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EESA Geophysicists Explore Landslide Hazard Using Novel Remote-Sensing Approach3 min read

by Christina Procopiou on October 17, 2022

Energy Geosciences Division

Above: EESA geophysicists are using sensors capable of remotely monitoring land deformation and soil characteristics like cohesion and thickness that are indicative of the potential for landslide hazard. When paired with machine learning, the data could help scientists predict the probability of a shallow landslide–usually less than 3 meters–at different points across a landscape at different times. Photo by Sebastian Uhlemann

Torrential rains in Venezuela early last week provoked a devastating landslide, adding to the deluge of stunning climatic events of the past month. With locations around the globe receiving larger amounts of intense rainfall over shorter periods of time under climate change, bigger, costlier landslides that directly impact infrastructure have become more frequent–and urbanization exacerbates their risk.

Landslides are the downslope movements of soil or rock, and shallow slides which are typically less than 3m deep affecting just the soil can be plenty disruptive. EESA geophysicists are testing out using low-cost, low-profile sensors to monitor shallow landslide processes and learn which characteristics increase landslide hazard. What they find could equip land managers with the tools needed to map landslide hazards across space and time or ultimately to develop landslide early-warning methods. 

EESA Scientists Sebastian Uhlemann, Stijn Wielandt, and Baptiste Dafflon and Postdoc Fellow Sylvain Fiolleau are using novel geophysical and remote-sensing techniques to estimate soil conditions such as soil cohesion and thickness, which dictate how much material can move downslope, as well as signs of ambient seismic noise, which are known to change their characteristics hours before a landslide occurs.

“The traditional approach to mapping landslide hazards is building ground models to depict Earth’s subsurface. These take considerable effort involving drilling, which can be complicated due to steep slopes and limited access, and analyzing soil samples, which is costly and slow,” said Uhlemann. “We have shown that we are able to characterize the subsurface with considerably less effort using geophysical and remote-sensing data to estimate critical parameters, such as soil cohesion, in different locations across our study site. To monitor the soil parameters that are important for landslide processes, we developed low-profile sensors that are easy to install and inexpensive.”

This work is similar to other efforts underway by EESA scientists who are using novel sensing tools and computer modeling to assess, for example, how climate change is impacting a vast Colorado River watershed or to speed up the time it takes to evaluate whether critical buildings are safe to occupy shortly after a major earthquake. In the case of the work led by Uhlemann, it’s possible to take the data obtained by the sensors and establish a landslide probability map estimating the degree of landslide hazard at different locations across a site, or to focus more narrowly on particular areas of concern. The team is also experimenting with using machine learning to predict future changes in soil properties that could potentially alter the degree of landslide hazard and allow them to assess risk hours to days ahead of time. This will then enable early warning of potentially hazardous conditions. 

Between 2004 and 2016, 4,862 nonseismic fatal landslide events were recorded in the Global Fatal Landslide Database–12% of these events directly impacted infrastructure. Research into improving efforts to quantify landslide hazard and risk are needed as the number and intensity of these events continue to rise. This work is supported by Berkeley Lab’s Laboratory Directed Research and Development Program.

A recent paper, “Low-Power, Flexible Sensor Arrays with Solderless Board-to-Board Connectors for Monitoring Soil Deformation and Temperature,” was published this spring in the journal Sensors and describes the team’s work. 

 

News & Events

Study Sheds Light on Microbial Communities in Earth’s Subsurface2 min read

August 16, 2023

  From the tops of tree canopies to the bottom of groundwater reservoirs, a vast amount of living organisms interact with nonliving components such as rock, water, and soil to shape this area of Earth known as the “critical zone.” Over half of Earth’s microbes are located in the subsurface critical zone, which ranges from…

Carl Steefel Honored in Goldschmidt Session on Reactive Transport2 min read

August 2, 2023

The contributions of Carl Steefel to the reactive transport modeling scientific community were recognized in a session held in his honor at the recent Goldschmidt 2023 conference (Lyon, France). Goldschmidt is the foremost annual, international conference on geochemistry and related subjects, organized by the European Association of Geochemistry and the Geochemical Society. The session was…

DOE Funds Projects to Advance Forest Carbon Dioxide Removal Efforts and Agricultural Soil Carbon Conservation4 min read

August 1, 2023

The DOE Office of Fossil Energy and Carbon Management (FECM) and Office of Technology Transitions (OTT) recently announced $5 million in funding for four projects–two from Berkeley Lab with EESA leadership. The projects selected offer “promising solutions” to the nation’s climate change challenges by helping to reduce greenhouse gas emissions and will “accelerate their deployment…

Quantifying the strength of the land carbon sink3 min read

July 26, 2023

This article first appeared at nature.berkeley.edu/news. The world’s forests, grasslands, and other terrestrial ecosystems have played a substantial role in offsetting human carbon emissions—a capability that UC Berkeley researchers say would be threatened by continued global change. The assessment, published today as a new review paper in Nature Reviews Earth & Environment, presents a comprehensive analysis of…

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