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暴雨洪水有明显的季节性.我国各地出现的时间基本上与雨带的南北推移相吻合.由于暴雨多集中在雨季,其发生的频率次数多,危害大;而这个时期,多是农村小春及大春收获季节,田坎、山坡上到处都是稻草、麦杆等草料堆垛.洪水散去后,草料堆垛内集存大量水份.由于堆垛大而密集,内部集存大量水分,蒸发不快,热量意积愈大,到了一定的时候温度超过70℃,就会发生自燃.
Due to the heavy rainfall concentrated in the rainy season, the frequency of occurrence of the rainstorms is more and more harmful than that of the rainstorm. In this period, most of the time is the appearance of the rural Xiaochun Spring harvest season, ridge, hillside everywhere is straw, straw and other forage stacks .After the flood, the forage stack within a large collection of water.Because the stack large and dense, the internal accumulation of large amounts of water, evaporation Unhappy, the larger the amount of calories, to a certain time when the temperature exceeds 70 ℃, spontaneous combustion occurs.