Kettner

Extreme floods, like those caused by Hurricane Helene, are becoming more frequent

Anonymous — Wed, 09 Oct 2024 17:12:08 +0000

Extreme floods, like those caused by Hurricane Helene, are becoming more frequent Anonymous (not verified) Wed, 10/09/2024 - 11:12

Gabe Allen

Late last month, Hurricane Helene drenched the Southwest United States. Devastating floods hit communities in the Gulf Coast and Southern Appalachia. The storm killed more than 200 people and destroyed billions of dollars of property.

As relief efforts begin to put the pieces back together, many are left wondering if the norms of extreme weather in America have changed. Was this unprecedented storm a freak occurrence or a new precedent?

Albert Kettner is the associate director of INSTAAR and the director of the DFO Flood Observatory (formerly the Dartmouth Flood Observatory). Since he took over the observatory in 2019, Kettner has tracked precipitation, drought and flooding around the world. His observations are built on the foundations laid by INSTAAR Senior Research Scientist Robert Brakenridge, who founded the observatory in 1993.

According to Kettner’s data, extreme floods like the ones that hit Appalachia last month have become more common in the 21st century.

Number of large and extreme floods on an annual basis from 1985 to 2020 (Credit: Robert Brakenridge). For comparison, the Appalachia floods caused by Hurricane Helene in 2024 were in the extreme category. Flood magnitude =LOG(Duration x Severity x Affected Area). The graph is based on data from the DFO Flood Observatory, accessible at https://floodobservatory.colorado.edu/Archives/.

It’s not the case that the world is getting wetter, in fact many places are becoming more arid. Rather, really big floods, which were previously rare, are happening more often.

According to Kettner, the reasons behind this are hard to parse out. In some cases, it could be that warmer air temperatures allow the atmosphere to hold more moisture. In other cases, extreme flooding might be driven by urban infrastructure that lacks adequate drainage. Most of the underlying causes of catastrophic floods boil down to two categories: climate change and human changes to the landscape.

“Flooding is both a derivative of precipitation and the area where that precipitation is landing,” Kettner explained.

As the climate continues to shift, so too will patterns of extreme weather. Amidst this uncertainty, tools like the DFO Flood Observatory can also help humanity better respond to natural disasters. Kettner has leveraged his expertise in flood tracking to create inundation maps for the United Nations World Food Programme in the past. He hopes to foster more collaboration between aid organizations and the observatory in the future.

If you have questions about this story, or would like to reach out to INSTAAR for further comment, you can contact Senior Communications Specialist Gabe Allen at gabriel.allen@colorado.edu.

Have the norms of extreme weather in America changed? DFO Flood Observatory director Albert Kettner explains that catastrophic floods have become more common in the 21st century. The reasons behind this shift are complex — invoking climate change, urban infrastructure and human impacts on ecosystems and landscapes.

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Photo: Devastation in Asheville NC after Hurricane Helene. Bill McMannis, CC BY 2.0, via Wikimedia Commons

Albert Kettner steps into INSTAAR acting director role

Anonymous — Tue, 18 Jul 2023 21:52:09 +0000

Albert Kettner steps into INSTAAR acting director role Anonymous (not verified) Tue, 07/18/2023 - 15:52

Albert Kettner

Albert Kettner, associate research professor and associate director of INSTAAR, has stepped into the role of acting director of INSTAAR as of July 10.

Kettner will provide leadership as our previous director, Merritt Turetsky, returns to faculty to focus on her research, teaching, and public engagement.

Turetsky’s dedication and guidance as director of INSTAAR have been instrumental in steering the institute through challenging times, including the unprecedented difficulties posed by the pandemic. Her unwavering commitment to promoting equity and inclusion within the institute has been instrumental in making positive change.

The Research & Innovation Office will be coordinating with INSTAAR leadership to guide the process to appoint an interim and then a permanent director.

Albert Kettner, associate research professor and associate director of INSTAAR, has stepped into the role of acting director of INSTAAR as of July 10.

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CU �鶹ӰԺ team granted $2.56M to transform Earth surface science (CIRES)

Anonymous — Tue, 07 Dec 2021 07:00:00 +0000

CU �鶹ӰԺ team granted $2.56M to transform Earth surface science (CIRES) Anonymous (not verified) Tue, 12/07/2021 - 00:00

The National Science Foundation has awarded a highly competitive grant to a team of scientists building OpenEarthScape, a set of models and simulations to help anticipate changes in river flow, beach erosion, landslides and more. The $2.56M grant will support five years of work by earth surface scientists, including modelers, who are determined to better understand the forces that re-shape our landscapes over hours to epochs. Eric Hutton, Albert Kettner, Irina Overeem, Mark Piper are co-PIs on the grant.

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Study finds global surge of flood exposure is from population shifts far more than climate change (Sustain What)

Anonymous — Fri, 06 Aug 2021 06:00:00 +0000

Study finds global surge of flood exposure is from population shifts far more than climate change (Sustain What) Anonymous (not verified) Fri, 08/06/2021 - 00:00

Too often, rising climate risk is conflated with rising CO2. That takes the heat off national and local leaders who can cut drivers of risk on the ground now. Andy Revkin collects in-depth perspective from scientists and others on the global risk of flooding, the inequities and policies that are driving up that risk, and what we can do to manage it. Revkin cites work that involved Albert Kettner and Bob Brakenridge of the DFO Flood Observatory.

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New global map shows populations are growing faster in flood-prone areas (MIT Technology Review)

Anonymous — Thu, 05 Aug 2021 06:00:00 +0000

New global map shows populations are growing faster in flood-prone areas (MIT Technology Review) Anonymous (not verified) Thu, 08/05/2021 - 00:00

Satellite imagery reveals how floods are changing and who’s most at risk. A new global floods database involved Bob Brakenridge and Albert Kettner of the DFO Flood Observatory.

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