TITAN2D simulations of pyroclastic flows at Cerro Machín Volcano, Colombia: Hazard implications

Murcia, Hugo; Sheridan, M. F.; Macías, José Luis; Cortés, Gloria Patricia

doi:10.1016/j.jsames.2009.09.005

Cited by 33 publications

(31 citation statements)

References 24 publications

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“…They account for half of all deaths due to historic volcanic eruptions (Witham, 2005). Knowledge of how such currents respond to topography and changes in source fl ux is critical for the reconstruction of turbidite basin fi lls in hydrocarbon exploration (Plink-Björklund et al, 2001;Pirmez and Imran, 2003) and for anticipating hazards at volcanoes (Murcia et al, 2010). Simple models that involve instantaneous release of a prescribed volume as a single-surge fl ow (Dade and Huppert, 1996;Kelfoun, 2011) are not suitable for larger density currents that have sustained supply because in more sustained currents, fl ow velocity, thickness, concentration, mass fl ux, and direction may vary signifi cantly with time; substrate topography changes during deposition (Brown and Branney, 2013); and only a small fraction of the ultimate deposit is being transported during any one snapshot in time (Bursik and Woods, 1996;Branney and Kokelaar, 1997).…”

Section: Introductionmentioning

confidence: 99%

Temporal and spatial evolution of a waxing then waning catastrophic density current revealed by chemical mapping

Williams

Branney

Barry

2014

Geology

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We reconstruct the behavior of a catastrophic sustained radial pyroclastic density current as it waxed then waned during its brief lifespan. By subdividing the deposit into 8 time slices using a chemical tracer, we show that the sustained current initially was topographically restricted, but that its leading edge advanced in all directions, encroaching upon and gradually ascending hills. During peak fl ow the current reached its maximum extent and overtopped all topographic highs. After this, and while the current direction from source was maintained, the leading edge gradually retreated sourceward. High-resolution analysis of the depositional architecture reveals how the fl ow dynamics evolved and runout distance of the sustained density current rapidly increased then decreased, refl ecting the dominant infl uence of changing mass fl ux, as demonstrated in numerical models but not previously distinguished in a natural deposit.

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Section: Introductionmentioning

confidence: 99%

Temporal and spatial evolution of a waxing then waning catastrophic density current revealed by chemical mapping

Williams

Branney

Barry

2014

Geology

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“…이 모델은 공개된 GRASS GIS 인터페이 스에 의해 지원되는 자연 지형 수치고도자료 즉 자 연 그대로의 수치고도모델(DEM) 위에서 입자류를 수치 시뮬레이션하는 'thin layer model'을 기본으로 하고 있다 (Murcia et al, 2010). 질량과 모멘트에 대 한 보존 공식은 매질 입자와 입자상 물질 및 기저면 사이의 상호작용에 대한 쿨롬 방식 마찰 항으로 해 결된다 (Pitman et al, 2003).…”

Section: 화쇄류 화산이류 화산성홍수unclassified

A Preliminary Study for Predicting a Damage Range of Pyroclastic Flows, Lahars, and Volcanic Flood caused by Mt. Baekdusan Eruption

Kim¹,

Choi²,

Jung³

et al. 2013

Journal of the Korean earth science society

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Products of the eruption of Mt. Baekdusan are identified as volcanic materials at the estuaries of the Songhuagang river to north, the Dumangang river to east and the Amnokgang river to west. More speficially, pyroclastic flows, lahars and volcanic floods can affect an area of 400km in radius, centering around Lake Cheonji caldera. However, unlike the millenium eruption, the flow situation has been changed. Because multi-purpose dams and reserviors with a combined pondage of mora than 2 billion tons of water have been built in the rivers of which sources are originated from Lake Cheonji caldera. In addition, the flow of fluids expected to take place when the volcano has erupted is thought to be affected by artificial constructions in both direct and indirect ways. This study calculates the direction of fluids flow by using numerical analyses of pyroclastic flows, lahars and volcanic floods that can occur when the volcano of Mt. Baekdusan has erupted. We also estimate the scope of damages by pyroclastic flows, lahars, volcanic flooding caused by the pondage of the dams and water storages in and around Mt. Baekdusan. Pyroclastic flows transported over the steep slopes at the early times of eruptions move over the mountain slopes, affecting airplanes, and lahars due to leaks of Lake Cheonji could reach as far as major rivers and streams near Mt. Baekdusan. Unlike historical accounts, volcanic flood is expected to be limited in its scope of influence to reservoirs bigger than Lake Cheonji in pondage.

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“…Factors that could affect the choice of basal friction angle include the volume of the flow, the type of pyroclastic flow, the nature of the substrate and the amount of channelization. Murcia et al (2010) Volumes of pyroclastic flows at stratovolcanoes typically cover a few orders of magnitude. The volume values in this study bracket the range of possible pyroclastic flows for both Mammoth and Galeras.…”

Section: (C) Model Set-upmentioning

confidence: 99%

“…Several studies have explored the use of computational fluid dynamics (CFD) models to produce volcanic hazard maps for a variety of phenomena at a number of volcanoes (Hooper et al 2003;Stinton et al 2006;Murcia et al 2010;Procter et al 2010;Sheridan et al 2010). Hazard maps for ground-hugging flows that are *Author for correspondence (ers32@buffalo.edu).…”

Section: Introductionmentioning

confidence: 99%

Digital elevation model uncertainty and hazard analysis using a geophysical flow model

et al. 2012

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This paper describes a new methodology to quantify the variation in the output of a computational fluid dynamics model for block and ash flows, when the digital elevation model (DEM) of the terrain and other inputs are given as a range of possible values with a prescribed uncertainty. Integrating these variations in the possible flows as a function of input uncertainties provides well-defined hazard probabilities at specific locations, i.e. a hazard map. Earlier work provided a methodology for assessing hazards based on variations in flow initiation and friction parameters. This paper extends this approach to include the effect of terrain error and uncertainty. The results are based on potential flows at Mammoth Mountain, CA, and Galeras Volcano, Colombia. The analysis establishes the soundness of the approach and the effect of including the uncertainty in DEMs in the construction of probabilistic hazard maps.

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TITAN2D simulations of pyroclastic flows at Cerro Machín Volcano, Colombia: Hazard implications

Cited by 33 publications

References 24 publications

Temporal and spatial evolution of a waxing then waning catastrophic density current revealed by chemical mapping

Temporal and spatial evolution of a waxing then waning catastrophic density current revealed by chemical mapping

A Preliminary Study for Predicting a Damage Range of Pyroclastic Flows, Lahars, and Volcanic Flood caused by Mt. Baekdusan Eruption

Digital elevation model uncertainty and hazard analysis using a geophysical flow model

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