Nearshore ice complex breakup is controlled by a balance between thermal and mechanical processes
Nearshore ice complex breakup is controlled by a balance between thermal and mechanical processes
复制标题
近岸冰复合体的破裂是由热过程和机械过程之间的平衡控制的
DOI：
10.1002/esp.5698
复制
发表时间：
2023
影响因子：
3.3
通讯作者：
Rawling, III, J. Elmo
中科院分区：
文献类型：
--
作者：
Theuerkauf, Ethan J.;Zoet, Lucas K.;Dodge, Stefanie E.;Tuttle, William;Rawling, III, J. Elmo
海岸冰是寒冷气候海岸地貌的一个重要方面，但与其他方面（如近海岸水动力学）相比，通常研究不足。气候变化正在导致更动态的海岸冰态（即，冰季缩短和多次冻融循环）;因此，需要清楚地了解海岸在沿海地貌演变中的作用。一般认为，海岸冰的存在为海岸提供了一个抵御风暴波浪的保护缓冲区，尽管一些研究表明，与冰的发展相关的海岸侵蚀和沉积物输运增强。这一点在海岸的破碎阶段尤为明显，因为沉积物可以从海床上冲刷下来，就地沉积，或被输送到海上。鉴于此，了解海岸冰破裂的机制至关重要。本研究记录了导致海岸冰破裂的物理条件的第一次现场和实验室联合评估，详细说明了冰恶化中热和机械过程之间的复杂相互作用。通过波浪水槽实验以及现场观测，单独的波浪冲击不太可能导致海岸冰破裂，需要进行热弱化。这对预测冰何时破裂以及确定潜在的近岸沉积物输送途径都具有重要意义。如果冰完全由于热降解而破裂，那么沉积物可能会沉积在原地，而如果冰由于热降解和波浪冲击的结合而破裂，那么沉积物可能会重新分布在整个海岸表面。监测冰破裂期间的气象条件可能被用作由海岸冰恶化引起的地貌变化的一阶预测器。
Shore ice is an important facet of cold‐climate coastal geomorphology yet is generally understudied in comparison to other aspects such as nearshore hydrodynamics. Climate change is resulting in more dynamic shore ice regimes (i.e., shortened ice season and multiple freeze–thaw cycles); thus, a clear understanding of the role of shore ice in coastal geomorphic evolution is needed. The presence of shore ice is generally thought to provide the coast a protective buffer from storm waves though some studies have indicated enhanced nearshore erosion and sediment transport associated with ice development. This is particularly apparent during the breakup phase of shore ice as sediment can be scoured from the bed, deposited in place, or transported offshore. Given this, understanding the mechanics of shore ice breakup is critical. This study documents the first combined field and laboratory evaluation of the physical conditions leading to shore ice breakup, detailing the complex interplay between thermal and mechanical processes in ice deterioration. Through a wave tank experiment as well as field observations, wave impacts alone are shown to be unlikely to cause breakup of shore ice and thermal weakening is required. This has important implications both for predicting when ice will break up as well as for identifying potential nearshore sediment transport pathways. If ice breaks up entirely from thermal degradation, then sediment is likely to be deposited in place, whereas if ice breaks up from a combination of thermal degradation and wave impact, then sediment can be redistributed across the shoreface. Monitoring of meteorological conditions during ice breakup can likely be used as a first‐order predictor of geomorphic changes resulting from shore ice deterioration.
登录
查看更多内容
对美国密歇根湖西南部冰足复合体引起的冰筏侵蚀的评估
DOI：
--
发表时间：
1991
期刊：
影响因子：
--
作者：
J. Miner;R. Powell
通讯作者：
R. Powell
冰脊形成：近岸沙坝可能控制☆
DOI：
--
发表时间：
1976
期刊：
影响因子：
--
作者：
E. Seibel;C. Carlson;J. Maresca
通讯作者：
J. Maresca
影响因子：
2.9
作者：
Farquharson, L. M.;Mann, D. H.;Jordan, J. W.
通讯作者：
Jordan, J. W.
DOI：
--
发表时间：
1994
期刊：
影响因子：
--
作者：
D. L. Forbes;R. B. Taylor
通讯作者：
R. B. Taylor
冰对密歇根湖南部海岸侵蚀的影响
DOI：
--
发表时间：
1994
期刊：
影响因子：
--
作者：
P. Barnes;E. Kempema;E. Reimnitz;M. Mccormick
通讯作者：
M. Mccormick