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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Form roughness and the absence of secondary flow in a large confluence-diffluence, Rio Parana, Argentina
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Form roughness and the absence of secondary flow in a large confluence-diffluence, Rio Parana, Argentina

机译：阿根廷里约帕拉纳市，在大的汇合处，形状粗糙且没有二次流动

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摘要

Confluence-diffluence units are key elements within many river networks, having a major impact upon the routing of flow and sediment, and hence upon channel change. Although much progress has been made in understanding river confluences, and increasing attention is being paid to bifurcations and the important role of bifurcation asymmetry, most studies have been conducted in laboratory flumes or within small rivers with width:depth (aspect) ratios less than 50. This paper presents results of a field-based study that details the bed morphology and 3D flow structure within a very large confluence-diffluence in the Rio Parana, Argentina, with a width:depth ratio of approximately 200. Flow within the confluence-diffluence is dominated largely by the bed roughness, in the form of sand dunes; coherent, channel-scale, secondary How cells, that have been identified as important aspects of the flow field within smaller channels, and assumed to be present within large rivers, are generally absent in this reach. This finding has profound implications for flow mixing rates, sediment transport rates and pathways, and thus the interpretation of confluence-diffluence morphology and sedimentology. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：汇流-扩散单元是许多河网中的关键要素，对流量和泥沙的路线，进而对河道变化产生重大影响。尽管在了解河流汇流方面已经取得了很大的进步，并且人们越来越关注分叉和分叉不对称的重要作用，但是大多数研究都是在实验室水道或宽度与深度（纵横比）小于50的小河中进行的。 。本文介绍了一项基于现场的研究结果，该研究详细描述了阿根廷里约帕拉纳（Rio Parana）非常大的汇合扩散区域内的河床形态和3D流动结构，其宽深比约为200。主要由沙丘形式的床糙度决定;在该河段通常不存在被认为是较小河道中流场的重要方面并假定存在于大型河流中的连贯的，河道规模的次要How细胞。这一发现对混流速率，沉积物传输速率和路径，以及对汇合-扩散形态和沉积学的解释都具有深远的意义。版权所有（c）2006 John Wiley＆Sons，Ltd.

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