桥测断面流速垂直分布规律分析--《吉林水利》2002年06期

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桥测断面流速垂直分布规律分析

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/l(f,n6Zy2W b9Kc0【摘要】:正天然河流的流速垂直分布,一般是水面流速大于河底,且呈一定的曲线形状。由于影响流速垂直分布因素很多,如河床糙率、冰冻、水草、水深、风力、河槽形式等,故曲线形状也各不相同。经许多学者实验研究,导出一些经验、半经验的分布曲线公式,如抛物线公式、椭圆公式、指数公式及对数公式等。其中对数曲线型公式比

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K-v,s\+T#?6zH0流速垂直分布 规律分析 断面流速 垂线流速分布 垂线平均流速 相对水深 水面流速 前垂线 桥测 抛物线公式

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JR L9X+tP"m%d0天然河流的流速垂直分布,一般是水面流速~2 %。墩前垂线的流速从水面至0.6H点缓慢大于河底,且呈一定的曲线形状。由于影响流速变小,0石H点的流速约为垂线平均流速的0.78垂直分布因素很多,如河床糙率、冰冻、水草、倍。而墩侧垂线的流速分布在0.SH点以上变化水深、风力、河水利论文,z$F7bfG*ZA

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