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A model study of influence of circulation on the pollutant transport in the Zhujiang River Estuary and adjacent coastal waters

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Acta Oceanologica Sinica 2004年第2期23卷 225-237页

作者： WONGLaiAh GUANWeibing chenjay-chung SUJilan CenterforCoastalandAtmosphericResearch HongKongUniversityofScienceandTechnologyHongKongChina KeyLaboratoryofOceanDynamicProcessesandSatelliteOceanographyofStateOceanicAdministration Hangzhou310012China

A tracer model with random diffusion coupled to the hydrodynamic model for the Zhujiang River Estuary (Pearl River Estuary, PRE) is to examine the effect of circulations on the transport of completely conservative pollutants. It is focused on answering the following questions: (1) What role does the estuarine plume front in the winter play in affecting the pollutants transport and its distribution in the PRE ? (2) What effect do the coastal currents driven by the monsoon have on the pollutants transport? The tracer experiment results show that: (1) the pollutant transport paths strongly depend on the circulation structures and plume frontal dynamics of the PRE and coastal waters; (2) during the summer when a southwesterly monsoon prevails, the pollutants from the four easterly river inlets and those from the bottom layer of offshore stations will greatly influence the water quality in Hong Kong waters, however, the pollutants released from the four westerly river-inlets will seldom affect the water qual

关键词： 3D numerical modeling pollutant matter transport Zhujiang River Estuary

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Methodology for estimation of river discharge and application of the Zhujiang River Estuary (ZRE)

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Acta Oceanologica Sinica 2004年第3期23卷 377-386页

作者： chenjay-chung WONGLai-Ah CenterforCoastalandAtmosphericResearch HongKongUniversityofScienceandTechnologyHongKongChina

The ZRE is a very complicated estuary with multi-river inlets. The total sum of river discharge in the upstream (away from the tidal influence region) of the Zhujiang River can be easily measured. However, when the total river discharges into the estuary from eight inlets, it is a very difficult task to obtain a continuous river discharge flux data from each branch of the Zhujiang River. However, the different ratios of river discharges between the river branches can significantly affect the estuarine circulation feature and baroclinic process. Moreover, the accuracy of numerical forecast for the estuarine circulation is very much dependent on the accuracy of the time history of the river discharge flux for each branch. Therefore, it is important to estimate river discharge from each branch in order to improve the accuracy of the model forecast for the circulation of the ZRE. The development of a new estimation method of the river discharges is focused on based on the system identification theory, numerical modeling and the time history data from the CODAR observed sea surface current. The new approach has been applied to estimating the time history (hourly) of river discharge from each branch in the upstream of the ZRE.

关键词： River Discharge Estimation CODAR Estuary

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Characteristics of distribution and seasonal variation of aerosol optical depth in eastern China with MODIS products

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Chinese Science Bulletin 2003年第22期48卷 2488-2495页

作者： LIChengcai MAOJietait LAUKai-HonAlexis chenjay-chung YUANZibing LIUXiaoyang ZHUAihua LIUGuiqing DepartmentofAtmosphericScience SchoolofPhysicsPekingUni-versityBeijing100871China CenterforCoastalandAtmosphericResearch TheHongKongUniversityofScienceandTechnology(HKUST)HongKongChina Atmospheric MarineandCoastalEnvironment(AMCE)ProgramHKUSTHongKongChina

The accuracy of MODIS aerosol products from the NASA Terra Satellite is validated in comparison with the results of sun-photometer observations in Beijing and Hong Kong. By analyzing the MODIS aerosol products within the period of August 2000 to April 2003, it is believed that human activities are the main source of aerosols in the eastern part of China. This is based on the facts that all areas with relatively high values are consistent with regions of dense population and fast economic development, such as the North China Plain, the Sichuan Basin and the Pearl River Delta. It is also supported by the distribution of 舗gstr鰉 exponents showing that most aerosols in the eastern part of China are closely related to human activities, excepting the strong sandstorm episodes occurring in spring, fall and winter. In contrast to developed countries, the 舗gstr鰉 exponent of urban area in China is lower than its surroundings, indicating that the contribution of local floating dust and soot attributed to human activities is significant. Results presented in this paper provide important data for further research on climatic change and environmental study.

关键词：中国东部地区沙暴大气浮质气候变化浮质光学深度

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