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《Environmental Science & Technology》 2013-S1
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Study on the Release of Salt From Sediments of Beidagang Reservoir

HU Peng1,LIU Chun-guang1,SUN Hong-wen1,CHANG Su-yun2,ZHANG Kai2((1.Key Laboratory of Pollution Processes and Environmental Criteria,Ministry of Education,Nankai University,Tianjin 300071,China;2.Tianjin Hydraulic Science Research Institute,Tianjin 300061,China)  
Salt release from sediments is one of the main reasons for the salinization of coastal freshwater reservoirs.Various factors including conditions of overlying water may influence the release of salt from sediments.To investigate the salt release characteristics of sediments and related influential factors,sediment samples were collected from a coastal reservoir Beidagang Reservoir.The salt content in sediment samples were measured,and laboratory simulating experiments were conducted to check the possible influence of different factors,including the salt content of sediments,the depth of overlying water,the salt concentration of overlying water,and the disturbance of overlying water.The results show that the total salt concentrations range from 0.095% to 0.818%,indicating that the sediments can be defined as slightly or moderately saline soils.Salt concentrations of the sediments from the center of the reservoir are higher than those from outer sites.The results of indoor experiments show that sediment salt release fluxes are greater under the following conditions: the higher sediment salt content,the deeper overlying water,the lower overlying water salt concentration,and the disturbance of overlying water.This study demonstrates that salt release from sediments can be influenced by many factors,and understanding the influential factors will help explicate the mechanisms of water salinization of coastal reservoirs.
【Fund】: 国家科技支撑计划项目(2012BAC07B02);; 水利部公益性行业科研专项经费项目(201101060)
【CateGory Index】: X832
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