A Numerical Study On The Optimal Search Area And Search Patterns Over Sea

In physical oceanography, a tracer is a substance such as a dye or a radioactive isotope that can be traced as it is transported with the mean flow field. The measurement of anthropogenic and natural tracers in the ocean provided the first estimate about the time scales of the ventilation of the deep ocean.Since the 1970s, tracer methods have made significant contributions to the understanding of the ocean circulation, internal water mass structures and time scales of the ventilation. Furthermore, numerical simulations of tracer transport are a valuable tool to estimate the dispersion of pollutants such as oil or sewage disposals in the ocean for the research of the long-term effects and the development of effective counter-active measures.Advective processes play a key role in the transport of tracer particles, therefore a particle tracking model should resolve these processes as accurate as possible. In this thesis, the analytical solution of the Lagrangian advection equation is used to implement a Lagrangian tracer model. In addition to advection, transport occurs due to turbulent motions in the water column. Turbulent mixing is included in the particle tracking model by means of a stochastic model. Since that time stochastic or random walk models of particle motions have proved .In this study, a brief review of overall institutional framework of SAR force in China and the basic SAR methods in practice are presented. The method to enduce optimal search area and search patterns is also included in this paper. At chapter 7, the author draws a conclusion and prodict the further reasearch.