Skip to main content
Article thumbnail
Location of Repository

Modeling lahars using Titan2D for the southern drainage of Volcan Cotopaxi: impact on the city of Latacunga

By Rebecca Williams

Abstract

Lahars triggered by mobilization of deposits from volcanic explosions have occurred at Volcán Cotopaxi, Ecuador on the average of once every century over the last two millennia. Lahars from Cotopaxi may flow down three main drainages, impacting a present day population of around 3 million inhabitants. Río Cutuchi, the main drainage to the south of Cotopaxi, headwaters on the flanks of Rumiñahui and Cotopaxi Volcanoes. This river flows southwards through several communities, including the city of Latacunga (population 52,000). Its path is generally parallel to the Pan American highway. Many small scale lahars have followed this drainage, as well as some large scale historical flows, such as the great 1877 debris flow that severely impacted the population along the Río Cutuchi. This study used the Titan2D model to simulate lahars of various volumes that correspond to actual deposits along the Río Cutuchi in the vicinity of Latacunga. The purpose was to investigate the hazard that lahars might present to the current population should Cotopaxi become active again and produce debris flows. The study area is restricted to the region adjacent to Latacunga where detailed field data are compared with the model results. Simulations utilized topographic, stratigraphic, and historical inundation data collected in the field in the summer of 2005 to determine probabilistic lahar inundation zones for the debris flows of various sizes. These inundation zones have been analyzed in conjunction with infrastructure data for Latacunga so that the impact of various scale lahars on the city can be assessed

Publisher: Graduate School of the State University of New York at Buffalo
Year: 2006
OAI identifier: oai:lra.le.ac.uk:2381/854

Suggested articles

Citations

  1. (2004). Risk from lahars in the northern valleys of Cotopaxi Volcano (Ecuador), doi
  2. (2005). Los peligros volcánicos asociados con el Cotopaxi, Corporación Editora Nacional,
  3. (1996). Lahars in the Pasig-Potrero River System.
  4. (1991). mud: eruptions and lahars doi
  5. (1992). Reconstruction and numerical simulation of the lahar of the 1877 eruption of Cotopaxi Volcano (Ecuador).
  6. (1995). Chronology and dispersal characteristics of recently (last 5000 years) erupted tephra of Cotopaxi (Ecuador): implications for long-term eruptive forecasting. doi
  7. (1984). Physical geomorphology of debris flows. doi
  8. (1988). Rheologic, geomorphic, and sedimentologic differentiation of water floods, hyperconcentrated flows, and debris flows. In:
  9. (1997). Hydraulic modeling for lahar hazards at Cascades volcanoes, doi
  10. (2006). Problems and lessons learned at the Soufrière Hills Volcano,
  11. (1988). The National Weather Service DAMBRK Model: Theoretical background/user documentation. Hydraulic Research Laboratory, National Weather Service, Silver Spring,
  12. (1997). The physics of debris flows. doi
  13. (1998). Objective delineation of lahar inundation zones. doi
  14. (1992). Numerical simulations of some lahars from Mt St Helens. doi
  15. (1989). Snow and ice perturbation during historical volcanic eruptions and formation of lahars and floods. doi
  16. (2006). Source process of very-long-period events accompanying long-period signals at doi
  17. (1991). Lahars of Cotopaxi Volcano, Ecuador: Hazard and risk evaluation. doi
  18. (1998). Geohazrds: Natural and man-made.
  19. (2006). Cotopaxi Volcano and the surrounding valleys. Intra-meeting Field Trip Guide.
  20. (1992). Two-dimensional waterflood and mudflow simulation.
  21. (1980). Erosion and deposition by debris flows at Mt.Thomas, doi
  22. (1985). Initiation and flow behavior of the 1980 Pine Creek and Muddy River lahars, Mount St. Helens, Washington. doi
  23. (1987). A rheologic classification of subaerial sedimentwater flows, in Debris Flows/Avalanches:Process, Recognition, doi
  24. (2005). A two-fluid model for avalanche and debris flows. doi
  25. (2006). Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.
  26. (2006). Anomalous activity at Cotopaxi studied with integrated seismic, thermal and visual observations.
  27. (1989). Origin and early evolution of lahar channel at Mabinet, doi
  28. (2005). An assessment of the SRTM topographic products.
  29. (1989). The motion of a finite mass ofgranular material down a rough incline. doi
  30. (1988). Origins, behavior, and sedimentology of lahars and lahar-runout flows in the Toutle-Cowlitz River system, Mount St. Helens,
  31. (1999). Rock Fall/Avalanche and breakout flow of Casita Volcano, Nicaragua, Triggered by Hurricane Mitch. Landslide News.
  32. Evaluating Titan2D mass-flow model using the 1963 Little Tahoma Peak avalanches, doi
  33. (2002). Volcanoes of the World: an Illustrated Catalog of Holocene Volcanoes and their Eruptions. Smithsonian Institution,
  34. Relacion sobre la erupcion del Cotopaxi acaecida el dia 26 de junio de 1877. Imprenta Nacional,
  35. (2003). Lahar hazard modeling at Tungurahua Volcano,
  36. (1998). Integrating variable bed friction into Titan2D mass-flow model: application to the Little Tahoma Peak avalanches,
  37. (1978). Mechanical characteristics of debris flow.
  38. (1980). Debris flow on prismatic open channel.
  39. (2000). Lahars. In: Encyclopedia of Volcanoes, H Sigurdsson (Ed in Chief), Academic Press, United States:
  40. (1990). The doi
  41. (1976). Markov Models for Repose-Period Patterns. doi
  42. Memoria sobre el Cotopaxi y su ultima erupcion acaecida el 26 de junio de 1877. Imprenta del Comercio,
  43. (2001). Instituto Nacional de Estadistica y Censos,

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.