Experimental Investigation on the Effect of Sluice Gate Distance on the Flow Structure and Amount of Sediment Entry to the Lateral Intake in Diversion Dam

摘要

A set of laboratory experiments has been carried out involving a layout that is common in irrigation diversion works. The layout involves a lateral intake channel with diversion angle 110° and diversion dam which are positioned to allow the flow to be controlled and managed. Based on experimental measurements and observations the effect of sluice gate distance from downstream corner of the intake entrance on the hydrodynamic behavior of diverging flow and a-mount of sediment entering the intake was investigated. The velocity profiles, both upstream of the intake in the main channel, in front of the intake in the sluiceway and a cross the intake entrance and amount of sediment entering into the intake were measured under various discharge combinations of the intake and sluice gate. Experimental observation and analysis of the velocity profile along the intake entrance showed that the structure of the diverging flow into the intake was a function of the sluice gate discharge. Comparison of the result showed that as the sluice gate distance from upstream corner of the intake increased, maximum return velocity increased. Analysis of the sedimentary measurements data showed the amount of sediment entering the intake increased with increasing intake discharge. Comparison of the results showed that with increase relative intake discharge (Dr) from 0. 3 to 0. 6, amount of sediment entry into the intake increase 3 timed approximately. In addition, an increase in the sluice gate discharge caused an increase of sediment entry to the intake under the same intake discharge Comparison of the sedimentary measurements data under different sluice gate discharges showed that an increase the sluice gate discharge from closed gate condition to relative sluice gate discharge (Sr) 0. 18, amount of sediment entry into the intake increase 59. 81 percent approximately. Comparison of sedimentary result showed that amount of sediment entering into the intake increase 13. 8 percent with increase of the sluice gate distance from the intake entrance.