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首页> 外文学位 >Inferring fine-grained suspended sediment dynamics through analysis of disaggregated inorganic grain sizes (DIGS).
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Inferring fine-grained suspended sediment dynamics through analysis of disaggregated inorganic grain sizes (DIGS).

机译：通过分析分解的无机颗粒尺寸（DIGS）推断细颗粒的悬浮沉积物动力学。

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摘要

The goal of this thesis is to infer suspended fine sediment dynamics through analysis of disaggregated inorganic grain sizes (DIGS). Fine sediment is transported through the water column as single grains and flocs. The degree to which a suspension resides as single grains and flocs influences the flux of suspended particles, and hence, associated contaminants and nutrients to the seabed, as well as the optical and acoustical properties of the water. However, suspended fine sediment dynamics are poorly understood. To complicate the matter, flocs are fragile and difficult to sample without disruption. This thesis improves understanding of fine sediment dynamics using a non-invasive approach to infer suspended fine sediment properties. Direct observation of DIGS behaviour was compared to predictions made by a simple parametric model that infers floc properties by considering deposition of particles as single grains and flocs. Results of this thesis suggest that observed DIGS evolution offers insight into fine sediment behaviour within various simulated and in situ marine environments (e.g. settling column, laboratory flume, and the Eel River flood plume) and implicates flocculation as an important mechanism of particle deposition. Results also suggest that the parametric model estimates size-specific effective settling velocities in good agreement with observations, although the environments in which this model is applicable are limited. Findings of this thesis indicate that interpretation of DIGS behaviour within marine environments is limited without direct observations of floc size and floc fraction.
机译：本文的目的是通过分析分解的无机颗粒尺寸（DIGS）来推断悬浮的细沙动力学。细小的沉淀物以单谷粒和絮凝物形式通过水柱。悬浮液作为单颗粒和絮状物的保留程度会影响悬浮颗粒的通量，进而影响到海底的相关污染物和养分以及水的光学和声学特性。但是，人们对悬浮的细沉积物动力学知之甚少。使事情复杂化的是，絮状物易碎并且难以取样而不会被破坏。本论文使用非侵入性方法来推断悬浮细沙的性质，从而提高了对细沙动力学的理解。将DIGS行为的直接观察结果与简单参数模型所做的预测进行了比较，该模型通过将颗粒沉积为单个颗粒和絮凝物来推断絮凝物的性能。本文的结果表明，观察到的DIGS演化为洞悉各种模拟和原位海洋环境（例如沉降柱，实验室水槽和Eel河洪水羽流）中的精细沉积行为提供了见识，并且暗示絮凝是颗粒沉积的重要机制。结果还表明，尽管适用于该模型的环境有限，但参数模型估计的尺寸特定有效沉降速度与观测值吻合良好。本论文的发现表明，在没有直接观察絮状物尺寸和絮凝物分数的情况下，对海洋环境中DIGS行为的解释受到限制。

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  • 作者

    Curran, Kristian J.;

  • 作者单位

    Dalhousie University (Canada).;

  • 授予单位 Dalhousie University (Canada).;
  • 学科 Physical Oceanography.
  • 学位 M.Sc.
  • 年度 2002
  • 页码 90 p.
  • 总页数 90
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;
  • 关键词

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