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Quasi-universal length scale of river anabranches
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2022-08-11 , DOI: 10.1029/2022gl099928
Niccolò Ragno, Marco Redolfi, Marco Tubino

Looping patterns, where channels divide and reconnect further downstream, are widespread in natural rivers. Here, we build an extensive dataset of different gravel-bed and sand-bed rivers around the world encompassing a wide range of physiographic and sedimentological conditions. Field data show the existence of quasi-universal relations for the anabranches length when scaled with bankfull hydraulic geometry variables of the main upstream channel. The dimensionless length is found to be nearly slope-invariant, identifying a clear difference with respect to deltaic systems. This scaling relationship is explained by interpreting the dynamics of river loops as basically controlled by a two-way interaction between their constitutive elements, bifurcations and confluences. The identification of a quasi-universal length scale provides insight on the morphological evolution of multi-thread networks and constitutes a key information for the design of self-sustaining river restoration interventions.

中文翻译:

河流分流的准通用长度尺度

天然河流中普遍存在循环模式,即渠道在下游进一步分流和重新连接。在这里,我们建立了世界各地不同砾石床和沙床河流的广泛数据集,涵盖了广泛的自然地理和沉积学条件。现场数据表明,当与主要上游河道的满岸水力几何变量进行比例缩放时,分支长度存在准普遍关系。发现无量纲长度几乎是斜率不变的,确定了与三角洲系统的明显差异。这种比例关系是通过将河流循环的动力学解释为基本上由它们的构成元素、分叉和汇合之间的双向相互作用来解释的。
更新日期:2022-08-13
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