Understanding Geotechnical Offshore Wind Challenges and Practices

Presented by Mohamed Mekkawy, Ph.D.
Principal Engineer
Hana Engineers & Consultants

This is the second seminar in a series that is part of the Offshore Wind Hybrid Simulation Facility (OWHSF) at Lehigh University, which is sponsored by the U.S. Department of Energy.

March 5, 2021
2:00 pm EST
Zoom Link: https://lehigh.zoom.us/j/91563784823?pwd=byttTFVXYzlheTZLV0Flc1FzMU8wUT09

Abstract
Long term changes in the dynamic characteristics of Offshore WTGs are often used as indicators of performance and structural damage. Among several factors, soil deformation and long-term changes in soil properties can influence modal frequency and damping ratio, which are used to assess performance. To avoid strong resonance, these modal parameters need to be properly estimated by quantifying and incorporating changes in soil properties and site conditions in the design.  Therefore, a robust and comprehensive site investigation, geophysical survey and laboratory testing programs are critical to, not only successful foundation installation, but also estimation of long-term performance of the structure.  In this presentation, a brief overview of the offshore wind industry will be provided followed by a discussion on geotechnical and geophysical offshore wind practices, and how they differ from conventional onshore ones.  Several commonly encountered geohazards and logistical challenges including vessel selection, laboratory testing, and UXO risk will be discussed by highlighting examples and lessons learned from several U.S. East Coast wind farm projects.

Biosketch
Dr. Mohamed Mekkawy has over 13 years of experience in complex offshore and near-shore projects. Dr. Mekkawy is a technical expert on site investigation and design of coastal and offshore structures with emphasis on design of deep foundations, design on soft soils, and integration of geotechnical and geophysical data for managing subsurface risk.  His responsibilities include technically and commercially managing integrated projects in the areas of offshore renewables, and ports and harbors.  Dr. Mekkawy is a Principal Engineer at Hana Engineers & Consultants.