The configuration of piggyback pipeline and its local scour.

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Numerical investigation of the influence of the small pipeline on local scour morphology around the piggyback pipeline - ScienceDirect

Investigation on the Local Scour Beneath Piggyback Pipelines Under Clear-Water Conditions

Numerical Modeling of Local Scour below a Piggyback Pipeline in Currents, Journal of Hydraulic Engineering

Experimental Investigation of Scouring around Piggyback Pipelines in Different Arrangements

Full article: Study on dynamic slope angle of sandy seabed around the submarine piggyback pipeline in steady flow

Investigation on scour protection of submarine piggyback pipeline - ScienceDirect

Numerical Modeling of Local Scour below a Piggyback Pipeline in Currents, Journal of Hydraulic Engineering

Investigation on scour protection of submarine piggyback pipeline - ScienceDirect

Numerical Modeling of Local Scour below a Piggyback Pipeline in Currents, Journal of Hydraulic Engineering

Numerical investigation of the influence of the small pipeline on local scour morphology around the piggyback pipeline - ScienceDirect

Investigation on scour scale of piggyback pipeline under wave conditions - ScienceDirect