Understanding the background wave-in-ice signal for improved ice profiler performance

了解冰中背景波信号以提高冰剖面仪性能

• 批准号: 538406-2019
• 负责人: Klymak, Jody
• 金额: $ 1.82万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681265
• 关键词: Understanding; background; wave; ice; signal

The decreased summer ice extent has opened wide regions of the Arctic for the generation of surface waves. Wave heights of more than 5m are now observed regularly in the Western Arctic. The waves constitute an increasing thread of coastal erosion, affecting marine operations and shipping, and have a profound impact on the annual break-up and re-freezing of the ice cover. The physics of wave propagating into ice are complex, and include reflection at the ice edge, viscous dampening of mainly shorter wave length, flexural transmission and thus non-linear transformation of basic wave properties like wave length and wave period.ASL has been providing observational equipment and data analysis for ice monitoring in the Arctic for over 40 years. A key instrument developed at ASL is the Ice Profiler Sonar (IPS). In this project, we will develop algorithms to extend the IPS capabilities to include wave-in-ice processes. Several years of IPS data provide the basis for understanding the various wave processes present in IPS data, and to develop improved algorithm, ultimately allowing the adaptation of the IPS to the emerging, seasonally ice-free Arctic.

夏季冰层面积的减少为产生表面波打开了北极广阔的区域。现在经常在北极西部观测到超过5米的海浪高度。海浪构成了日益严重的海岸侵蚀，影响着海洋作业和航运，并对每年的冰盖破裂和重新冻结产生深远影响。波在冰内传播的物理过程是复杂的，包括冰边反射、主要是短波长的粘性阻尼、弯曲传播以及由此产生的波长、波周期等基本波性质的非线性变换。40多年来，ASL一直为北极的冰监测提供观测设备和数据分析。ASL开发的一项关键仪器是冰廓线声纳（IPS）。在这个项目中，我们将开发算法来扩展IPS功能，以包括冰中波过程。几年的IPS数据为理解IPS数据中出现的各种波浪过程提供了基础，并开发了改进的算法，最终允许IPS适应新兴的、季节性无冰的北极。