2020/10/14 by Zhengyu Hu, Hu, Zhengyu
Earth and Planetary Sciences · Environmental Science · #Aeolian processes and effects #Coastal wetland ecosystem dynamics #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Hydrology and Sediment Transport Processes
paper · pdf · doi:10.48550/arxiv.2010.07148
openalex publication_date 2020/10/14 · openalex created_date 2020/10/22 · openalex updated_date 2026/07/28
Laboratory study was set out to investigate the flow structure and turbulent kinetic energy (TKE) within mangrove forest considering flexible canopies and rigid stems under various wave conditions. Canopies and stems have different effects on turbulence generation. The flexible leaves in canopy scale can promote the dissipation of TKE and the rigid stem scale contribute to the generation of turbulence. Importantly, the difference of TKE with and without vegetation, ΔTKE varied with wave frequency and peaked at 0.833 Hz for the canopy and vegetation-free upper layer, but increased with wave frequency in stem scale. Moreover, TKE in mangrove forest increased monotonically with uw,RMS2 for each stem density. This study proposed a modified model for the TKE prediction within canopy scale considering the role of flexible leaves and rigid stems together. Besides, TKE/uw,RMS2 presented a good correlation with the ratio of wave excursion (Aw) to stem spacing (S), Aw/S and declined rapidly with Aw/S especially when Aw/S <0.1 for both stem and canopy scale. This empirical relationship can be a predictor for TKE within mangrove forest. Further, considering the scale between wave energy dissipation by vegetation and production of TKE, the third model was validated in mangrove forest and predicted well.