Collaborative Research: ABR: Multiscale Dynamics in Explosive Volcanic Eruptions
合作研究:ABR:火山喷发的多尺度动力学
基本信息
- 批准号:1144198
- 负责人:
- 金额:$ 18万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2012
- 资助国家:美国
- 起止时间:2012-07-01 至 2016-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Explosive volcanic eruptions are some of the most energetic granular flows on the planet, the largest of which can have global impact. Even the more common, smaller, events encompass scales of several kilometers. However, mass and energy transfer in these flows are fundamentally controlled by processes at much smaller spatial and temporal scales, where individual particles interact with each other, with gas, or with the surface over which the flows travel. Our past work on steam explosions, ash production, and heat transfer have shown that subgrid models developed from experiments can be coupled to large-scale numerical simulations. More importantly, these subgrid relations are critical for predicting the dynamics reflected in volcanic deposits and in ash dispersal patterns; models that neglect subgrid processes can fail to produce the energy transfer manifest in volcanic deposits by several orders of magnitude. Our ability to predict large-scale behavior of volcanic flows can ultimately be limited by our understanding of very small-scale, or microphysical, processes. In this study, the investigators will examine a suite of particle-scale mass and energy transfer mechanisms in the laboratory with the aim of understanding the physics of these processes and to incorporate them into large-scale simulations of explosive volcanic eruptions. This project will support an ongoing effort in predictive computational volcanology. Specifically they team will focus on 1) heat transfer between particles and gas at high Reynolds numbers and using clast cooling proxies to examine entrainment in pyroclastic density currents, 2) particle deposition and resuspension, including the role of particle impacts in generating depositional features, 3) large-scale experiments of gas-particle density driven flows, and 4) and the production of fine ash particles in the conduit and in pyroclastic density currents. All these processes contribute to production and dispersal of ash and larger pyroclasts to the immediate environment of the volcanic edifice and also to the wider dispersal of ash in the atmosphere. Understanding the physics of these processes is crucial in determining the potential aviation, climactic, and local hazards of eruptions. All of the proposed experiments will be conducted with materials and at conditions similar to those in natural flows, minimizing the potential difficulties with scaling to large-scale multiphase flows. In the methodology proposed, the numerical models are integrally connected to the experimental data. The strength of numerical models is the ability to solve non-linear, complexly coupled equations and determine emergent behavior, and the strength of the experiments is to understand in detail the physical processes operating at small scales.
火山爆发是地球上最具活力的颗粒流之一,其中最大的一次可以产生全球影响。即使是更常见、更小的事件,规模也有几公里。然而,这些流动中的质量和能量传递基本上是由小得多的空间和时间尺度上的过程控制的,在这些过程中,单个粒子彼此相互作用,与气体相互作用,或者与流动所经过的表面相互作用。我们过去在蒸汽爆炸、灰烬产生和传热方面的工作表明,从实验中开发的亚网格模型可以与大规模数值模拟相结合。更重要的是,这些次网格的关系是至关重要的预测反映在火山沉积物和火山灰扩散模式的动态,忽略次网格过程的模型可能无法产生几个数量级的火山沉积物中的能量转移表现。我们预测火山流大规模行为的能力最终会受到我们对非常小规模或微物理过程的理解的限制。在这项研究中,研究人员将在实验室中研究一套粒子尺度的质量和能量转移机制,目的是了解这些过程的物理学,并将其纳入爆炸性火山爆发的大规模模拟中。该项目将支持预测计算火山学的持续努力。具体来说,他们的团队将专注于1)在高雷诺数下颗粒和气体之间的热传递,并使用碎屑冷却代理来检查火山碎屑密度流中的夹带,2)颗粒沉积和再悬浮,包括颗粒撞击在生成沉积特征中的作用,3)气体颗粒密度驱动流的大规模实验,和4)以及在管道和火山碎屑密度流中产生细灰颗粒。所有这些过程都有助于火山灰和较大的火山碎屑的产生和散布到火山建筑物的直接环境中,也有助于火山灰在大气中更广泛的散布。了解这些过程的物理特性对于确定火山爆发的潜在航空、气候和局部危害至关重要。 所有拟议的实验都将使用与自然流动相似的材料和条件进行,最大限度地减少了缩放到大规模多相流的潜在困难。在所提出的方法中,数值模型是完整地连接到实验数据。数值模型的优势在于能够求解非线性、复杂耦合的方程并确定涌现行为,而实验的优势在于能够详细了解小尺度下的物理过程。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Michael Manga其他文献
Exposed columns in the Valles Caldera ignimbrites as records of hydrothermal cooling, Jemez Mountains, New Mexico, USA
- DOI:
10.1016/j.jvolgeores.2022.107536 - 发表时间:
2022-06-01 - 期刊:
- 影响因子:
- 作者:
Stephen Self;Noah Randolph-Flagg;John E. Bailey;Michael Manga - 通讯作者:
Michael Manga
A gas-tight shock tube apparatus for laboratory volcanic lightning under varying atmospheric conditions
用于不同大气条件下实验室火山闪电的气密激波管装置
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
∗. ChristinaSpringsklee;B. Scheu;Christoph Seifert;Michael Manga;C. Cimarelli;Damian Gaudin;Oliver Trapp;Donald Bruce Dingwell - 通讯作者:
Donald Bruce Dingwell
Fracture penetration in planetary ice shells
- DOI:
10.1016/j.icarus.2008.10.010 - 发表时间:
2009-02-01 - 期刊:
- 影响因子:
- 作者:
Maxwell L. Rudolph;Michael Manga - 通讯作者:
Michael Manga
Strike-slip fault patterns on Europa: Obliquity or polar wander?
