Influences of finite-size effects on the self-organized critical-ity of forest-fire model

查看全文 作　　者：Weiguo [1]Song;Weicheng [1]Fan;Binghong [1]Wang

机构地区：[1]Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Peoples R China

出　　处：《Chinese Science Bulletin》索引2002年第47卷第3期,共4页

基　　金：This work was supported by the National Basic Research '973' Project in China ; the National Natural Science Foundation in China (Grant Nos. 59876039, 59936140 and 39970621). 摘　　要：The influences of finite-size effects on the self-organized criticality (SOC) of the traditional forest-fire model are investigated by means of a new method. The forest size is originally set to a value much greater than the correla-tion length of the forest. Finite-size effects are then studied by equally dividing the forest into more and more separate subsystems on condition that the forest size, igniting prob-ability and planting probability are invariant. A new phe-nomenon, i.e. the finite-size effects with one-side frequency peak, is observed. The boundary between two neighboring subsystems can be regarded as a firebreak. The concept of ’separation ability’ is introduced to represent the probability for the firebreak to block off the fire successfully. Restrain-ing effects of separation ability on finite-size effects are ana-lyzed. Finite-size effects and separation ability, as well as their relations are found to have practical importance to the actual forest-fire protection. 关键词：forest-fire model SELF-ORGANIZED CRITICALITY cellular AUTOMATA FINITE-SIZE effects.

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Influences of finite-size effects on the self-organized critical-ity of forest-fire model

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