Groyne Reconstruction in Port of Darłowo, Poland

Introduction & Problem Statement

The shore protection system located east of the Port of Darłowo, Poland, consists of 53 wooden groynes with an average length of approximately 110 meters. Over time, the groynes have experienced substantial damage, necessitating immediate repair to prevent further degradation of the coastal environment. The deterioration of the structures led to disruptions in nearshore water currents, significantly reducing sediment accumulation capacity. Given the fast-paced shoreline erosion in this region, further negative developments in both the coastal zone and the position of the shoreline could not be ruled out.

In addition to structural concerns, groundwater levels also influence the formation and stability of coastal reinforcements. The range between extreme sea level states in the area reaches up to 266 cm, with an average sea level at the Port of Darłowo of 507 cm. The highest sea levels are typically recorded between November and January, peaking in November, while the lowest levels tend to occur between February and March, most commonly in March.

The Solution

The project involved the full-scale reconstruction of all 53 groynes. Damaged and misaligned piles were removed and replaced with longer, reinforced ones, secured with new clamping systems. 2T AquaRockBag® Prime were used to stabilise the seabed. These bags, pre-filled at an off-site warehouse, were easily and efficiently transported and installed at the project location. This process significantly reduced labor time and associated costs.

Additional Benefits

• Efficient Installation: The AquaRockBag® system is quick, safe, and easy to handle, which translates into considerable labor savings.
• Ecological Value: The bags provide a suitable substrate for various invertebrate and faunal species, enhancing local biodiversity.
• Natural Integration: AquaRockBag® absorb wave energy, helping to maintain natural coastal dynamics while minimizing impact on the seabed.