海岸带陆海相互作用中国委员会

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（1）Variability of material fluxes from the Yangtze River Based on hydrologic and hydrogeochemical data in the Yangtze River Basin from 1968 through 1997, increasing tendency of N and P fluxes and its relationship with fertilization practice in the basin were proposed.

Concentrations and fluxes of nutrients at Datong Station near the Yangtze River estuary

（2）Seasonal, interannual and decadal variations of circulation, water property and nutrient supply in the East China Sea (ECS) and their relationships with fishery ground Based on 40-year time series of temperature and salinity with historic data, an obvious increase of SST in the northern ECS, statistical correlation between physical environment, fishing catch and ground formation, and the dramatic change of nutrient supply mechanism in the Zhoushan Fishery Ground caused by increasing fertilization practice in the river basin since 1960’s were proposed and evaluated.

（3）Transportation and sedimentation of fine material in the ECS Based on 22-cruise TSM data in the ECS, an obvious decline tendency of TSM since 1960’s was revealed; distribution of sediment simulated with a 3-D material transportation and sedimentation model concerning circulation, tidal current and waves was roughly consistent with observations; formation mechanism of mud patch off the Zhejiang Coast was suggested; mud in Okinawa Trough was supposed to be from the Old Yellow River Estuary.


Water and sediment discharges at Datong station near the Changjiang River Estuary	Surface, April 1976	Surface, April 1994

Budget and balance of particle in the East China Sea（106t/a）	Simulated surface sediment distribution in the Yellow Sea and East China Sea

（4）Red-tide in the China coastal seas The HAB event increased dramatically from averaged 65 times in 1980s to 234 times in 1990s along Chinese coast, and more and more toxic and harmful algal species were found recently. In the ECS (main research area), population characteristics and ecological strategy of HAB causing species, key physical oceanography processes to HAB, the role of nutrients in HAB, the impact of HAB and its control have been studied.


The HAB event increased dramatically along Chinese coast	10,000 km2 Prorocentrum red-tide in the ECS in spring, 2004

（5）Mechanism, variation and environmental impact of sand transportation in the Yellow River Estuary Statistical relationships between climate change/human activities, water/sand discharges of the Yellow River and estuary accumulation rate were established; anthropogenic influence on the Yellow River Estuary accumulation rate was studied on 102-103-year time scales.