The driving force of sediment suspension on sediment-water interface in shallow lakes

被引：2
|
作者：
Li Y. [1 ,2 ]
Wang J. [1 ]
Jiang L. [1 ]
Tang C. [4 ]
Du W. [1 ]
Luo L. [3 ]
Dai S. [3 ]
机构：
[1] College of Environment, Hohai University, Nanjing
[2] Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing
[3] Nanjing Institute of Geography and Liminology, Chinese Academy of Sciences, Nanjing
[4] Environmental Process Modelling Centre, Nanyang Environmental and Water Research Institute, Nanyang Technological University, Singapore
来源：
Wang, Jianwei (1403860485@qq.com) | 2017年 / Science Press卷 / 29期
关键词：
Bottom sediment suspension; Lake Taihu; Sediment-water interface; Shear stress; Suspended solid concentration; Wind;
D O I：
10.18307/2017.0105
中图分类号：
学科分类号：
摘要：
Sediment suspension on sediment-water interface caused by dynamic disturbance is the difficult issue in shallow lake eutrophication control. To study the driving force of sediment suspension in Meiliang Bay of Lake Taihu, a set of synchronous, high-frequency data of current, turbidity, wind, wave are obtained using the Acoustic Doppler Velocimeter, Optical Backscatter Sensor, PH-II Handheld weather stations, and RBRduo T.D. wave tide gauge. The results show that when the wind speed is less than 3 m/s, the average suspended solid concentration (SSC) on sediment-water interface is approximately 59 mg/L. The bottom shear stresses generated by waves is nearly equal to that generated by currents, where no sediment suspension can be found and the comprehensive shear stress generated by wind-induced waves and currents is less than 0.015 N/m2. When the wind speed ranges from 3 to 6 m/s, the average SSC on sediment-water interface is approximately 103 mg/L. The bottom shear stresses generated by waves is greater than that generated by currents in most cases, where a medium amount of sediment is suspended and the comprehensive shear stress generated by wind-induced waves and currents ranges from 0.015 to 0.25 N/m2. When the wind speed exceeds 6 m/s and the average SSC on sediment-water interface is approximately 174 mg/L, the wave-generated shear stress plays an absolute leading role in large amount of sediment suspension and the comprehensive shear stress generated by wind-induced waves and currents is larger than 0.25 N/m2. The critical shear stress of sediment suspension in Meiliang Bay is approximately 0.015 N/m2 while the critical wind speed is 3 m/s. © 2017 by Journal of Lake Sciences.
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页码：43 / 51
页数：8
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