Research On The Natural Buried Depth Of Submarine Pipeline Under The Interaction Of Wave And Current

As the main artery of offshore oil and gas transportation, pipelines perform an increasingly significant role. Thus, the development of marine and pipeline technology is the primary task of the current work. The research of buried depth of submarine pipelines can be served as a guide in the process of pipeline construction and laying. Furthermore, it can also provide important technical support for the operation of submarine.Based on the previous similar work, this paper briefly reviews the basic concepts and theoretical background of wave and sediment, and analyzes the scour and deposit under the interaction of the wave, current and sediment. According to the practical situation of the project, sediment of silt-sandy beaches has been picked as the prototype sand in the experiment. In the slope changeable wave-flow flume in Tianjin University, the incipient velocity of sediment has been measured. Then a series of physical model has been designed to research the mechanism of the natural buried depth of the submarine pipeline under the different situations of wave, current, dig depth and slope. Through comparative analysis, we can find that in the process of burying the pipeline, current velocity is predominated factor, followed by wave. Dig depth and slope only affect the thickness of buried depth.In this paper, the Euler model and UDF program is used to numerically make and absorb wave, structured and unstructured quadrilateral mesh with local mesh density are adopted. Realizable k ? ? model and Phase Coupled SIMPLE method are employed to simulate the practical project. This paper has simulated the buried depth, time and deposit thickness of the submarine pipeline under the different sets of wave, current interaction. The conclusion shows that under certain situation the pipeline can be buried by the natural deposit. And the simulated results make good agreement with the experimental observation.