Chiew Yee Meng is currently a Professor in the School of CEE at the Nanyang Technological University, has more than 35 years of research experience in sediment transport, turbulence, hydraulics and coastal/offshore engineering. He particularly is interested in scour at hydraulic structures such as bridge piers, submarine pipelines, monopiles, ship propellers, jets, etc. and how such erosion affects the integrity of the surrounding structures and sediment bed. His research interests also include turbulence effects in fluvial and coastal hydraulics and the influence of seepage on the turbulence characteristics. He has more than 160 archival publications and serves as

an Associate Editor for Journal of Hydraulic Engineering, ASCE and International Journal for Sediment Research. Throughout his career, he has acted as a Specialist Consultant to numerous international and local companies and governmental organizations, offering his expert advice to solve challenging engineering projects.

Submarine pipelines are indispensable features in the offshore and marine industry for conveying hydrocarbons from one location to another. A scour hole may form on an erodible seabed around underwater pipelines due to the action of waves and currents. The development of scour holes can compromise the  integrity of pipelines and it often is the main cause of pipeline  Consequently, the prediction of pipeline scour is an important design consideration and this subject has been studied extensively for several decades. During the early stages of pipeline research, were devoted to the development of empirical equations for the prediction of 2-dimensional scour depth. In more recent years, research works has progressed investigating the development of 3-dimensional scour hole because the span that forms beneath the pipeline was recognized to be a more important variable in affecting pipeline failure. Notwithstanding the progress, those researches still were confined to a static pipeline. In the past 5 years, the effect of vibration on scour hole development has attracted more attention because the touchdown point of a vibrating steel catenary, for example, likely will have a profound effect on scour hole development. Recent laboratory research findings using a truncated riser subjected to a vertical sinusoidal motion of varying amplitude  frequency have shown important variations between static and vibrating pipelines, resulting in the formation of fundamentally different scour profiles. Using both Acoustic Doppler Velocimetry (ADV) Profilers and Particle Image Velocimetry (PIV) techniques to measure the flow, the surrounding flow field is shown to be markedly modified by pipeline and riser vibrations. The augmented fluctuating velocity considerably increases local turbulence, thereby promoting scour. The maximum scour depth increases significantly with both vibration amplitude and frequency, with frequency exerting a more profound influence. This talk presents the state-of-the-art findings on vibration effects on pipeline scour.