Abstract:In this paper, the development and implementation of a three-dimensional, numerical pollutant transport model, which is based on an orthogonal curvilinear coordinate system in the horizontal direction and a sigma coordinate system in the vertical direction, is delineated. An efficient as well as simple open boundary condition is employed for pollutant transport in this mathematical model. It is then applied to model the distribution and transport of Chemical Oxygen Demand (COD) in the Pearl River Estuary (PRE). The results from the numerical simulations illustrate that the transboundary or inter-boundary effects of pollutants, between the Guangdong Province and the Hong Kong Special Administrative Region due to the wastewater discharged from the Pearl River Delta Region, are quite strong.

As the related theory and technology of digital earth has been evolved since the concept of "digital earth" put forward by U.S. Vice President Al Gore, and more and more attention has been paid to ocean exploration and usage around the world in recent years, China ocean administration, together with oceanographers, proposes the "Digital Ocean" program from the state ocean development strategy point and puts it in the HI-TECH Research and Development Programs. "Digital Ocean", which comes from digital earth, has no exact definition currently and will be a large complicated project because it refers to many other technologies and methods such as wideband network, satellite remote sensing imagery data acquisition, mass data store and compression, interoperability, scientific computing, distributed objects, and virtual reality, spatial data warehouse, metadata database and Web GIS etc. China Digital Ocean Prototype System (CDOPS) which is the kernel part of "Digital Ocean", is designed and constructed tentatively. It provides a visualization, presentation and spatial analysis platform for ocean three-dimensional monitoring data and information. Ocean administrations, professionals, military departments and common users will benefit from that system. In this paper, one kind of understanding of "Digital Ocean" in China is introduced firstly. And then the architecture of the CDPOS is put forward. In addition, the design and preliminary realization of the 9 sub-system functions are presented. At last, some key technology problems faced in constructing CDOPS are discussed.

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In the ocean dynamical environment real-time observing system of Taiwan Strait and adjacent maritime region, multiple observing data such as remote sensing data, structured data and so on are produced by the observing net from airspace, ocean surface, underwater space and ocean bottom. The data sharing and web service is a key part to influence the application efficiency of the whole system. According to the characteristics of the oceanic dynamical environment of Taiwan Strait, the construction scheme of the observing net is introduced in this paper firstly. Then the architecture of the observing data sharing and web service system is introduced, which includes five parts, i.e. the observing data acquiring module, the data integration module, the data processing and information production development module, and the data sharing and web service module. Next, the user classification system and service content classification are introduced. At last, the technology realization strategy and application in shipwreck salvation is introduced.

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