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Modeling the effect of climate change on suspended sediment load and sediment resuspension in an urban river.

机译：模拟气候变化对城市河流中悬浮泥沙负荷和泥沙再悬浮的影响。

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摘要

Suspended sediment remains a major challenge for environmental system modeling due to its non-point source feature and complicated transport regime and it has rarely been investigated under the climate change context. This study uses a watershed hydrology and sediment yield model (GWLF) and a hydrodynamic and sediment transport model (WASP) to estimate suspended sediment load and bed material resuspension for the Aberjona River, MA and predict changes in response to variations in future climate. Depending on climate scenario, mean annual suspended load change between -2% to 19% from current level (1950-1999) is found for the Mid-century (2030-2059) and -8% to 18% for the end of the century (2070-2099) while mean annual sediment resuspension is projected to increase by 8% to 52% in the Mid-century and 2% to 89% by the end of the century. Mean monthly suspended load is modeled to change by -87% to 140% for the Mid-century and by -87% to 164% for the end of the century. Change in monthly resuspension varies from -99% to 237% and -100% to 342% for the two scenario periods respectively. The increase of suspended sediment load corresponds to the increase of surface runoff due to more rainfall but higher evapotranspiration caused by warming trend counteracts it. Sediment resuspension is significantly intensified under more frequent occurrence of extreme high flow condition.
机译：悬浮沉积物由于其非点源特征和复杂的运输机制而仍然是环境系统建模的主要挑战，并且很少在气候变化背景下对其进行研究。这项研究使用流域水文和沉积物产量模型（GWLF）以及水动力和泥沙输送模型（WASP）来估算马萨诸塞州阿伯霍纳河的悬浮泥沙负荷和河床物质重悬浮，并预测响应未来气候变化的变化。根据气候情景，本世纪中叶（2030-2059）的平均年度悬浮负荷变化为当前水平（1950-1999）的-2％至19％，本世纪末为-8％至18％ （2070年至2099年），而在本世纪中期，平均每年的泥沙悬浮量预计将增加8％至52％，到本世纪末将增加2％至89％。到本世纪中叶，平均每月悬浮负荷的变化范围为-87％至140％，到本世纪末，则为-87％至164％。在这两种情况下，每月重悬浮的变化分别为-99％至237％和-100％至342％。悬浮泥沙负荷的增加对应于降雨增加引起的地表径流的增加，但变暖趋势引起的更高的蒸散作用抵消了它。在更频繁出现的极端高流量条件下，泥沙的悬浮明显增强。

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  • 作者

    Zhao, Shuo.;

  • 作者单位

    Tufts University.;

  • 授予单位 Tufts University.;
  • 学科 Environmental Sciences.;Engineering Environmental.
  • 学位 M.S.
  • 年度 2014
  • 页码 67 p.
  • 总页数 67
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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