Study On Defining Relative Roughness Of Roughened Flexible Rubbers Of Apron And The Effect Of Velocity Of Water Bottom After The Rubbers

Destruction of erosion exists widespread and serious in most sluice gate on plains, and most take place in erosion control measure pitching and apron extension. In some serious the plunge pools be washed off, which nuisance the whole gate chamber. The reasons about washing off have many, cross section of the gate chamber contracting too much; the diffusion coefficient of wing abutment is unfit, condition of energy dissipation be unreasonable, and so on. You can change the condition of energy dissipation or sluice the gate in all kinds of methods, but the erosion phenomenon is still on and don't make out efficiently. 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.This study was conducted on the base of the experiment of apron roughness increasing before, and used rubber turn which with good spring to simulate waste tires to fouler study apron flexible roughness in laboratory artificial flume. We designed 21 kinds of roughness increasing and place condition of water on different cross section. The aim was to fully understand the artificial roughness rubbers number, size/dimensions and assign form in different roughness relative, and the effect of it on the apron roughness and velocity of the bottom of water, and then found the optimum scheme of artificial roughness rubber's form and dimensions, which could be used in practice.By the testing we found the flexible artificial roughness rubber turns which simulated the wasted tires were the main factor which affect the roughness of the bottom which directed to vertical flow. By increasing roughness, the velocity of bottom of water decreased significantly, and could protect erosion very well. After increasing roughness of apron, the water rover at the end of plunge pool was increase/enhanced, therefore it could decrease the water height of plunge pool in practical program. When the relative roughness were between the arrange of 0.394 to 0.584. the arrangement of artificial roughness quincureioul form which with constant inter was not became 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 7-10.5 cm, it was advantage to rase of roughness, water level and the effect of velocity of the bottom of water considered from practical application.