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    It is a Dry Heat: Econometric Model of Historic Fires

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    Author
    Dew, Taylor J.
    Issue Date
    2021
    Advisor
    Frisvold, George
    
    Metadata
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Several studies have applied regression analysis to measure factors contributing to larger wildfire suppression costs. They often include acres burned, variables that are functions of acres burned, or both. This can create problems of simultaneity bias. While it is common for studies to use instrumental variable methods to address simultaneity, they in general do not evaluate the strength or weakness of their instruments. Another drawback of using acres burned as an explanatory variable is that regression models have limited value in forecasting suppression costs ahead of time, because suppression and burning occur at the same time. This study takes a different approach, relying on variables that can be used as soon as fire starts. It attempts to answer the question, given that a fire has started, what accounts for it having higher suppression costs and more burned acres? Data from the Burned Area Emergency Response (BAER) reports are combined with other geo-coded variables to examine wildfires in Arizona’s national forests from 2002-2019. Regressions were run for three different variables: (a) natural log of suppression costs, (b) natural log of acres burned, and (c) a binary variable that equaled one if the fire was greater than 30,000 acres and zero otherwise. The regression results suggest that Arizona wildfires that start in May and June are positively associated with higher suppression costs and more acres burned. This suggests benefits of increased vigilance of fire managers during these months. This variable was less able to predict the occurrence of the very largest fires, however. The amount of land in the Wildland Urban Interface (WUI) was negatively associated with fire suppression costs and not a significant predictor of fire size. Past empirical results regarding the WUI have been mixed. Average relative humidity was a significant (negative) predictor of both suppression costs and of very large fires. This variable has not been much used in previous studies and may become important if aridity in Arizona increases with climate change.
    Type
    text
    Electronic Thesis
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Agricultural & Resource Economics
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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