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《Resources and Enuironment In The Yangtza Basin》 2001-01
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THE UTILIZATION OF FRESHWATER RESOURCES AND THE RESERVOIRS OF AVOIDING SALTWATER AND STORING FRESHWATER IN THE CHANGJIANG ESTUARY

MAO Zhi chang,SHEN Huan ting,HUANG Qing hui (State key Laboratory of Estuarine and Coastal Research,Institute of Estuarine and Coastal Research,East China Normal University,Shanghai 200062,China)  
To exploit and utilize the freshwater resources of the Changjiang Estuary,studies on the pollutants of estuarine waters and the spatial and temporal variation of saltwater intrusion are very important.The results show that the water quality is good from -5 m isobath to the main channel in the Changjiang Estuary except local pollutions in shoal waters by the south bank,and that there are two sources of saltwater intrusion in South Branch,South Channel,North Channel of the Changjiang Estuary,one directly from the outer sea and the other from North Branch.Temporal changes in the salinity of the Changjiang Estuary have daily,semimonthly,seasonal and yearly variations.There exists lower salinity during spring tide and at flood slack in South Branch.The Baogang and Chenhang Reservoirs have been built in accordance with the regulation of saltwater intrusion,in order to control the time of intake of water and to avoid saltwater.The longest duration when the chlorinity continuously exceeds 250 mg/L were estimatied with statistics,numerical simulation,ARMAX model+Markov model,which are the key values for determining the storage capacity of reservoirs.The water intake engineering of the Changjiang Estuary is composed of water intake system,regulative reservoir and the system of water supply.The successful experience of avoiding saltwater and storing freshwater sets us a good example for exploiting and utilizing freshwater resources in tidal estuary.
【CateGory Index】: TV213.9
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