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

被引：7
|
作者：
Wan, Jun [1 ,2 ]
Wang, Ze [2 ]
Li, Zhijie [3 ]
Duan, Huiling [1 ]
Yuan, Hezhong [4 ]
机构：
[1] Peking Univ, Coll Engn, Dept Mech & Aerosp Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China
[2] Hohai Univ, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China
[3] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
[4] Nanjing Univ, Sch Life Sci, Nanjing 210093, Jiangsu, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL SCIENCES | 2013年 / 25卷 / 10期
基金：
中国国家自然科学基金;
关键词：
abrupt expansion flow; critical velocity; lake eutrophication; phosphorus exchange; LAKE-SEDIMENTS; RELEASE; CHINA; FLOW; FRACTIONATION; RESUSPENSION; ADSORPTION; SOILS; ERKEN; RIVER;
D O I：
10.1016/S1001-0742(12)60254-X
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
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 cm/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.
引用
收藏
页码：1966 / 1971
页数：6
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