also can improve the emergency pre-scheme, search and rescue plan, computer-aided SAR decision-making support system, evaluation system of SAR established by each level Rescue Coordination Center. The simulation and 3D visualization in real-time of the oil spill on the sea is an important component of Marine Search and Rescue Simulator.On the basis of researching tidal current numerical simulation and oil spill prediction, the simulation and 3D visualization of oil spill are realized in real-time by using C++Language under the Visual Studio 2005 and Open Scene Graph 2.8 in this dissertation. The primary research contents and contributions of this dissertation are summarized as follows:1. A numerical calculation method for the mathematical model of tidal current is proposed. The 2D tidal hydrodynamic models simplified from 3D models exactly show the tidal characters of coast area. By studing present tidal current numerical calculation algorithms, a simplified 2D model is adopted to simulate tidal current in selected coast area firstly. Then, an alternating direction implicit method is used to discrete the 2D model. Finally, the tidal velocity of each point is obtained by tidal current numerical calculation.2. Offshore oil spill dynamic simulation is realized in real-time. Research of oil spill based on present mathematical models, the calculations of oil spread, drift, evaporation and emulsification models are realized, and the oil movement parameters are obtained. From the beginning of spill to the breaking of oil, the FAY spread model is adopted to simulate the spread course of oil, and drift, evaporation and emulsification models are adopted in whole movement course of oil.3. A new 3D visualization algorithm of oil spill is proposed. On the basis of studing the realistic rendering algorithm of ocean wave, a 3D visualization method of oil spill is proposed after analyzing the related theory and technology. Using the Rendering to Texture technique of OSG, a dynamic texture of oil spill trajectory is generated. Then, using the technique of Planar Refraction Map, the dynamic texture is projected to ocean surface in fragment shader. When search and rescue ships come, after deploying oil containment booms, a collision detection algorithm is used to realize the 3D visualization of intercepting scene. The 3D visualization scenes include oil being intercepted by the containment booms and it moving along an island. The 3D visualization results of these scenes are satisfying.