美国德克萨斯大学奥斯汀分校Mariel D. Nelson团队发现与月球和地球上的其他蜿蜒河道相比，冲积蜿蜒河流的上游弯曲偏斜很明显。相关论文于2025年3月3日发表在《地质学》杂志上。

蜿蜒河道遍布太阳系，由许多不同的过程形成。这些河道之间的定性相似性导致了一种假设，即河道曲折性的某些或全部方面是普遍的。弯曲河道形状的一个方面是其弯曲的偏斜，冲积弯曲的河流被认为主要具有上游偏斜的弯曲。

研究组提出了新的观测结果来检验蜿蜒河道弯曲偏斜的普遍性，比较了月球火山河道（蜿蜒溪流）的294个弯曲、天然和实验性融冰河道的466个弯曲以及冲积蜿蜒河流的2766个弯曲。研究结果表明，与冲积曲流河相比，由热侵蚀形成的蜿蜒溪流和冰道具有较低的振幅弯曲和较高的下游偏斜弯曲比例。在弯曲的细沟和冰道中，下游弯曲偏斜的这种更大趋势可能是弯曲生长有限和/或缺乏沉积物运输驱动的形态动力学反馈的结果，这些反馈放大了上游偏斜。

附：英文原文

Title: Upstream bend skewing in alluvial meandering rivers is distinct compared to other sinuous channels on the Moon and Earth

Author: Juan A. Vazquez, Timothy A. Goudge, Mariel D. Nelson

Issue&Volume: 2025-03-03

Abstract: Sinuous channels occur across the Solar System, forming by many distinct processes. Qualitative similarities between these channels have led to hypotheses that some, or all, aspects of channel sinuosity are universal. One aspect of the shape of sinuous channels is the skewness of their bends, with alluvial meandering rivers thought to have dominantly upstream skewed bends. We present new observations to test the universality of sinuous channel bend skewness, comparing 294 bends from lunar volcanic channels (sinuous rilles), 466 bends from natural and experimental ice melt channels, and 2766 bends from alluvial meandering rivers. Our results show that sinuous rilles and ice channels, which both form by thermal erosion, have lower-amplitude bends and a higher proportion of downstream skewed bends compared to alluvial meandering rivers. This greater tendency for downstream bend skewing in sinuous rilles and ice channels may be the result of limited bend growth and/or the lack of sediment transportdriven morphodynamic feedbacks that amplify upstream skewing.

DOI: 10.1130/G52706.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52706.1/652506/Upstream-bend-skewing-in-alluvial-meanderingredirectedFrom=fulltext