Scour Control under Submerged Pipelines with Different Gaps under Unidirectional Flow Using Submerged Plate

Scour under the pipelines laying on the sea and river beds occurs and as a result the scour hole develops. Occurrence of scour hole under the pipelines leads to instability, bending and even failure of the pipeline. This causes fluid inside the pipeline spread into the sea and river and in addition to water pollution endangers the human and marine life. In this paper, the results of laboratory research on the effects of placing submerged plate to reduce the maximum scour depth under submerged pipelines are presented. Experiments were conducted in two modes: 1) scour under pipelines without submerged plate, 2) scour under pipelines with submerged plate. The results showed that when a submerged plate was placed in the downstream of the pipeline, scour in the front of the pipelines was reduced about 70 percent. By using the submerged plate and creating gap between the pipeline and bed better results can be achieved to reduce scour under the pipeline.