影响黄河下游洪峰传播时间因素的分析

The affecting factor analysis of propagation time of peak flood in downstream of the Yellow River

洪峰传播时间是水文预报中的一个重要因素,为了较好地做好黄河下游洪峰传播时间的预报工作,依据洪水波运动的基本规律,结合黄河下游特有的断面形态和河槽的变化规律,分析研究了黄河下游的水面比降、水流阻力与洪峰传播时间的变化关系,进一步探讨洪峰传播时间与河床糙率关系建立的方法。

Propagation time of peak flood is one of the most important factors in hydrologic forecast.To better forecast the propagation time of peak flood in downstream of Yellow River,the relationship of the specific drop of water level,friction of streams and propagation time of peak flood has been studied according to the fundamental regular pattern of flood wave combined with the characteristic section form and alternation pattern of riverbed.Relationship between propagation time and roughness of riverbed is further studied.