بررسي آزمايشگاهي تاثير آستانه بر كنترل رسوب بار بستر در آبگيرهاي جانبي

Experimental investigation on sediment control in lateral intakes using sill

Using floodwater in arid and semi arid areas of Iran is important especially in the recent years. Lateral intake is a method of floodwater diverting- In arid and semi-arid areas, floodwater has large amount of sediment that will be carried into the intakes and decreases the channel conveyance. There are several methods of sediment control in lateral intakes. Most of these methods are used in permanent river and irrigation canals. Also the amount of sediment inclusion into the intake and pattern of sedimentation has been analyzed. Experiments have been done for a 60-degree intake channel. Slope and width of main channel, width of lateral channel and bed material of main channel are constant in all experiments. For the selected bed material, there is only bed load sediment transport. Experiments have been done for three discharges and three depths for each dischagre. The volume of sediment entered into the lateral channel and the volume of sediment transported in main channel have been measured. The pattern of sedimentation has been determined using topography information of entrance of lateral channel. The results showed that the volume of sediment transported into the lateral channel and the width of sedimentation area decrease with using sill.