Scour Prediction in Cohesive Marine Soils: A Hybrid Approach

John M. Harris, Nikolas S. Tavouktsoglou, Amelia Couldrey, Richard J.S. Whitehouse, Jamie Klapper

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Regardless of the advancement in scour research in the last three decades, scour prediction at offshore foundations in cohesive and non-uniform soils still involves great uncertainty and remains a challenge for designing structurally efficient and effective foundations offshore. One approach to scour prediction in these marine soils is the application of the Erodibility Index method, allowing for the physical properties of the soil to be considered. The method does not directly take into account the chemical properties of the material, although the mass strength number, MS, represents the relative influence of chemical bonding properties of the soil through the unconfined compressive strength. This paper presents a case study for a planned offshore wind farm located in the Baltic Sea. The soils in the upper seabed have extremely low to low undrained shear strengths (0 - 15 kPa). The study combines the Erodibility Index method with site-specific geotechnical information and targeted soil sample erosion testing to provide a means of calibrating the method for site-wide use, utilizing the cone penetrometer test data undertaken at every proposed monopile location to enable the Erodibility Index method to be calibrated at each foundation.  


Scour, Cohesive, Baltic, Monopile, Erodibility, Probabilistic


Harris, J. M., Tavouktsoglou, N. S., Couldrey, A., Whitehouse, R. J., Klapper, J. (2022). Scour Prediction in Cohesive Marine Soils: A Hybrid Approach, Vol. 7, Issue 4, p.59-75. doi: 10.4417/IJGCH-07-04-06


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