Transport properties of fast ice within the nearshore

Transport properties of fast ice within the nearshore
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近岸固定冰的输运特性

DOI:
10.1016/j.coastaleng.2022.104176
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发表时间:
2022
影响因子:
4.4
通讯作者:
Hansen, D.D.
Hansen, D.D.
中科院分区:
工程技术1区
文献类型:
--
作者:
Dodge, S.E.;Zoet, L.K.;Rawling, J.E.;Theuerkauf, E.J.;Hansen, D.D.

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坚冰影响到高纬度和中纬度地区的许多海岸线,通过作为冬季风暴的保护屏障和通过沉积物夹带和运输作为侵蚀剂,塑造了海岸形态。据推测,当富含沉积物的冰被风暴波驱逐并搬运到封闭深度之外时,沉积物被永久地从近岸带走,使沿岸的系统挨饿,并促进未来的侵蚀。然而,尽管这对沿海沉积物预算的潜在影响很大,富含沉积物的冰运输的速度和机制受到很大的限制。本研究探讨了沉积物夹带过程中的快速冰,冰动员所需的机制,以及所需的力量,以打破和运输富含沉积物的冰。我们发现,库仑摩擦强度的沉积物调节的快冰系统和粘性流变的冰没有直接的机械效果。重要的是,这些结果表明,只有摩擦系数的海滩沉积物需要进行测量,以估计的阻力强度的快速冰,大大简化了评估快速冰动员和相关的沉积物运输的潜力的要求。
Fast ice affects many coastlines in high- and mid-latitude regions, shaping the coastal morphology by acting as both a protective barrier from winter storms and as an erosive agent through sediment entrainment and transport. It has been hypothesized that when sediment-rich ice is dislodged and transported beyond the depth of closure by storm waves, sediment is permanently removed from the nearshore, starving the littoral system and facilitating future erosion. However, despite this large potential impact on coastal sediment budgets, the rates and mechanisms of sediment-rich ice transport are poorly constrained. This study investigates the sediment entrainment process by fast ice, the mechanisms needed for ice mobilization, and the force needed to breakup and transport sediment-rich ice. We find that the Coulomb frictional strength of the sediment regulates the fast ice system and that the viscous rheology of the ice has no direct mechanical effect. Importantly, these results show that only the frictional coefficient of the beach sediment needs to be measured to estimate the resistive strength of the fast ice, significantly simplifying the requirements for evaluating the potential for fast ice mobilization and associated sediment transport.
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