Suspended solid settlement characteristics in Meiliang Bay of Lake Taihu: in situ observation

被引：1
|
作者：
Gao X. [1 ,2 ]
Li Y. [1 ,2 ]
Du W. [1 ,2 ]
Luo L. [3 ]
Li H. [3 ]
Dai S. [3 ]
Xu Y. [1 ]
Zhang X. [1 ]
Qiu Y. [1 ]
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] State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing
来源：
Li, Yiping (liyiping@hhu.edu.cn) | 2017年 / Science Press卷 / 29期
关键词：
Lake Taihu; Meiliang Bay; Settling velocity; Suspended solid concentration;
D O I：
10.18307/2017.0106
中图分类号：
学科分类号：
摘要：
Suspended solid settlement is one of the main transport forms, and plays an important role in lake nutrient release. Thus, study on suspended solid settling velocity is significant to understand the eutrophication. To study the suspended solid settling velocity, this paper takes Lake Taihu as an example. Field 9 days-in situ observations were conducted in Meiliang Bay using Acoustic Doppler Velocity, Optical Backscatter Sensor and PH-ⅡHandheld weather stations. The suspended solid settling velocity was estimated by the balance of settling and diffusive flux, and we analyzed the relationship among wind speed, vertical velocity, suspended solid concentration (SSC) and settling velocity. The results were obtained: (1) the mean settling velocity is 0.0785 mm/s; (2) the vertical velocity and SSC has a great effect on sediment transport in the surface layer; (3) in the bed layer, the relationship among settling velocity, vertical velocity and SSC shows that when the wind speed was higher than 1.5 m/s, the vertical velocity with large fluctuations and high SSC and the settling velocity were slower; when the wind speed was lower than 1.5 m/s, the vertical velocity was slower and the SSC was small, but settling velocity was quicker, which means the more SSC the quicker settling velocity. It reveals the characteristics of suspended solid settlement in large shallow lakes, which is the necessary foundation in further study of pollutants transport, water environmental mathematic and eutrophication. © 2017 by Journal of Lake Sciences.
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页码：52 / 58
页数：6
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