CAREER: Fracture Mechanics of Antarctic Ice Shelves and Glaciers - Representing Iceberg Calving in Ice Sheet Models and Developing Cyberlearning Tools for Outreach

职业：南极冰架和冰川的断裂力学 - 在冰盖模型中代表冰山崩解并开发用于推广的网络学习工具

• 批准号: 1847173
• 负责人: Ravindra Duddu
• 金额: $ 55.5万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1847173&HistoricalAwards=false
• 关键词: CAREER; Fracture; Mechanics; Antarctic; Ice

Iceberg calving is a complex natural fracture process and a dominant cause of mass loss from the floating ice shelves on the margins of the Antarctic ice sheet. There is concern that rapid changes at these ice shelves can destabilize parts of the ice sheet and accelerate their contribution to sea-level rise. The goal of this project is to understand and simulate the fracture mechanics of calving and to develop physically-consistent calving schemes for ice-sheet models. This would enable more reliable estimation of Antarctic mass loss by reducing the uncertainty in projections. The research plan is integrated with an education and outreach plan that aims to (1) enhance computational modeling skills of engineering and Earth science students through a cross-college course and a high-performance computing workshop and (2) increase participation and diversity in engineering and sciences by providing interdisciplinary research opportunities to undergraduates and by deploying new cyberlearning tools to engage local K-12 students in the Metro Nashville Public Schools in computational science and engineering, and glaciology.This project aims to provide fundamental understanding of iceberg calving by advancing the frontiers in computational fracture mechanics and nonlinear continuum mechanics and translating it to glaciology. The project investigates crevasse propagation using poro-damage mechanics models for hydrofracture that are consistent with nonlinear viscous ice rheology, along with the thermodynamics of refreezing in narrow crevasses at meter length scales. It will develop a fracture-physics based scheme to better represent calving in ice-sheet models using a multiscale method. The effort will also address research questions related to calving behavior of floating ice shelves and glaciers, with the goal of enabling more reliable prediction of calving fronts in whole-Antarctic ice-sheet simulations over decadal-to-millennial time scales.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

冰山崩解是一个复杂的自然断裂过程，也是南极冰盖边缘浮冰架质量损失的主要原因。令人担忧的是，这些冰架的快速变化可能会破坏部分冰盖的稳定，并加速它们对海平面上升的贡献。该项目的目标是了解和模拟冰裂的断裂力学，并为冰盖模型开发物理一致的冰裂方案。这将减少预估中的不确定性，从而使对南极质量损失的估计更加可靠。该研究计划与一项教育和推广计划相结合，该计划旨在(1)通过跨学院课程和高性能计算研讨会提高工程和地球科学学生的计算建模技能；(2)通过向本科生提供跨学科研究机会，并通过部署新的网络学习工具，使当地的K-12学生参与进来，从而提高工程和科学的参与度和多样性计算科学与工程，以及冰川学。本项目旨在通过推进计算断裂力学和非线性连续介质力学的前沿，并将其转化为冰川学，为冰山崩解提供基本的认识。该项目利用水力压裂的孔隙损伤力学模型研究裂缝扩展，该模型与非线性粘性冰流变学相一致，并与米长尺度上狭窄裂缝中再冻结的热力学相一致。它将开发一种基于裂缝物理的方案，以便使用多尺度方法更好地表示冰盖模型中的崩解。这项工作还将解决与漂浮冰架和冰川的崩解行为有关的研究问题，其目标是在十年到千年的时间尺度上对整个南极冰盖的崩解锋进行更可靠的预测。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

A poro-damage phase field model for hydrofracturing of glacier crevasses

• DOI: 10.1016/j.eml.2021.101277
• 发表时间: 2021-03
• 期刊: Extreme Mechanics Letters
• 影响因子: 4.7
• 作者: Xiangming Sun;R. Duddu;Hirshikesh

A stress-based poro-damage phase field model for hydrofracturing of creeping glaciers and ice shelves

• DOI: 10.1016/j.engfracmech.2022.108693
• 发表时间: 2022-08
• 期刊: ArXiv
• 作者: Theo Clayton;R. Duddu;Martin Siegert;E. Martínez-Pañeda

A Finite-Element-Based Cohesive Zone Model of Water-Filled Surface Crevasse Propagation in Floating Ice Tongues

基于有限元的浮冰舌充水表面裂隙扩展的粘性带模型

• DOI: 10.1109/mcse.2023.3315661
• 发表时间: 2023
• 期刊: Computing in Science & Engineering
• 影响因子: 2.1
• 作者: Gao, Yuxiang;Ghosh, Gourab;Jiménez, Stephen;Duddu, Ravindra
• 通讯作者: Duddu, Ravindra

CNN-Based Surrogate for the Phase Field Damage Model: Generalization across Microstructure Parameters for Composite Materials

• DOI: 10.1061/jenmdt.emeng-6936
• 发表时间: 2023-06
• 期刊: Journal of Engineering Mechanics
• 影响因子: 3.3
• 作者: Yuxiang Gao;Matthew Berger;R. Duddu

A non-local continuum poro-damage mechanics model for hydrofracturing of surface crevasses in grounded glaciers

• DOI: 10.1017/jog.2020.16
• 发表时间: 2020-04
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: R. Duddu;S. Jiménez;J. Bassis