There are different types of coastal protection. Here we talk about the time needed for a sand dune protection system with geotextile sand containers (GSC) Secutex® Soft Rock.
The sand dune protection system uses sand bags and sand containers to protect the water side of a dune against erosion in case of a high-water level and storm waves.
In order to guarantee a long-term solution (up to more than 25 years), sand containers are installed in front of the sand dune on the water side slope and covered with a sand protection layer.
Erosion protection system for sand dunes (exemplarily)
The following factors are used as examples for the calculation of the time required:
Required construction time – Sand dune protection system with geotextile sand filled containers (geometry: 50 m long, 2.50 m high, 1(V):1(H) inclined).
CONSTRUCTION SITE FACILTIY – 2 days
Barricading beach areas, setting up material stores, provide access to the beach, etc.
CLEANING – 1 day
Removal of roots, old structures, etc. Usually you need an excavator and a truck as well as approx. two construction workers.
EXCAVATION and PLANUM – 0.5 days
In order to install the sandbags, the construction site must be prepared first. It is recommended to start with the structure deep enough to prevent scour effects at the toe of the structure. Therefore, the beach sand in front of the sand dune is recommended to be excavated up to three sand containers heights deep. Before installing the first sand container, a smooth planum should be prepared. You will need an excavator, a truck and construction workers.
FILLING and INSTALLATION – 10 days
To fill the 915 sand containers and install them correctly in the dune, if you fill and install about 100 sand containers a day.
SAND PROTECTION and LEVEL THE SURFACE – 3 days
After the installation of the sand containers in front of the dune, the structure is covered with sand. For the exemplarily 50m wide dune section you would need two construction workers, an excavator and a truck with driver.
CLEANING and REMOVAL OF THE CONSTRUCTION SITE – 2 days
Finally, the construction site must also be cleaned and removed.
TOTAL CONSTRUCTION TIME – 18.5 days