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1.山洪灾害的概念(1)山洪山洪是指山区荒溪、干沟和溪河中发生的暴涨暴落的洪水。山洪所流经的沟道坡度陡峻,地质条件复杂,具有历时短、流速快、冲刷力强、挟带泥石多、破坏力大等特点。我国山区面积占国土面积的2/3,半数以上的县都有山区,山洪现象极为普遍。一山洪灾害防御基本思路
1. The concept of flash flood disaster (1) Mountain torrent Mountain flood refers to the wild river, dry ditch and the river in the ups and downs of the flood. Due to the steep slope of the channel through which mountain torrent flows, the geological conditions are complex, with the features of short duration, fast flow rate, strong scouring force, large amount of debris and destructive power. China’s mountainous area accounts for 2/3 of the total land area. Over half of the counties have mountainous areas, and flash floods are extremely common. A mountain flood disaster prevention basic ideas