Abstract Submerged aquatic vegetation (SAV) such as seagrass alters hydrodynamics as a drag force. Many studies have investigated the SAV drag force, but the time scales studied have been short (several days to a few weeks), ignoring seasonal variation, and the spatial scales have been small (several meters). Here, we performed field research and developed a new physical model incorporating seasonally varying SAV morphology (leaf length, leaf width, and shoot density) to investigate the effects of SAV drag force on the current field. We found that SAV attenuated the current velocity 50–70% during the 5-month computational period. Furthermore, the model showed a clear negative relationship between the leaf area index calculated from SAV morphology and current velocity. The physical model developed in this study can facilitate more accurate quantification of organic matter burial rates and the estimation of blue carbon sequestration by considering the SAV drag force.

中文翻译：

---

淹没水生植被 (SAV) 阻力对浅水流体动力学的空间和季节性影响

摘要 淹没的水生植被 (SAV)，如海草，会以阻力的形式改变流体动力学。许多研究对SAV阻力进行了研究，但研究的时间尺度很短（几天到几周），忽略了季节变化，空间尺度很小（几米）。在这里，我们进行了实地研究并开发了一种新的物理模型，该模型结合了季节性变化的 SAV 形态（叶长、叶宽和枝条密度），以研究 SAV 阻力对当前场的影响。我们发现 SAV 在 5 个月的计算期间使当前速度衰减了 50-70%。此外，该模型显示从 SAV 形态计算的叶面积指数与当前速度之间存在明显的负相关关系。