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Dune behavior and aeolian transport on decadal timescales

机译：年代际尺度上的沙丘行为和风沙运移

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摘要

Dunes provide protection for low lying hinterland against flooding due to storms. Due to the dynamic nature of dunes, safety levels provided vary in time. This paper aims to gain insight in how dune building processes govern dune behavior on the yearly to decadal timescale. Dunes grow mainly due to aeolian transport. Most sediment transport formulations suggest that wind velocity is the most important governing parameter for aeolian dune growth. However, in several coastal studies, wind-driven sediment transport has been shown to reach limiting conditions regardless of the wind velocity. Factors that limit the wind-driven sediment transport, such as sediment properties, moisture and beach geometry, can be more important than the wind velocity. The Dutch JARKUS dataset is used to analyze yearly to decadal dune behavior where dune volume changes are taken as a measurable parameter of dune behavior. Measurements of dune volume changes over these timescales mainly show a positive linear trend. Therefore a constant dune growth could be assumed for these specific profiles, which simplifies predictive possibilities. However, the magnitude of the linear dune behavior varies in space (alongshore). It is aimed to find spatial and temporal variations in dune behavior and how these correlate with wind conditions and beach slope. The dune volume changes are found to depend on beach slope which is a transport limiting parameter but no relation between dune behavior and wind forcing is found on the yearly to decadal timescale. Annually averaged erosion volumes as a result of extreme marine events are found to be of similar order as the aeolian growth. In future modeling of decadal dune behavior, we suggest that the variability of transport limiting parameters is of interest rather than time varying forcing conditions such as varying wind speeds and drift potentials.
机译：沙丘可为低洼腹地提供保护，以防止风暴引起的洪水。由于沙丘的动态特性，提供的安全级别会随时间变化。本文旨在了解沙丘构建过程如何在每年到十年的时间尺度上控制沙丘行为。沙丘的增长主要是由于风的运输。大多数沉积物输送公式表明风速是风沙丘生长的最重要控制参数。但是，在一些沿海研究中，无论风速如何，都显示出风驱动的泥沙输送达到极限条件。限制风力驱动沉积物传输的因素，例如沉积物特性，湿度和海滩几何形状，比风速更为重要。荷兰JARKUS数据集用于分析每年到十年的沙丘行为，其中沙丘体积变化被视为沙丘行为的可测量参数。在这些时间范围内，沙丘体积变化的测量结果主要显示出正线性趋势。因此，可以针对这些特定的剖面假设沙丘不断增长，从而简化了预测的可能性。但是，线性沙丘行为的大小在空间（沿岸）不同。目的是发现沙丘行为的时空变化以及这些变化与风况和海滩坡度之间的关系。发现沙丘的体积变化取决于海滩坡度，这是一个运输限制参数，但是在每年到十年的时间尺度上都没有发现沙丘行为和风力之间的关系。发现由于极端海洋事件造成的年平均侵蚀量与风成的相似。在未来的十年沙丘行为建模中，我们建议关注运输限制参数的可变性，而不是随时间变化的强迫条件（例如变化的风速和漂移势）。

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  • 来源
    《Coastal engineering》 |2012年第2012期|p.41-53|共13页
  • 作者

    S. de Vries; H.N. Southgate; W. Kanning; R. Ranasinghe;

  • 作者单位

    Section of Hydraulic Engineering, Delft University of Technology, Delft, 2628 CN, The Netherlands, Bui/ding with Nature, EcoShape, Burgraadt Building, Dordrecht, 3317 JG, The Netherlands;

    Section of Hydraulic Engineering, Delft University of Technology, Delft, 2628 CN, The Netherlands;

    Section of Hydraulic Engineering, Delft University of Technology, Delft, 2628 CN, The Netherlands;

    Section of Hydraulic Engineering, Delft University of Technology, Delft, 2628 CN, The Netherlands, Department of Water Engineering, UNESCO-IHE, TO Box 3015, 2601 DA Delft, The Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    dune development; aeolian processes; building with nature; JARKUS;

    机译：沙丘发育;风沙过程;与自然共建;雅库斯;

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