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研究我国海洋灾害应急管理体系的发展历程与现状,归纳我国海洋灾害应急管理体系的特点与存在的不足,从海洋灾害应急管理的体制、机制、法制及公众教育等方面提出完善我国海洋灾害应急管理的思路与对策措施。     

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?о????÷?????????????????????????????????????????????GPS???????????侫????????????????????????????????????????????????????30????????????????????????????????????R??T??N?????????0.032 m??0.084 m??0.078 m?????????????????0.18 ns???????????????????????????????????踴???????????????в???????????????????????????????????????????????????????????????о??н???????????     

Modeling and Simulation of Supercavity with Inertial Force in the Horizontal Curvilinear Motion简

To make a curvilinear motion in the horizontal plane is one of the most contents for realizing the maneuverability of the supercavitating vehicle. It is significant to achieve the controllability and maneuverability of the vehicle in three dimensions both theoretically and practically on research. Models of angle of attack, gravity and inertial force effects on the supercavity in the horizontal curvilinear motion are established, respectively. The supercavity is simulated based on these models in combination with Logvinovich model and the unsteady gas-leakage rate model at the given ventilation rate, and the effect of the inertial force on it is analyzed numerically. Results show that the maximum deviation of the center line of the cross section of supercavity towards the outward normal direction of its trajectory increases as the cavitation number or curvature radius decrease and always occur in the tail because of the increase of inertial effects along the axis of supercavity from the cavitator when other models and flow parameters are constant for the given trajectory curvature. For the variable curvature, the supercavity sheds due to its instability caused by the time-varying angle of attack. The deviation increases along the length of supercavity if the curvature remains the same sign.     

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基于ERDAS平台的NDVI植被覆盖变化检测

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