Mathematical simulation of the forest fire thermal effect on root system fragments of coniferous tree

Nikolay Baranovskiy,Dmitry Zakovryashin,G.V Kuznetsov,A.O Zhdanova

doi:10.1051/matecconf/201711001010

Nikolay Baranovskiy, Dmitry Zakovryashin + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201711001010

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Abstract

We present the numerical simulation results of heat transfer in a layered structure of the root branch when exposed to a high temperature from a forest fire in this paper. The problem is solved by the method of finite differences in a cylindrical coordinate system using a one-dimensional formulation. Typical exposure times and temperatures in the forest fire front are considered. The temperature distributions are presented for the system “root fragment-soil-forest fuel-air”. We revealed the character of the temperature distribution and the depth of the soil layer heating to the values which are dangerous for the coniferous tree root system.

Highlights

Analyzing the events of recent decades, we can say that forest fires have turned from a natural regulatory factor into catastrophic phenomena leading to environmental, economic and social damage [1, 2]
Forest fires divided into several types, each of them characterized by a certain temperature in the area of the combustion
A high temperature in the forest fuel layer equal to 1073 K assigned to simulate the process of heating from the focus of forest fire, which according to the classification of forest fires corresponds to the temperature of the surface forest fire

Summary

Introduction

Analyzing the events of recent decades, we can say that forest fires have turned from a natural regulatory factor into catastrophic phenomena leading to environmental, economic and social damage [1, 2]. High temperatures of forest fires have a negative impact on forest stands, leading to their damage and even death [3, 4]. There are a number of articles devoted to the mathematical modeling of heat transfer in soil [7] during a forest fire, only the depth of warming up the soil layer to temperatures lethal for microorganisms living in the soil considered in this work. Many articles have been published to date, describing the results of full-scale studies of the effect of forest fires on the soil, which make it possible to estimate the temperature of warming up the soil layer to the marks dangerous for the roots of trees [8, 9]. Creation of computer systems for geoecological monitoring of forest areas exposed to forest fires, based on physically meaningful mathematical models of heat transfer, the should become the main direction of development

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