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首页> 外文学位 >Improved Post-storm Model Predictions of Barrier Island Response to Extreme Events by Including Land Cover Effects on Sediment Transport Capacity.
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Improved Post-storm Model Predictions of Barrier Island Response to Extreme Events by Including Land Cover Effects on Sediment Transport Capacity.

机译：通过包括土地覆盖对泥沙输送能力的影响，改进了对风暴岛事后对极端事件的反应的模型预测。

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摘要

The objective of this thesis is to present geospatial and numerical tools and methods to study short term barrier island evolution. The first stage in this is achieved by raster based techniques used to asses the barrier island evolution in a decadal time frame by analyzing time series of coastal elevation data in order to extract spatial patterns of barrier island evolution dynamics. Multiple storm events may happen in a decadal time frame which are dominant factors in shaping barrier island morphology. Therefore in the second stage, the eXtreme Beach behavior (XBeach) model is used to simulate the process of barrier island response (e.g., beach and dune erosion, overwash and breaching). It is shown that under inundation overwash conditions XBeach reproduces common overwash features however the amount of erosions were calculated to be higher than the measured erosion and the model exhibited high sensitivity to total surge levels and surge level gradients across the barrier island. The main cause of the problem was identified as the traditional representation of a study location as consisting only sand in the numerical model domain. To address the problem, a methodology was implemented to mimic the effects of land cover features on the sediment transport capacity. The effects of the land cover effect implementation were validated by simulating two breaching cases occurred on the Outer Banks of North Carolina barrier islands during Hurricane Irene. After validation, hypothetical but realistic scenarios were tested in order to demonstrate the usefulness of the modeling framework to stakeholders interested in developing barrier island management and protection strategies. The improvements on the prediction capacity by including land cover effects were also shown to be valid in widely used 1D applications.
机译：本文的目的是提供地理空间和数值工具及方法来研究短期屏障岛的演变。第一阶段是通过基于栅格的技术来实现的，该技术用于通过分析沿海高程数据的时间序列，在十年时间内评估屏障岛演变，以提取屏障岛演变动力学的空间模式。在十年时间范围内可能会发生多次风暴事件，这是影响屏障岛形态的主要因素。因此，在第二阶段中，使用极限海滩行为（XBeach）模型来模拟屏障岛响应的过程（例如，海滩和沙丘侵蚀，过度冲洗和破坏）。结果表明，在淹没过度冲洗条件下，XBeach可以再现常见的过度冲洗特征，但是计算得出的腐蚀量要高于所测得的腐蚀量，并且该模型对整个浪涌水平和整个势垒岛上的浪涌水平梯度表现出很高的敏感性。该问题的主要原因被确定为研究位置的传统表示，因为它仅在数值模型域中由沙子组成。为了解决这个问题，采用了一种方法来模拟土地覆盖特征对泥沙输送能力的影响。通过模拟飓风“艾琳”期间在北卡罗来纳州障壁岛外滩发生的两个破坏事件，验证了土地覆盖效应实施的效果。验证之后，对假设但现实的情景进行了测试，以向对开发障碍岛管理和保护战略感兴趣的利益相关者展示建模框架的有用性。通过包括土地覆盖效应对预测能力的改进在广泛使用的一维应用中也被证明是有效的。

著录项

  • 作者

    Kurum, Mustafa Onur.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 162 p.
  • 总页数 162
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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