Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

2013 Colorado Front Range Flood: Debris-Flow a Major Hazard

30.09.2014

Massive flooding in Colorado in September 2013, and the concomitant landslides and debris flows, caused widespread damage across the Front Range.

In the October issue of GSA Today, Jeffrey Coe, Jason Kean, Jonathan Godt, Rex Baum, and Eric Jones at the U.S. Geological Survey; David Gochis at the National Center for Atmospheric Research; and Gregory Anderson of the Boulder Mountain Fire Protection District present insights on hazard assessment gained from this extraordinary debris-flow event.


House damaged by a September 2013 debris flow in Big Thompson Canyon in the Colorado Front Range; deposit (foreground) covers U.S. Highway 34. Photo by Jonathan Godt, 20 Sept. 2013.

Between 9 and 13 September 2013, more than 1,100 debris flows occurred in an area of about 3,400 square kilometers, most of which were triggered by two periods of intense rainfall: one lasting 12.5 hours on 11–12 September, with a maximum 10-minute intensity of 67 mm/hour, the other lasting 8 hours on 12 September, with a maximum intensity of 39 mm/hour.

Almost all of the flows were initiated on steep (greater than 25 degrees), south- and east-facing canyon and hogback slopes with upslope contributing areas of more than 3,300 square meters, the largest at elevations above 2600 m. Areal concentrations of the flows show that colluvial soils on sedimentary rocks were more susceptible than soils on crystalline rocks.

This major flooding event serves as an alert to authorities and residents in the Front Range and other interior continental areas with steep slopes. In these locations, widespread debris flows are unusual -- yet their threat may be all the greater because of their infrequency.

ARTICLE
New insights into debris-flow hazards from an extraordinary event in the Colorado Front Range
Jeffrey A. Coe et al., U.S. Geological Survey, Denver Federal Center, MS 966, Denver, Colorado 80215, USA. Pages 4–10; doi: 10.1130/GSATG214A.1.

GSA Today articles are open access online; for a print copy, please contact Kea Giles at the address above. Please discuss articles of interest with the authors before publishing stories on their work, and please make reference to GSA Today in articles published.

Contact:
Kea Giles
Managing Editor,
GSA Communications
+1-303-357-1057
kgiles@geosociety.org

Kea Giles | Eurek Alert!
Further information:
http://www.geosociety.org/news/pr/2014/14-68.htm

More articles from Earth Sciences:

nachricht NASA's AIM observes early noctilucent ice clouds over Antarctica
05.12.2016 | NASA/Goddard Space Flight Center

nachricht GPM sees deadly tornadic storms moving through US Southeast
01.12.2016 | NASA/Goddard Space Flight Center

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

IHP presents the fastest silicon-based transistor in the world

05.12.2016 | Power and Electrical Engineering

InLight study: insights into chemical processes using light

05.12.2016 | Materials Sciences

High-precision magnetic field sensing

05.12.2016 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>