| 引用本文: | 高小孟,李一平,杜薇,罗潋葱,李慧赟,戴淑君,许益新,张兴通,邱勇军.太湖梅梁湾湖区悬浮物动态沉降特征的野外观测.湖泊科学,2017,29(1):52-58. DOI:10.18307/2017.0106 |
| GAO Xiaomeng,LI Yiping,DU Wei,LUO Liancong,LI Huiyun,DAI Shujun,XU Yixin,ZHANG Xingtong,QIU Yongjun.Suspended solid settlement characteristics in Meiliang Bay of Lake Taihu: in situ observation. J. Lake Sci.2017,29(1):52-58. DOI:10.18307/2017.0106 |
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| 太湖梅梁湾湖区悬浮物动态沉降特征的野外观测 |
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高小孟1,2, 李一平1,2, 杜薇1,2, 罗潋葱3, 李慧赟3, 戴淑君3, 许益新1, 张兴通1, 邱勇军1
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1.河海大学环境学院, 南京 210098;2.河海大学浅水湖泊综合治理与资源开发教育部重点实验室, 南京 210098;3.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008
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| 摘要: |
| 沉降运动是悬浮物主要运动形式之一，是影响营养盐内源释放的主要运动过程，研究悬浮物沉降速度对湖泊富营养化的研究具有重要意义.为了解浅水湖泊悬浮物的沉降特征，以太湖梅梁湾为例，采用声学多普勒流速仪，光学后向散射浊度仪以及风速风向仪在梅梁湾进行了连续9 d的野外观测.采用扩散沉降平衡的方法计算小风速情况下悬浮物的沉降速度，并对沉降速度与垂向流速、风速、悬浮物浓度的关系进行分析.结果表明悬浮物平均沉降速度为0.0785 mm/s，表层垂向流速和悬浮物浓度对悬浮物沉降速度变化起主要作用；而在底层，风速、垂向流速、悬浮物浓度都对悬浮物运动有重要影响，具体表现为风速>1.5 m/s时，垂向流速紊动增大，悬浮物因起悬而浓度较大，并且沉降速度波动较大；风速<1.5 m/s时，垂向流速基本向下且流速较小，沉降速度也较小.本文揭示了大型浅水湖泊悬浮物的动态沉降特征，为今后太湖污染物的输移、水环境数学模型和湖泊富营养化的深入研究奠定了必要的基础. |
| 关键词: 沉降速度 悬浮物浓度 太湖 梅梁湾 |
| DOI：10.18307/2017.0106 |
| 分类号: |
| 基金项目:中央高校基本科研业务项目基金项目（2014B07314）、国家自然科学基金项目（51579071，51379061）、江苏省普通高校研究生科研创新计划项目（2015B36614）、国家自然科学基金创新研究群体项目（51421006）、江苏省“创新团队计划”项目和江苏省高校优势学科建设工程项目联合资助. |
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| Suspended solid settlement characteristics in Meiliang Bay of Lake Taihu: in situ observation |
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GAO Xiaomeng1,2, LI Yiping1,2, DU Wei1,2, LUO Liancong3, LI Huiyun3, DAI Shujun3, XU Yixin1, ZHANG Xingtong1, QIU Yongjun1
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1.College of Environment, Hohai University, Nanjing 210098, P. R. China;2.Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, P. R. China;3.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
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| Abstract: |
| 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. |
| Key words: Settling velocity suspended solid concentration Lake Taihu Meiliang Bay |
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