Fluidized solidified slurry diffusion range and local scour protection effectiveness around a monopile: a laboratory investigation for an offshore wind farm in Eastern Zhejiang Province, China

The stability of monopile foundations in offshore wind farms is a persistent engineering challenge, and this new laboratory investigation into fluidized solidified slurry (FSS) diffusion and scour protection offers valuable, site-specific data for designers in Eastern Zhejiang Province, China. Understanding the interplay between construction techniques and long-term environmental conditions is paramount, especially as the industry expands into increasingly complex marine environments. The study’s focus on grouting position and its influence on slurry behavior, coupled with a rigorous assessment of post-curing stability, represents a significant step forward. This work builds upon broader efforts to understand coastal dynamics, as explored in [A system dynamics simulation of marine economic development — evidence from Zhejiang province in China], which highlights the need for coordinated approaches to marine resource management. Further, the study’s meticulous examination of flow patterns resonates with observations of phenomena like Langmuir circulation, detailed in [Are these smooth patches langmuir circulation?], demonstrating the complex hydrodynamics at play around offshore structures.

The methodology employed – a 1:100 recirculating-flume model calibrated to represent local conditions – allows for controlled experimentation and the isolation of key variables. The findings regarding slurry fragmentation based on grouting position are particularly noteworthy. The observed increased bed-shear-stress zone associated with side-grouting, and the relative stability of downstream-grouted material, provide actionable insights for optimizing construction practices. The quantitative data on diffusion distances (up to 14.9D downstream for side-grouting) is essential for informed design decisions concerning slurry placement and potential environmental impacts. The fact that the cured slurry layer retained its structural integrity under live-bed conditions up to a V/Vc ratio of 1.65, losing only a minimal amount of mass, reinforces the effectiveness of this protective measure. These results align with broader research on marine ecosystems, such as the study of [Marine epiphytic diatoms: a review of environmental controls and ecosystem roles], which underscores the importance of understanding environmental factors impacting marine life and infrastructure.

The study’s strength lies in its holistic approach, linking grouting position to hydrodynamics and evaluating both the construction and post-curing phases. This integrated perspective is crucial for ensuring the long-term reliability of monopile foundations. While the research focuses on steady-current conditions, it provides a valuable baseline for future investigations considering more complex wave-current interactions and sediment characteristics. The empirical nature of the data, combined with the calibrated model, strengthens the validity of the conclusions and their applicability to the specific geographic location under study. The validated nature of these findings allows engineers to refine their designs and construction methods, mitigating the risk of costly failures and minimizing environmental disruption.

Looking ahead, it will be critical to expand these laboratory investigations to encompass a wider range of environmental conditions and sediment types. Further research should explore the long-term performance of FSS protection layers under cyclic loading and the influence of biofouling. The development of real-time monitoring systems capable of providing integrated data ecosystem feedback on scour depth and slurry integrity will be essential for proactive maintenance and risk management. Can we leverage the principles demonstrated in this study to develop adaptive foundation designs that dynamically respond to changing environmental conditions, further enhancing the resilience of offshore wind farms?