Scour Mechanics in Riverine and Marine Structures

Scour—the erosion of sediment around structural elements due to flowing water—is a primary threat to both riverine and marine infrastructure. Local scour arises from concentrated vortices at the base of piers, monopiles and pipelines, whereas general scour reflects broader channel or seabed adjustments. These phenomena are governed by flow dynamics, sediment properties and structural geometry, often described using dimensionless parameters such as the Keulegan–Carpenter number and Reynolds number. The temporal evolution of scour holes progresses towards an equilibrium depth determined by the balance of erosive and resistive forces. Combined wave–current regimes in marine environments introduce additional complexity, altering vortex strength and sediment transport pathways. Climate change, through increased flood magnitudes and sea-level rise, exacerbates uncertainty in scour prediction, demanding robust risk assessment and adaptation planning. Recent progress spans physical modelling in flumes and wave basins, advanced numerical simulations, and innovative monitoring techniques—ranging from acoustic profilers to vibration-based sensors. Effective scour management underpins the resilience of bridges, offshore wind foundations, underwater pipelines and flood defences worldwide, necessitating integrated strategies for prediction, monitoring and mitigation.

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Scour Mechanics in Riverine and Marine Structures publication trend

The graph below shows the total number of articles in scour mechanics in riverine and marine structures across all publications each year (not limited to Nature Index journals).

Technical terms

Local scour: Erosion of sediment in the immediate vicinity of a structure due to accelerated flow and vortex formation.

General scour: Widespread lowering of the bed profile within a river or seabed channel, often driven by enhanced flow capacity.

Horseshoe vortex: A curved flow pattern that develops around the base of a structure, intensifying local sediment removal.

Keulegan–Carpenter number: Dimensionless parameter expressing the ratio of inertial to viscous forces in oscillatory flow conditions.

Fragility curve: A probabilistic model depicting the likelihood of structural failure as a function of loading intensity.

References

1. A bridge scour risk management approach to deal with uncertain climate future. Transportation Research Part D Transport and Environment (2023).
2. The Science behind Scour at Bridge Foundations: A Review. Water (2020).
3. Scour Protections for Offshore Foundations of Marine Energy Harvesting Technologies: A Review. Journal of Marine Science and Engineering (2021).
4. Scour development around a jacket structure in combined waves and current conditions compared to monopile foundations. Coastal Engineering (2019).
5. Numerical investigation of wave-plus-current induced scour beneath two submarine pipelines in tandem. Coastal Engineering (2020).
6. Scour Damage Detection and Structural Health Monitoring of a Laboratory-Scaled Bridge Using a Vibration Energy Harvesting Device. Sensors (2019).