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动床阻力随床面形态的变化而变化,而床面形态又是水流强度的函数,Simons将两者关系分为三个流区,即低水流区、过渡区和高水流区。不同流区阻力特性和规律是不相同的,正确和合理地判别流区是正确确定阻力关系的先决条件。此文在Browline研究的基础上,进一步分析了影响床面形态的基本要素,提出了在第一时间判别流区的方法,建立了各区阻力关系式,并利用长江和黄河实测资料和水槽试验资料进行了预报计算,其精度优于其它同类公式。
The resistance of the moving bed varies with the shape of the bed, and the shape of the bed is a function of the intensity of the water flow. Simons divides the relationship into three flow zones, ie, low water flow zone, transition zone and high water flow zone. The characteristics and rules of resistance in different flow areas are not the same. Accurate and reasonable discrimination of flow areas is a prerequisite for correctly determining the relationship of resistance. Based on the Browline study, this paper further analyzes the basic elements that affect the shape of the bed, puts forward the method of discriminating the flow area at the first time and establishes the relation of resistance in each area. Based on the measured data of the Yangtze River and the Yellow River and the experimental data of the sink Carried out the forecast calculation, the accuracy is better than other similar formula.