THE NUMERICAL ANALYSIS OF MIXING DEPTH AND THE THICKNESS OF BBL CONSIDERING THE SUBMERGED AQUATIC VEGETATION AND WIND STRESS
ICCE 2022
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How to Cite

Matsumoto, H., & Nakayama, K. (2023). THE NUMERICAL ANALYSIS OF MIXING DEPTH AND THE THICKNESS OF BBL CONSIDERING THE SUBMERGED AQUATIC VEGETATION AND WIND STRESS. Coastal Engineering Proceedings, (37), management.65. https://doi.org/10.9753/icce.v37.management.65

Abstract

Mangrove forests, salt marshes, and seagrass meadows have a vital role in mitigating global warming (Duarte et al.,2013). They contribute about 50 percent of carbon burial in ocean sediments (Duarte et al., 2013). On the other hand, submerged aquatic vegetations (SAVs) significantly affect the mixing depth (the thickness of the upper layer), resulting in a change in carbon flux with the atmosphere. According to the numerical simulations in the previous studies, mixing depth becomes larger with increasing SAV's density and decreasing SAV’s height (Herb et al., 2005, Vilas et al., 2017). On the other hand, Coates et al. (2009) indicated that wind stress was not crucial for mixing depth in SAV’s meadow since it did not change the vertical turbulent kinetic energy (TKE) profile, except in the thin surface layer, thus mixing depth became similar even though wind speed varied under the effect of SAVs (Coates et al., 2009). In addition, it is crucial to estimate the thickness of the benthic boundary layer (BBL) because dissolved inorganic carbon elucidates from bottom sediments, affecting carbon flux. Therefore, we aim to clarify how wind stress impacts the mixing depth and thickness of BBL with SAVs.
https://doi.org/10.9753/icce.v37.management.65
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References

Coates, M.J. and Folkard, A.M. (2009): The effect of littoral zone vegetation on turbulent mixing in lakes, Ecological Modeling, ELSEVIER, vol. 220, pp. 2714-2726.

Duarte, C.M., Losada, I.J., Hendriks, I.E., Mazarrasa, I., and Marbà, N. (2013): The role of coastal plant communities for climate change mitigation and adaptation. Nature Clim Change, SPRINGER NATURE, vol. 3, pp. 961–968.

Herb, W. R. and Stefan, H. G. (2005): Dynamics of vertical mixing in a shallow lake with submersed macrophytes, Water Resources Research, WILEY-BLACKWELL, vol. 41, W02023.

Vilas, M.P., Marti, C.L., Adams, M.P., Oldham, C.E., and Hipsey, M.R. (2017), Invasive Macrophytes Control the Spatial and Temporal Patterns of Temperature and Dissolved Oxygen in a Shallow Lake: A Proposed Feedback Mechanism of Macrophyte Loss, Frontiers in Plant Science, FRONTIERS MEDIA S.A., vol. 8, 2097

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Copyright (c) 2023 Hiroki Matsumoto, Keisuke Nakayama