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THE MECHANICS OF SCOUR IN THE MARINE ENVIRONMENT
by B Mutlu Sumer (Technical University of Denmark) & Jørgen Fredsøe (Technical University of Denmark)
B Mutlu Sumer graduated with a MSc and PhD from the Istanbul Technical University (ITU), Faculty of Civil Engineering. He was a post-doctoral research fellow at the University of Cambridge. He was Professor of Hydraulics at ITU before he moved to Denmark in 1984. He has been with the Technical University of Denmark since then. His main fields of research are flow around marine structures (scour, forces, hydroelastic vibrations), and sediment transport. He has coordinated SCARCOST (Scour Around Coastal Structures) and has been coordinating LIMAS (Liquefaction Around Marine Structures), two European research programmes financed by the European Community under MAST III and FP5 programmes, respectively. He has done consultancy work for Danish companies on scour and scour protection in connection with wind mills, subsea structures and pipelines.
Jørgen Fredsøe is Professor at the Technical University of Denmark since 1986. He is PhD in sediment transport in 1974, and has had a close connection to the Danish Hydraulic Institute (now: DHI Water and Environment) since 1974 until now. Also he has acted as a consultant for many other Consulting Companies in Denmark and abroad, and for the World Bank. His main scientific interest lies in River and Coastal Sediment transport, and flow around offshore structures.
This book treats the subject of local scour around different kinds of marine structures, exposed to waves and/or currents. The first, major part of the book is devoted to marine pipelines, describing in detail all kinds of scour scenarios, and also making recommendations for scour protection. Other kinds of structures considered are single piles (slender or large), groups of piles, complex subsea structures, breakwaters, and seawalls. The scour due to ship propellers is also described. The book deals mainly with the scour in noncohesive sediment but, whenever possible, available literature on the scour in finer sediment has been incorporated. In addition, a chapter on the impact of wave-induced liquefaction is included.
The authors' aim is to describe in detail the hydrodynamic processes causing the erosion. With a hydrodynamic understanding, it is easier for the consulting engineer to predict scour in those many cases where physical model tests are not available.
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