气候变化领域集成服务门户(CCPortal): Deep and rapid thermo-mechanical erosion by a small-volume lava flow

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DOI	10.1016/j.epsl.2020.116163
	Deep and rapid thermo-mechanical erosion by a small-volume lava flow
	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.
发表日期	2020
ISSN	0012821X
卷号	537
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202592
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
推荐引用方式 GB/T 7714	Gallant E.,Deng F.,Connor C.B.,et al. Deep and rapid thermo-mechanical erosion by a small-volume lava flow[J],2020,537.
APA	Gallant E..,Deng F..,Connor C.B..,Dixon T.H..,Xie S..,...&Thompson G..(2020).Deep and rapid thermo-mechanical erosion by a small-volume lava flow.Earth and Planetary Science Letters,537.
MLA	Gallant E.,et al."Deep and rapid thermo-mechanical erosion by a small-volume lava flow".Earth and Planetary Science Letters 537(2020).