Illustration of power lines fire research

Illustration: Bratislav Milenkovic

Schematic: Predicting Wildfires

Research by Professor Paolo Bocchini and doctoral student Xinyue Wang provides the methodology for predicting when powerline ignition is likely in high winds.

Electric power systems ignited at least five of the top 20 most destructive California wildfires between 2016 and 2020, according to data from the California Department of Forestry and Fire Protection. As prevention, California electric utilities are authorized to conduct Public Safety Power Shutoffs—causing blackouts that affect millions of people and that impact medical devices, traffic lights and the like. When is a shutoff necessary? Can wildfires sparked by power systems be prevented?

Research by Paolo Bocchini, professor of civil and environmental engineering and founder of Lehigh’s Catastrophe Modeling Center, and doctoral student
Xinyue Wang provides the methodology for predicting when powerline ignition is likely in high winds. The study is published in Scientific Reports-Nature.

The first-of-its-kind research can help decision-makers determine when a shutoff is warranted, as well as help vegetation managers in allocating resources to minimize risk, Bocchini says.

Spanning long distances, electric power systems carry high-voltage electricity across variable terrains and can spark catastrophic wildfires in the event of high winds and dry weather conditions.

High winds can cause conductor cables to oscillate in such a way that they become close to surrounding dry vegetation. Additionally, the high winds could
cause broken trees and limbs to fall into the conductors, as well as hinder firefighting efforts.

The dry vegetation acts like fuel. To reduce risk, regulations call for a minimum distance between conductors and vegetation. Typically, only low-growing vegetation is allowed in a “wire zone.” Taller shrubs and small trees may be permitted in border zones.

Transmission conductors sag and sway in the wind. Thus, rights-of-way are usually much wider than what is needed for the structures. Wind intensity
and vegetation clearance policies are major factors affecting the probability of encroachment.

Related Stories

flags behind a fence

Study: Threat of Deportation Leads to Psychological Distress Among Both Latino Citizens and Noncitizens

Amy Johnson and research collaborators find it’s not just undocumented immigrants who feel at risk.

Nicole Johnson research

New Research Highlights Link Between School Shootings and Violence Against Women

Research led by Nicole Johnson, associate professor of counseling psychology, finds that 70% of school shooters have perpetrated violence against women and can influence prevention strategies.

Santiago Herrera and a student at the symposium

Lehigh Oceans Research Center Holds Inaugural Symposium

The College of Arts and Sciences launches a new research center that focuses on the field of ocean science.