Field migration rates of tidal meanders recapitulate fluvial morphodynamics.
Field migration rates of tidal meanders recapitulate fluvial morphodynamics.
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DOI：
10.1073/pnas.1711330115
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发表时间：
2018-02-13
影响因子：
11.1
通讯作者：
D'Alpaos A
中科院分区：
文献类型：
--
作者：
Finotello A;Lanzoni S;Ghinassi M;Marani M;Rinaldo A;D'Alpaos A
曲折的潮汐通道网络在它们穿过的景观的生态形态动力学演化中起着核心作用。尽管他们无处不在的存在和沉积和景观特征的相关性，潮汐曲流演化的观察很少存在，我们缺乏充分的了解的管理过程。现场分析表明，潮汐曲流，传统上被视为稳定的景观特征，显示模式的迁移和迁移率每单位宽度非常相似的河流对应的特点，具有重要的影响，相关的沉积产物的表征。本文的结果有助于我们理解潮汐景观的形态演化。大部分潮汐通道具有明显的弯曲特征。尽管它们在油藏形成和潮汐景观形态的重要性，问题仍然存在于潮汐曲流动力学是否可以理解的河流过程和理论。关键的差异表明，否则，像周期性逆转的潮汐形成的潮汐流和广泛接受的经验概念，潮汐河曲是稳定的景观特征，与他们的迁移河流形成鲜明对比。相反，在这里，我们表明，一旦适当规范化，观察到的迁移率的潮汐和河流曲流是非常相似的。标准化的关键是潮汐通道宽度的作用，它对潮汐形成流速和潮汐棱镜的强烈空间梯度作出反应。我们发现潮汐河曲的迁移动力学与河曲演化的非线性理论一致。我们的研究结果挑战了传统的观点，潮汐通道稳定的景观功能，并建议，曲折的潮汐通道概括了许多河流的同行，由于大梯度的潮汐棱镜横跨曲折的波长。
Meandering tidal channel networks play a central role in the ecomorphodynamic evolution of the landscapes they cut through. Despite their ubiquitous presence and relevance to sedimentary and landscape features, few observations of tidal-meander evolution exist, and we lack a full understanding of the governing processes. Field analyses show that tidal meanders, traditionally viewed as stable landscape features, display modes of migration and migration rates per unit width quite similar to those characterizing their fluvial counterparts, with important implications for the characterization of the related sedimentary products. The results presented here contribute to our understanding of the morphological evolution of tidal landscapes. The majority of tidal channels display marked meandering features. Despite their importance in oil-reservoir formation and tidal landscape morphology, questions remain on whether tidal-meander dynamics could be understood in terms of fluvial processes and theory. Key differences suggest otherwise, like the periodic reversal of landscape-forming tidal flows and the widely accepted empirical notion that tidal meanders are stable landscape features, in stark contrast with their migrating fluvial counterparts. On the contrary, here we show that, once properly normalized, observed migration rates of tidal and fluvial meanders are remarkably similar. Key to normalization is the role of tidal channel width that responds to the strong spatial gradients of landscape-forming flow rates and tidal prisms. We find that migration dynamics of tidal meanders agree with nonlinear theories for river meander evolution. Our results challenge the conventional view of tidal channels as stable landscape features and suggest that meandering tidal channels recapitulate many fluvial counterparts owing to large gradients of tidal prisms across meander wavelengths.
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影响因子：
5.4
作者：
HOWARD, AD;KNUTSON, TR
通讯作者：
KNUTSON, TR
影响因子：
3.5
作者：
Ghinassi, Massimiliano;D'alpaos, Andrea;Cantelli, Alessandro
通讯作者：
Cantelli, Alessandro
DOI：
10.1073/pnas.1301552110
发表时间：
2013-03-19
影响因子：
11.1
作者：
Giometto, Andrea;Altermatt, Florian;Rinaldo, Andrea
通讯作者：
Rinaldo, Andrea
影响因子：
3.9
作者：
D'Alpaos, Andrea;Lanzoni, Stefano;Rinaldo, Andrea
通讯作者：
Rinaldo, Andrea
影响因子：
4.2
作者：
D'Alpaos, Andrea;Ghinassi, Massimiliano;Marani, Marco
通讯作者：
Marani, Marco