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应用本文所提供的图解法,可十分简捷地算得不同明渠断面的均匀流水深。一、阻力公式通常最常应用的阻力公式是满宁公式:V=(1/n)R_r~(2/3)·S~(1/2) (1)式中符号:V,流速(米/秒);R_r,水力半径(米);S,坡降;n,满宁糙率系数。满宁公式虽被普遍采用,但尚有缺陷,一是两边量纲不一致;再是阻力系数 n 是经验数值。如以满宁公式与对数阻力定律对比,可知 n 值主要与粗糙表面凸起体高度有关,而与相
Using the graphic method provided in this paper, it is very simple and easy to calculate the average flow depth of different open channel sections. First, the resistance formula The most commonly used resistance formula is Mannin formula: V = (1 / n) R_r ~ (2/3) · S ~ (1/2) where symbol: V, the flow rate / S); R_r, hydraulic radius (m); S, slope; n, Manning roughness coefficient. Although the Manning formula is widely used, but there are still flaws, one is inconsistent dimension on both sides; then the resistance coefficient n is an empirical value. As with Manning formula and logarithmic resistance law comparison, we can see that the value of n is mainly related to the height of rough surface convex body, and phase