Critical velocity in phosphorus exchange processes across the sediment-water interface  

作　　者：Jun Wan Ze Wang Zhijie Li Huiling Duan HezhongYuan 

机构地区：[1]State Key Laboratory for Turbulence and Complex System, Department of Mechanics and Aerospace Engineering,College of Engineering, Peking University [2]College of Mechanics and Materials, Hohai University [3]Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences [4]School of Life Sciences, Nanjing University

出　　处：《Journal of Environmental Sciences》2013年第10期1966-1971,共6页环境科学学报（英文版）

基　　金：supported by the Major State Basic Research Development Program of China(No.2011CB013101);the National Natural Science Foundation of China(No.10872003,10932001,11172001);the National Excellent Doctoral Dissertation of China(No.2007B2);the National Basic Research Program (973) of China(No.2008CB418203);the National Science and Technology Specific Project of China(No.20080ZX07422)

摘　　要：Sediments are ultimate sinks of nutrients in lakes that record the pollution history evolutionary processes, and anthropogenic activities of a lake. However, sediments are considered as inner sources of environmental factor changes such as the variation in hydrodynamic conditions because of the nutrients they release. How does this process happen？ This study investigates a typical nutrient phosphorus （P） exchange among sediment, suspended particle matter （SPM）, and water. Compared with numerical and experimental studies, this study confirms that the critical velocity that occurs at a lower flow rate state exists in the range of 7 to 15 crn/sec. Critical velocity below the critical flow rate promotes the migration of particulate phosphorus （PP） to the SPM. On the other hand, critical velocity above the critical flow rate promotes the release of PP in water.Sediments are ultimate sinks of nutrients in lakes that record the pollution history evolutionary processes, and anthropogenic activities of a lake. However, sediments are considered as inner sources of environmental factor changes such as the variation in hydrodynamic conditions because of the nutrients they release. How does this process happen？ This study investigates a typical nutrient phosphorus （P） exchange among sediment, suspended particle matter （SPM）, and water. Compared with numerical and experimental studies, this study confirms that the critical velocity that occurs at a lower flow rate state exists in the range of 7 to 15 crn/sec. Critical velocity below the critical flow rate promotes the migration of particulate phosphorus （PP） to the SPM. On the other hand, critical velocity above the critical flow rate promotes the release of PP in water.

关 键 词：abrupt expansion flow critical velocity lake eutrophication phosphorus exchange 

分 类 号：X131.2[环境科学与工程—环境科学]