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本文分析了影响河流或渠道断面流速分布的因素，建立了反映水流特点和河渠断面形状的指数型流速经验分布函数，并提出了相应的参数率定方法、导出了流速预报公式．实例应用表明，本文建立的河道断面流速分布函数模拟和预报精度较高，其成果为三峡工程大江截流期龙口和导流明渠的流速预报发挥了重要作用．
In this paper, the factors that affect the flow velocity distribution in the river or channel section are analyzed. An empirical distribution function of the exponential velocity that reflects the characteristics of the water flow and the shape of the river channel is established. The corresponding parameter calibration method is proposed and the flow rate prediction formula is derived. The example application shows that the simulation and prediction accuracy of the flow velocity distribution function of the river section established in this paper is high, and the results have played an important role in the prediction of the velocity of the Longkou and the diversion channel of the Three Gorges Project.