一是山溪性河流因其流域面积和河网的调蓄能力都比较小,坡降较大,洪水暴涨暴落,一次洪水过程短则几十分钟,长也不过几小时到十几个小时,因此溪河洪水来得快,去得也快,持续时间短,但涨幅大,洪峰高,洪水过程线呈多峰尖瘦峰型;平原河流由于流域面积较大且河流坡降比较平缓,不同场次的暴雨在不同支流所形成的多次洪峰先后汇集到大河时,各支 First, because of its stream basin area and river network regulation of storage capacity is relatively small, large slope drop, floods skyrocketing, a flood of short duration of dozens of minutes, but also a few hours long to a dozen hours, As a result, floods in the river reach faster, go faster, have shorter durations, but have a large increase in flood peak, and the course of the flood course shows a multi-peak spikelet type. Due to the large area of ​​the river basin and the relatively gentle slope fall of the river, The heavy rains in different tributaries formed by the many flood peak has brought together the river, each branch