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首页> 外文期刊>The Science of the Total Environment >Dynamic behavior of sediment resuspension and nutrients release in the shallow and wind-exposed Meiliang Bay of Lake Taihu
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Dynamic behavior of sediment resuspension and nutrients release in the shallow and wind-exposed Meiliang Bay of Lake Taihu

机译：太湖浅凉梅风湾沉积物悬浮和养分释放的动态行为

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摘要

Wind-induced sediment resuspension frequently occurs in Lake Taihu, a typical large shallow lake in China. Internal nutrients release accompanied by sediment resuspension is supposed to sustain the eutrophic status and algal boom persistence. In this study, high-frequency and synchronous in situ observation of the wind field, currents, waves, suspended sediments, and nutrients were collected to understand the dynamic behaviors of sediment and nutrients under multiple natural disturbances in Meiliang Bay, Lake Taihu. Results suggest that both wind speed and wind fetch length could effectively activate the sediment layer and trigger particles entrainment into the overlying water. Wind speed of 4 m/s with long wind fetch (between east and southeast wind direction) was the critical value for sediment resuspension. Furthermore, wind-induced wave shear stress and stochastic nature of turbulence at the water-sediment interface were the driving force for sediment resuspension. Specifically, incipient motion of sediment occurred when shear stress was ranging from 0.02 to 0.07 N/m~2. Wind-induced sediment resuspension had significantly contributed to nutrients release of particulate N and P, whereas dissolved nutrients concentration was less affected, internal nutrients release by wind could maintain a significant potential for obstinate eutrophication and algal bloom. This study has revealed the dynamic response of nutrients release to sediment resuspension and wind-induced hydrodynamics. Therefore, a better understanding of the mechanism of internal nutrients release will benefit the effective and sustainable management of the shallow and wind-exposed lakes.
机译：风引起的沉积物再悬浮经常发生在太湖上，太湖是中国典型的大型浅水湖泊。内部营养物质的释放伴随着沉积物的重新悬浮被认为可以维持富营养化状态和藻类繁荣的持久性。本研究通过对风场，海流，波浪，悬浮沉积物和养分进行高频同步原位观测，以了解太湖梅梁湾自然扰动下沉积物和养分的动态行为。结果表明，风速和取风长度都可以有效地激活沉积物层并触发颗粒夹带进入上覆水中。长风时（东风向和东南风向之间）风速为4 m / s是沉积物重悬的临界值。此外，风沙剪切应力和水-沉积物界面处湍流的随机性是沉积物重悬的驱动力。具体而言，当剪切应力在0.02至0.07 N / m〜2范围内时，沉积物开始运动。风引起的沉积物重悬显着促进了氮和磷颗粒的养分释放，而溶解性养分浓度受到的影响较小，风中的内部养分释放可保持顽固富营养化和藻华的巨大潜力。这项研究揭示了养分释放对沉积物再悬浮和风致水动力的动态响应。因此，更好地了解内部养分释放的机制将有利于浅水和风蚀湖泊的有效和可持续管理。

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  • 来源
    《The Science of the Total Environment》 |2020年第15期|135131.1-135131.10|共10页
  • 作者

    Chunyan Tang; Yiping Li; Chao He; Kumud Acharya;

  • 作者单位

    Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education College of Environment Hohai University Nanjing 210098 China South China Institute of Environment Science the Ministry of Ecology and Environment of PRC Guangzhou 510535 China;

    Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education College of Environment Hohai University Nanjing 210098 China;

    Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology School of Environmental Science and Engineering Sun Yat-sen University Guangzhou 510006 China;

    Division of Hydrologic Sciences Desert Research Institute Las Vegas NV 89119 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Sediment resuspension; Nutrients release; Wave shear stress; Turbulence; Shallow lake;

    机译：沉积物重悬;营养释放;波切应力;湍流浅湖;

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