عنوان مقاله [English]
In present study the effects of transverse waves modes 1, 2, 3 and 4 in a staggered obstacles arrangement on suspendedsediment load transport in a rectangular flume was investigated. The results show that in no transverse wave condition, the concentration of suspended sediment at downstream obstacles zone is more than the part of no obstacles zone but it was reduced in the case of existing transverse wave. In the same condition of discharge, diameter and perpendicular and transversal distances of obstacles, increasing of transverse wave mode caused to decrease of this difference. Also, the percentage of decreased suspended sediment concentration in obstacles zone rather than no transverse wave condition was decreased. In fact the concentration of the transported suspended sediment in obstacles zone for wave modes 1, 2, 3 and 4 rather than no transverse wave condition was decreased about 6.2%, 3.9%, 3.6% and 3.1%, respectively and in this condition, suspended sediment was deposited at upstream of the obstacles zone for transverse wave modes 3 and 4. However, 1% and 3% of this sediment was transported to no obstacles zone for wave mode 1 and 2. Also, according to findings, the ability of wave for decreasing of suspended sediment concentration at downstream obstacles zone rather than part of no obstacles zone is increased by increasing of the wave amplitude.