溪河洪水也叫山溪性洪水,是一种最为常见的山洪。溪河洪水是山区溪河由暴雨引起的突发性暴涨暴落洪水。当流域普降暴雨时,流域各处所形成的地面径流,依其远近先后汇集于河道,就某一断面而言,当近处的地面径流到达该断面时,河水流量开始增加,水位相应上涨,这就是洪水起涨之时。随着远处的地表径流陆续流到,河水流量和水位继续上涨, River flood, also known as mountain torrent, is one of the most common flash floods. River flood is a sudden rise and fall floods caused by heavy rains in the mountain river. When the heavy rainfall in the basin, the surface runoff formed in various parts of the basin converges to the river course according to its distance. In terms of a section, when the near surface runoff reaches the section, the flow of water starts to increase and the water level rises correspondingly. This is when the flood rises. As the surface runoff in the distance one after another flows to the river flow and water level continues to rise,