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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Alluvial floodplain classification by multivariate clustering and discriminant analysis for low- relief glacially conditioned river catchments
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Alluvial floodplain classification by multivariate clustering and discriminant analysis for low- relief glacially conditioned river catchments

机译：基于多元聚类和判别分析的冲积洪泛平原分类法用于低浮雕冰河条件下的流域

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摘要

River classifications provide useful frameworks to understand complex fluvial landscapes and to manage freshwater ecosystems. Alluvial floodplains for rivers in low-relief glacially conditioned catchments of southern Ontario (Canada) are classified and tested using a sequence of multivariate statistical analyses. An original dataset of 109 floodplain sites is investigated using k-means clustering, principal component analysis, and discriminant analysis statistical approaches. Four primary floodplain types are proposed representing basic morphological, stratigraphical, and sedimentological characteristics. Classifications are successfully discriminated by two principal dimensions: (1) stream power-resistance; and (2) floodplain sedimentology. The latter is most efficiently represented by the availability of alluvial sand, and specifically a new variable defined as floodplain sand equivalent (FSE). Floodplain types are generally consistent with previous river classifications, however the glacial legacy requires refined classifications which account for inherited cobble bed materials and patterns of sand supply. Representing the residual variability of stream power-resistance correlations, a third explanatory dimension of sediment transport is suggested, and may explain some within-class variability in channel morphology. Balancing the opposing concepts of fluvial process domains and landform continuums, the potential for transitional floodplain types is also explored. The proposed first-order alluvial floodplain classifications provide a basis from which to further investigate geomorphological diversity within the context of complex glacial legacy effects in low-relief settings. Future research to reveal the spatial arrangement and linkages of distinct morphological groups within a regional landscape mosaic is expected to provide insights into patterns of post-glacial fluvial adjustment. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：河流分类为了解复杂的河流景观和管理淡水生态系统提供了有用的框架。对安大略省南部（加拿大）低浮冰条件下集水区河流的冲积洪泛区进行了分类，并使用一系列多元统计分析进行了测试。使用k均值聚类，主成分分析和判别分析统计方法研究了109个洪泛区站点的原始数据集。提出了四种主要的洪泛区类型，分别代表基本的形态学，地层学和沉积学特征。通过两个主要维度成功地区分了分类：（1）流功率电阻; （2）洪泛区沉积学。后者以冲积砂的有效性最有效地表示，特别是定义为洪泛区砂当量（FSE）的新变量。洪泛区类型通常与以前的河流分类保持一致，但是冰川遗产需要精细的分类，以解释继承的鹅卵石床材料和补砂方式。代表流动力-阻力相关性的剩余变异性，提出了沉积物输运的第三个解释性维度，并可能解释了河道形态内的某些类内变异性。为了平衡河流过程域和地形连续体的对立概念，还探讨了过渡洪泛区类型的潜力。拟议的一期冲积洪泛区分类为进一步研究低起伏环境下复杂的冰川遗留影响下的地貌多样性提供了基础。揭示区域冰川景观中不同形态群的空间排列和联系的未来研究有望为冰川后河床调整的模式提供见解。版权所有（c）2014 John Wiley＆Sons，Ltd.

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