Firebrand Spotting Distance: A Phase-Space Map of Ember Dispersal

What the Phase-Space Map Is

A phase-space map is a graphical representation of the state of a system at any given time. In this context, it maps out how different parameters like wind speed and firebrand diameter influence spotting distance.

By visualizing these relationships in two dimensions—wind speed on one axis and ember diameter on the other—the map provides insights into the complex interplay between embers and environmental factors.

Why It Matters

Firebrand spotting is a critical factor in wildfire spread. Understanding how far and where embers can travel helps firefighters predict fire behavior, plan containment strategies, and protect communities.

The phase-space map simplifies this complex phenomenon by showing the terminal velocity of falling embers, wind advection effects, and burn-out rates, making it easier to grasp these dynamics.

How It Works

In a firebrand spotting scenario, embers are ejected from the main fire plume. Their distance traveled is influenced by their size (diameter) and the wind conditions. The phase-space map plots these variables to show how they affect spotting distances.

By adjusting parameters such as wind speed and ember diameter, users can see how changes in these factors alter the embers' trajectory and landing points.

Real-World Examples

During large wildfires, embers can travel hundreds of meters from the fire front. This phenomenon is responsible for many spot fires that occur far away from the main blaze.

Understanding these dynamics helps in developing more effective firefighting strategies and evacuation plans.

Frequently asked questions

Try it live

Everything above runs in your browser — open Firebrand Spotting Distance — Phase-Space Map and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.