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Comment on gmd-2024-100
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Researchers developed an advanced modelling approach combining the SWASH wave model with the TrackMPD particle transport model (v3.0) to simulate the transport and deposition dynamics of both floating and sinking microplastics in nearshore wave-dominated environments. The model addresses key challenges in predicting plastic pollution fate in coastal zones, which act as potential sources or sinks for plastic transport to the open ocean.
Abstract. Potentially acting as a source or a sink for plastic pollution to the open ocean, nearshore waters remain a challenging context for predicting the transport and deposition of plastic debris. In this study, we present an advanced modelling approach based on the SWASH wave model and the TrackMPD (v3.0) particle transport model to investigate the transport dynamics of floating and sinking microplastics in wave-dominated environments. This approach introduces novel features such as coupling with advanced turbulence models, simulating resuspension and bedload processes, implementing advanced settling and rising velocity formulations, and enabling parallel computation. The wave laboratory experiments conducted by Forsberg et al. (2020) were simulated to validate the model's ability to reproduce the transport of diverse microplastics (varying in density, shape, and size) along a comprehensive beach profile, capturing the whole water column. Our results underscore the robustness of the proposed model, showing good agreement with experimental data. High-density microplastics moved onshore near the bed accumulating in proximity to the wave-breaking zone, while the distribution of low-density particles varied along the coastal profile depending on the particle properties. The study also sheds light on the primary mechanisms driving microplastic transport, such as Stokes drift, wave asymmetry and settling/rising velocities. Sensitivity analyses on calibration parameters further confirm the robustness of the model results and the influence of these factors on transport patterns. This research establishes the SWASH-TrackMPD approach as a valuable tool, opening avenues for future studies to contextualize laboratory findings within the complexities of real-world nearshore environments and further refine our comprehension of microplastic dynamics across different beaches and wave-climate conditions.
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Comment on gmd-2024-100
AI summary Read the abstract
This study presents an advanced modelling approach coupling the SWASH wave model with the TrackMPD particle transport model to simulate floating and sinking microplastic transport in wave-dominated nearshore environments. The model introduces novel features including resuspension, bedload processes, advanced settling velocity formulations, and parallel computation to improve predictions of microplastic fate in coastal zones.
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