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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Pattern analysis of dune-field parameters
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Pattern analysis of dune-field parameters

机译：沙丘场参数的模式分析

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As a basic form of pattern analysis, the parameters of dune spacing, defect density, crest orientation and crest length are measured from remote images and treated statistically for dunes at White Sands in New Mexico, the Algodones in California, the Agneitir in Mauritania, and the Namib in Namibia. Statistical populations are identified from frequency plots of dune spacing and crest length, field-scale calculations of defect density, and rose diagrams of crest orientation. Single populations characterize simple dune fields (White Sands), whereas multiple populations characterize compound/complex dunes (Algodones, Namib), and complex dune fields (Agneitir). As time increases, dune fields show an increase in dune spacing and crest length, a decrease in defect density, more tightly clustered crest orientation, and a reduction in the variance associated with measurements of these parameters. The results are consistent with models of dune fields as self-organizing complex systems in which a characteristic pattern emerges as a function of constructional time. Because pattern evolution is a function of time, it may be possible to use pattern analysis to augment current methods of age determination. Statistically defined populations can be used in geomorphic backstripping to unstack generations of simple patterns that give rise to complex patterns, and to reconstruct each generation in terms of construction time and palaeo-wind regime. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：作为模式分析的基本形式，可从远程图像中测量沙丘间距，缺陷密度，波峰方向和波峰长度的参数，并对新墨西哥州的白沙，加利福尼亚的Algodones，毛里塔尼亚的Agneitir和纳米比亚的纳米布。从沙丘间距和波峰长度的频率图，缺陷密度的现场规模计算以及波峰方向的玫瑰图确定统计种群。单个种群表征简单的沙丘场（白沙），而多个种群表征复合/复杂沙丘（Algodones，Namib）和复杂沙丘场（Agneitir）。随着时间的增加，沙丘场显示出沙丘间距和波峰长度的增加，缺陷密度的降低，波峰取向的更紧密聚集以及与这些参数的测量相关的方差的减小。结果与沙丘场作为自组织的复杂系统的模型一致，在该模型中，特征模式作为施工时间的函数而出现。由于模式演变是时间的函数，因此有可能使用模式分析来增强当前的年龄确定方法。可以将统计定义的种群用于地貌反演中，以堆叠生成复杂模式的简单模式世代，并根据构造时间和古风体制重建每一代。版权所有（c）2006 John Wiley＆Sons，Ltd.

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