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首页> 外文期刊>Environmental Science & Technology >Evolution of Sediment Plumes in the Chesapeake Bay and Implications of Climate Variability
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Evolution of Sediment Plumes in the Chesapeake Bay and Implications of Climate Variability

机译：切萨皮克湾沉积物羽流的演变及其气候变化的意义

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摘要

Fluvial sediment transport impacts fisheries, marine ecosystems, and human health. In the upper Chesapeake Bay, river-induced sediment plumes are generally known as either a monotonic spatial shape or a turbidity maximum. Little is known about plume evolution in response to variation in streamflow and extreme discharge of sediment. Here we propose a typology of sediment plumes in the upper Chesapeake Bay using a 17 year time series of satellite-derived suspended sediment concentration. On the basis of estimated fluvial and wind contributions, we define an intermittent/wind-dominated type and a continuous type, the latter of which is further divided into four subtypes based on spatial features of plumes, which we refer to as Injection, Transport, Temporary Turbidity-Maximum, and Persistent Turbidity-Maximum. The four continuous types exhibit a consistent sequence of evolution within 1 week to 1 month following flood events. We also identify a "shift" in typology with increased frequency of Turbidity-Maximum types before and after Hurricane Ivan (2004), which implies that extreme events have longer-lasting effects upon estuarine suspended sediment than previously considered. These results can serve as a diagnostic tool to better predict distribution and impacts of estuarine suspended sediment in response to changes in climate and land use.
机译：河流沉积物的运输影响着渔业，海洋生态系统和人类健康。在切萨皮克湾上游，通常认为河流引起的泥沙羽流是单调的空间形状或最大的浊度。关于羽流演变以响应水流变化和沉积物的极端排放知之甚少。在这里，我们使用卫星衍生的悬浮沉积物浓度的17年时间序列，提出切萨皮克湾上层沉积物羽流的类型学。根据估算的河流和风的贡献，我们定义了一种间歇性/以风为主的类型和一种连续类型，根据羽的空间特征，将后者进一步分为四个子类型，我们将其称为注入，运输，最大临时浊度和最大持久浊度。在洪水事件发生后的1周至1个月内，这四种连续类型呈现出一致的演变顺序。我们还发现，在飓风“伊万”（2004年）之前和之后，浊度-最大值类型的频率增加，类型学发生了“转变”，这意味着极端事件对河口悬浮沉积物的影响比以前考虑的要持久。这些结果可作为诊断工具，以更好地预测响应气候和土地利用变化的河口悬浮沉积物的分布和影响。

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  • 来源
    《Environmental Science & Technology》 |2015年第11期|6494-6503|共10页
  • 作者

    Guangming Zheng; Paul M. DiGiacomo; Sujay S. Kaushal; Marilyn A. Yuen-Murphy; Shuiwang Duan;

  • 作者单位

    NOAA/NESDIS/Center for Satellite Applications and Research, 5830 University Research Court, College Park, Maryland 20740, United States ,Earth System Science Interdisciplinary Center, University of Maryland, 5825 University Research Court, College Park, Maryland 20740, United States ,Global Science & Technology, Inc., 7855 Walker Drive, Suite 200, Greenbelt, Maryland 20770, United States;

    NOAA/NESDIS/Center for Satellite Applications and Research, 5830 University Research Court, College Park, Maryland 20740, United States;

    Earth System Science Interdisciplinary Center, University of Maryland, 5825 University Research Court, College Park, Maryland 20740, United States;

    NOAA/NESDIS/Center for Satellite Applications and Research, 5830 University Research Court, College Park, Maryland 20740, United States;

    Earth System Science Interdisciplinary Center, University of Maryland, 5825 University Research Court, College Park, Maryland 20740, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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