globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116163
论文题名:
Deep and rapid thermo-mechanical erosion by a small-volume lava flow
作者: Gallant E.; Deng F.; Connor C.B.; Dixon T.H.; Xie S.; Saballos J.A.; Gutiérrez C.; Myhre D.; Connor L.; Zayac J.; LaFemina P.; Charbonnier S.; Richardson J.; Malservisi R.; Thompson G.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 537
语种: 英语
中文关键词: heat transfer modeling ; lava flow channel ; Momotombo ; planetary analogues ; volcano morphology
英文关键词: Channel flow ; Heat transfer ; Morphology ; Volcanoes ; Hazard Assessment ; Heat transfer model ; Lava flows ; Momotombo ; Morphological process ; planetary analogues ; Substrate hardness ; Thermo-mechanical ; Erosion ; erosion ; heat transfer ; lava flow ; modeling ; pyroclastic flow ; thermomechanics ; volcanic eruption ; Leon [Nicaragua] ; Momotombo Volcano ; Nicaragua
英文摘要: We document remarkably efficient thermo-mechanical erosion by a small-volume lava flow. Downcutting by a basaltic-andesite lava flow on the steep-sided Momotombo volcano, Nicaragua, occurred at 100 times the rate commonly reported for thermal erosion in lava flow fields, even though this flow was small-volume (0.02 km3) and effused at a low rate for <1 week. The lava flow incised into the pyroclastic substrate up to 30 m, with erosion depth controlled primarily by thermal reduction of substrate hardness. We show that incision depth decreases, approximately exponentially, with distance along the flow path, until erosion stopped and the flow became constructional. This transition occurs 650 m from the vent on a slope averaging a 32∘ incline. Results indicate that syn-eruptive erosion is an important morphological process on some steep-sided volcanoes that are predominantly composed of layered pyroclasts. Rapid erosion and incision increased flow run-out for the 1905 flow, which in turn directed the flow and run-out of the 2015 lava flow. Mapping and understanding these features is critical for improving lava flow hazard assessments and provides insight into the construction and growth of composite cones. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164970
Appears in Collections:气候变化与战略

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作者单位: University of South Florida, School of Geosciences, United States; University of Cambridge, Department of Geography, United Kingdom; Instituto Nicaragüense de Estudios Territoriales, Nicaragua; University of South Florida, College of Marine Science, United States; Earth and Environmental Sciences Program, The Graduate Center, City University of New York, United States; Pennsylvania State University, Department of Geosciences, United States; NASA Goddard Space Flight Center, United States; University of Maryland, Department of Astronomy, United States

Recommended Citation:
Gallant E.,Deng F.,Connor C.B.,et al. Deep and rapid thermo-mechanical erosion by a small-volume lava flow[J]. Earth and Planetary Science Letters,2020-01-01,537
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