Model could help communities set effective subsidies for wildfire mitigation

A novel model devised by Washington State University researchers could assist communities in devising the most effective subsidies to motivate residents to fortify their properties against wildfires. These formulas can be harnessed by fire-prone neighborhoods to discover the ideal incentives to spur individuals into protective actions, such as eliminating flammable vegetation or upgrading roofing materials. The study was published in the journal Expert Systems with Applications.

In recent years, the frequency and severity of wildfires in the United States have surged, alongside a growing populace inhabiting close proximity to fire-prone zones. Consequently, homeowners must become proactive in safeguarding their homes, as their actions are pivotal in diminishing wildfire risks, especially in areas bordering forests.

Certain states, like California and Oregon, have instituted subsidy schemes in recent years to motivate residents to fortify their properties or manage vegetation for fire safety. However, the effectiveness of these programs has been inconsistent.

Individuals frequently procrastinate on property preparation for wildfire season due to the associated expenses, or they rely on neighbors to take action, which safeguards their homes without exerting any effort or spending money themselves. This behavior, known as "free riding" in social sciences, diminishes overall community preparedness.

The high cost often emerges as the most significant hurdle when contemplating wildfire mitigation, according to Zhu-Jun Wang, a postdoctoral researcher in the Department of Civil and Environmental Engineering and the paper's lead author.

The multidisciplinary research team employed game theory, which involves mathematical models to examine the strategies of players, to explore how government agencies and homeowners might collaborate to achieve optimal results and enhance preparedness. Their theoretical analysis revealed that once a subsidy surpasses a certain threshold, people are inclined to act.

Once subsidies are sufficient to encourage widespread participation, additional increases in government subsidies may yield diminishing returns relative to the extra public expenditure required.

Wang elucidated, "When the government's subsidy is sufficient and exceeds a specific threshold, homeowners will alter their decisions." Moreover, the researchers discovered that garnering early and collective participation in subsidies is instrumental in ensuring overall engagement. The number of homeowners taking action from the outset can significantly influence subsequent trends.

If only a few households participate, wildfire prevention endeavors may gradually dissipate—other residents may perceive little motivation to act, leaving the community unprepared. Conversely, if a significant number of households engage early on, others may follow suit, rendering wildfire protection more widespread across the community.

The researchers had to transcend conventional engineering methodologies, delving into subjects like human behavior, game theory, and government policy. Ji Yun Lee, an associate professor in the Department of Civil and Environmental Engineering who spearheaded the project, emphasized the necessity of adopting a multidisciplinary approach to tackle wildfire resilience issues.

She stated, "We must view this wildfire risk and resilience challenge as a multidisciplinary problem. Relying solely on engineering solutions may not suffice to address this issue. Only by integrating diverse perspectives can we devise a truly effective solution for wildfire resilience."

The research team intends to integrate the game-theoretic models and other data acquired from homeowner surveys and interviews with local government officials to construct a simulation of individual homeowners' decision-making processes and their interactions with neighbors. They aspire to create an agent-based simulation platform, enabling local community leaders to evaluate their policies and mitigation programs, ultimately devising solutions for wildfire resilience.