- DOI:
10.1016/j.icarus.2010.11.002 - 发表时间:
2011-01-01 - 期刊:
- 影响因子:
- 作者:
Alyssa Rose Rhoden;Terry A. Hurford;Michael Manga - 通讯作者:
Michael Manga
The challenges of driving Charon's cryovolcanism from a freezing ocean
- DOI:
10.1016/j.icarus.2022.115391 - 发表时间:
2023-03-01 - 期刊:
- 影响因子:
- 作者:
Alyssa Rose Rhoden;Maxwell L. Rudolph;Michael Manga - 通讯作者:
Michael Manga
Michael Manga的其他文献
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{{ truncateString('Michael Manga', 18)}}的其他基金
Particle clustering in dilute pyroclastic density currents and plumes
稀火山碎屑密度流和羽流中的颗粒聚集
- 批准号:
2042173 - 财政年份:2021
- 资助金额:
$ 18万 - 项目类别:
Continuing Grant
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合作研究:黄石间歇泉的地下管道、震颤迁移和喷发周期
- 批准号:
2116573 - 财政年份:2021
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
EAGER Collaborative Research: Testing a new sensor for short term and long term measurement of heat flow in lakes
EAGER 协作研究:测试用于短期和长期测量湖泊热流的新传感器
- 批准号:
2041397 - 财政年份:2020
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
Collaborative Research: Exploring the Magmatic, Crustal, and Conduit Conditions Required for Mafic, Plinian Volcanism
合作研究:探索镁铁质、普林尼式火山活动所需的岩浆、地壳和管道条件
- 批准号:
1831213 - 财政年份:2018
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
ABR: Field, Laboratory, and Numerical Studies of Geyser Eruptions
ABR:间歇泉喷发的现场、实验室和数值研究
- 批准号:
1724986 - 财政年份:2017
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
Collaborative Research: Residual Stress Preserved in Crystals from Volcanic Eruptions
合作研究:火山喷发晶体中保存的残余应力
- 批准号:
1724469 - 财政年份:2017
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
Collaborative Research: Flood volcanism and environmental impacts -- A multidisciplinary investigation of the Deccan Traps and events at the Cretaceous-Paleogene boundary
合作研究:洪水火山活动和环境影响——对德干地盾和白垩纪-古近纪边界事件的多学科调查
- 批准号:
1615203 - 财政年份:2016
- 资助金额:
$ 18万 - 项目类别:
Continuing Grant
Collaborative Proposal: Experimental Studies of Dilute Pyroclastic Density Currents
合作提案:稀火山碎屑密度流的实验研究
- 批准号:
1447559 - 财政年份:2015
- 资助金额:
$ 18万 - 项目类别:
Standard Grant
RAPID: Hydrological responses to the August, 2014, Napa earthquake
RAPID:2014 年 8 月纳帕地震的水文响应
- 批准号:
1463997 - 财政年份:2015
- 资助金额:
$ 18万 - 项目类别:
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Collaborative research: Origin of hydrologic responses to earthquakes: constraints from New Zealand, Taiwan, Chile, and USA
合作研究:地震水文响应的起源:新西兰、台湾、智利和美国的限制
- 批准号:
1344424 - 财政年份:2014
- 资助金额:
$ 18万 - 项目类别:
Continuing Grant
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