海漫柔性加糙对近底流速影响的研究

Study on Different Relative Rughness Effect to the Velocity of Water Bottom

文恒教授等多年研究发现,用废旧轮胎对海漫进行柔性加糙,可充分调整海漫下游流速分布,降低近底流速,对于解决闸下冲刷破坏,效果非常显著。在延续海漫加糙试验研究的基础上,采用弹性较好的环状橡胶圈模拟废旧轮胎,在实验室人工水槽中做进一步海漫柔性加糙试验研究。通过对21种加糙形式进行试验,发现均在不同程度上使得海漫下游的近底流速明显减小,非常利于防冲。相对粗糙度在0.394～0.581范围内,糙体梅花状等间距均匀布满,并非糙体数目越多越好,而是糙体数目在8排左右对降低下游近底流速效果显著且趋于稳定。试验中还发现糙体间距在7～10.5cm时,从实际设计应用对近底流速和糙率、水深影响等方面考虑都非常有利。

The professor Wen Heng and his students found that velocity of bottom of water is too much, and they found that roughened apron by waste tires can adjust velocity and lower velocity of bottom of water. This method can cope with the problem and the effect is significant. When the relative roughness were between the arrange of 0.394～0.581 the arrangement of artificial roughness quincureioul form which with constant interval was not well as the artificial roughness were increased, but was about 8 lines which could significantly decreasing velocity of the bottom of and tending stability. We also found that when the interval of artificial roughness turns were 7～10.5cm, it was advantage to roughness, water depth and the effect of velocity of the bottom of water considered from practical application.