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首页> 外文会议>International Conference on Coastal Engineering 2006(ICCE 2006); 20060903-08; San Diego,CA(US) >CHARACTERISTIC SHORELINE CHANGE PATTERNS IDENTIFIED USING EOF ANALYSIS
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CHARACTERISTIC SHORELINE CHANGE PATTERNS IDENTIFIED USING EOF ANALYSIS

机译：利用EOF分析确定特征性的海岸线变化模式

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摘要

The method of empirical orthogonal functions (EOF) or principal component analysis (PCA) is used to investigate the spatial and temporal variability of shoreline data sets from Duck, North Carolina, the Gold Coast, Australia, and the United States Pacific Northwest. The majority of the variability at each site (nearly 95%) is represented by the first four eigenfunctions, which generally highlight the influence of shore-perpendicular features on the nearshore morphology. Interesting, longshore periodic features, perhaps related to the presence of sand waves, are identified at both Duck and the Gold Coast, while boundary effects related to natural headlands and navigational structures/entrances dominate the longshore variability in the Pacific Northwest. The temporal eigenfunctions associated with these longshore variations are compared with several parameters that are frequently used to characterize the nearshore environment. Correlations are sought between the individual modes of shoreline change and the local conditions. The nearshore parameters considered include the wave energy (E), the cross-shore and longshore wave energy fluxes (F_x and F_y), the wave steepness (H_0/L_0), the non-dimensional fall velocity parameter (Ω), the profile parameter (P), the surf-similarity parameter (ξ), and a surfzone Froude number (F_r). The strongest correlations were obtained between the monthly means of several of the forcing parameters and the temporal coefficients of longshore uniform modes of shoreline change.
机译：经验正交函数（EOF）或主成分分析（PCA）方法用于研究来自鸭，北卡罗来纳州，黄金海岸，澳大利亚和美国西北太平洋地区的海岸线数据集的时空变化。每个站点的大部分变化（将近95％）由前四个特征函数表示，这些函数通常会突出显示岸垂直特征对近岸形态的影响。在鸭子和黄金海岸都发现了有趣的，可能与沙波存在有关的周期性特征，而与自然岬角和导航结构/入口相关的边界效应主导了西北太平洋的多样性。将与这些近岸变化相关的时间本征函数与经常用于表征近岸环境的几个参数进行比较。在海岸线变化的各个模式与当地条件之间寻求相关性。考虑的近岸参数包括波能（E），跨岸和近岸波能通量（F_x和F_y），波陡度（H_0 / L_0），无量纲下降速度参数（Ω），剖面参数（P），海浪相似度参数（ξ）和海浪弗洛德数（F_r）。在一些强迫参数的月平均值与海岸线沿岸统一模式的时间系数之间获得了最强的相关性。

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