Study On The Mechanism Of Water Of Flow By Adding The Flexible Roughness In The Sea Bottom

Under the plain irrigation area dam floodgate washes out the destruction to be serious also the universal existence. Washing out destroys the position overwhelming majority to occur in the toe basin downriver sea inundates and guards against flushes the trough place. The reasons of washing out the destruction are very many, when the toe basin design is reasonable, under the floodgate the class disappears can in the full situation, the sea inundated the terminal still to be able to produce flushes the pit, it produced the reason besides also had the kinetic energy which surplus should disappear, mainly was because the cross section speed of flow has not restored the habit, the near bottom speed of flow was the result of greatly.This article in inundates to the sea adds roughness had the research in the foundation, and had a detailed test on the distribution of speed of flow of section behind each different tyre roughness which is combined, plus the original in the behind of the roughness of the nearly 20cm next to the end of it, is measured only one point. Now increasing by 35 points, and selecting 20cm, 25cm, 30cm and 35cm, which is four kinds of water lever working conditions. The roughness is set up from one till seven rows respectively, measuring the speed of flow the observation point in the direction of water flow, behind the roughness and vertical cross section, and carrying out the analysis adding roughness mechanism. With the water lever and rows of roughness increasing, now the speed of flow at the bottom part of the channel under 7.5cm is smaller relatively, but at the bottom of type above 7.5cm, formulated a relatively large flow banding. The tyre is the central of the hole measuring point C4, which is bigger than upper that of B4, when the number of row of roughness reaches 7 rows, the line of the speed of flow is changed from a broken line into a relatively smooth curve one, under the influence of the water level, the rows of roughness of the location of section, and the speed of flow near the bottom are being simulated, and reaches the simulated formula finally.Analysis the changes in the speed of flow of the respective point above the section under the different water level, and different roughness body of arrangement form , and analysis the changes of the same one point of the rows of the same roughness body under the different water level. Because the condition of test and time are limited, the gained conclusion needs rectifying under the actual project further.