Abstract
Numerical simulation results of coniferous tree heating by cloud-to-ground lightning discharge are presented. Pine tree is under consideration. The problem is solved in one-dimensional statement in cylindrical system of coordinates. Parametric investigation of volt-ampere characteristics influence on stem heating process was lead for negative and positive ground lightning discharges. Conditions of coniferous tree ignition in a typical range of influence parameters change are established.
Highlights
Occurrence of forest fires is caused mainly by the anthropogenous reasons [1]
Existing criteria do not consider the physical mechanism of tree ignition as a result of cloud-to-ground lightning discharge action
Analyzed results allow to drawn conclusion, that tree trunk ignites and, at least, chars. At such temperatures occurs ablation of wood material to formation of furrows on trunk outer side. This conclusion corresponds to data of observations of thunder-storms [13] where it is specified, that tree charred as a result of cloud-to-ground lightning discharge action
Summary
Occurrence of forest fires is caused mainly by the anthropogenous reasons [1]. But in taiga [2] and high-mountainous [3] regions the great value has occurrence of fires in large forests at passage of a thunder-storm as a result of cloud-to-ground lightning discharge action [4]. Creation of the forest fire ignitions forecast technique on the basis of mathematical statement of a problem about tree ignition by cloud-to-ground lightning discharge is expedient. Mathematical simulation of such difficult process presumes to avoid unprofitable experimental researches. Research objective of paper is mathematical simulation of coniferous tree ignition process by cloudto-ground lightning discharge.
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