Author(s): Yushu Xie; Jiarui Lei
Linked Author(s):
Keywords: Nature-based solutions mangrove seedling solitary wave wave attenuation hybrid solutions
Abstract: In this study, laboratory experiments were undertaken to investigate a hybrid solution that integrates concrete structures with mangrove seedlings for coastal protection. The concrete structure used is a hollow planter with a hexagonal cross-section, in which a single live mangrove seedling was planted. A total of 20 planters together with mangrove seedlings, were deployed in an experimental flume. The variations of water surface elevation along the wave propagation direction were measured under various solitary wave conditions. The experimental results show that the planters reflect incoming waves, while the mangrove seedlings contribute to wave energy dissipation due to drag effects. Wave reflection (KR) and transmission coefficient (KT) were calculated from the measured wave height data. Within the tested wave conditions, where 0.12 < H/h < 0.36 (H is the solitary wave height and h is the still water depth), KR ranged from 0.07 to 0.12 and KT ranged from 0.82 to 0.94. The hybrid solution effectively reduced wave height by 7% to 18%, with the contribution of mangrove seedlings accounting for approximately 2% to 4% of the reduction. These findings suggest that the planters can mitigate wave energy, thereby offering protection for young mangrove seedlings and potentially enhancing their survival rates.
Year: 2025