The Qigu Lagoon, located within Taijiang National Park, is a remnant of the ancient Taijiang Lagoon, which gradually silted up and merged with the land. Enclosed by the Qingshan Harbor Sandbar, the Wangzailiao Sandbar, the Dingtoue Sandbar and the coastal landmass, this lagoon has relatively calm waters due to the sandbars acting as natural barriers against external waves. This and the tidal circulation make for an ideal habitat for various species to thrive. Local fish farmers have taken advantage of these favorable conditions to cultivate oysters and fish, creating a unique cultural and industrial landscape.

However, the construction of Zengwen Dam has significantly reduced the sediment supply from the Zengwen River. Combined with the impact of monsoons, typhoons, and ocean waves, these factors have accelerated the retreat of the sandbar coastline. In 2023, Typhoon Doksuri struck with great force, causing coastal erosion at Wangzailiao Sandbar and bringing in large quantities of marine debris, including natural driftwood and bamboo. While removing man-made waste, the Taijiang National Park Headquarters (hereinafter referred to as Taijiang HQ) initiated a project to repurpose driftwood and bamboo collected on-site. By constructing overlapping coastal barriers stretching approximately 300 meters at vulnerable points on Wangzailiao Sandbar, the initiative aimed to prevent typhoon-driven marine debris from entering the windbreaks while also helping to retain fine sand carried by monsoons. Continuous monitoring and multiple typhoons later, these barriers have demonstrated their effectiveness in sand accumulation. Although some barriers were toppled during typhoons, they successfully blocked marine debris and mitigated damage to the windbreaks and trails.

Taijiang HQ remains committed to utilizing natural waste materials found on-site to enhance the integrity of the sandbars, transforming these pieces of driftwood and bamboo into coastal barriers that protect the sandbar and help to preserve Qigu Lagoon as a crucial marine conservation area and a place that is vital to the livelihoods and traditions of the local community.