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The Flemish Government approved the Master Plan for Coastal Safety in June 2011. That proposes a series of measures to protect our 67-kilometre-long coast against a 1000-year storm surge. In the same year the Coastal Division started already with the implementation of the measures.
In the Master Plan, all flood risks are established and the risk zones charted. For each risk zone, measures and possible alternatives are studied. The emphasis is primarily put on the realisation of the chosen measures necessary to ensure the coastal safety until 2050. Thereby the expected rise in sea level is being taken into consideration.
In addition to the implementation of the planned measures, it is important to follow closely coastal erosion and the effects of emerging storms. To that end, the Coastal Division has a plane flying over the beach twice a year and also over all dune areas once every three years. Using LiDAR technology (Light Detection And Ranging), height maps of the beaches and dunes are created. This way, the areas where erosion or sedimentation has occurred can be identified and further management can be planned. Since the foreshore (the underwater beach) plays an important role in coastal dynamics, this too is mapped.
To maintain the full sea defence structure so it continues to comply with the proposed level of security, the Coastal Division implements, amongst other, maintenance nourishments. Every six years, a test of the sea defence is made. The last test took place in 2017. Read more about this here.
The measures of the Master Plan for Coastal Security do not only protect us against a 1000-year storm surge, but also against smaller storm surges. With storm surges bigger than a 1000-year storm surge, our coast is not fully protected but the impact will be smaller thanks to the measures taken.
When implementing measures, the Coastal Division applies the principle " tough when needed, lenient when possible”. By carrying out nourishments along our sandy coast, we aim both for a safe as well as an attractive and natural coast.
NOURISHMENTS IN THE FRAMEWORK OF THE MASTER PLAN FOR COASTAL SAFETY
In the table below you will find the risk zones from the Master Plan Coastal Safety, along with the state of play of the implementation of the soft measures in the applicable zone. The indicated maintenance of risk zones covers both scheduled maintenance as well as repairs of heavy storm damage (e.g. after the Sinterklaas storm in 2013 or the Dieter storm in 2017).
Zone |
Status |
---|---|
De Panne Centrum |
Carrying out replenishment: 2011 Maintenance: 2017 |
Sint-Idesbald - Koksijde Centrum |
Carrying out replenishment: 2011 Maintenance: 2017 |
Koksijde - Gilles Scottlaan | Dune passage incremented and remade: 2013 |
Middelkerke - Westende |
Carrying out replenishment: 2013 - 2015 Maintenance: 2017 |
Oostende - Mariakerke & Raversijde |
Carrying out replenishment: 2014 Maintenance: 2018 |
Oostende Centrum |
Carrying out replenishment: 2013 Maintenance: 2018 |
Oostende - Oosteroever | Carrying out replenishment: 2014 |
De Haan - Wenduine |
Carrying out replenishment: 2012 Maintenance: 2014, 2016, 2017, 2018 |
Blankenberge |
Carrying out replenishment: 2014 - 2015 + use of dredged sand from harbour channel |
Knokke-Heist | prior to the planned replenishments in 2012, 2013, 2014, 2015 en 2017 |
In addition to the planned nourishments in the risk zones, in the period 2011-2018, several smaller nourishments were implemented in other locations on the coast in order to maintain in these locations, the robustness of the sea defence structure. In addition, the Coastal Division carries out yet another type of replenishment: the foreshore replenishment. In October 2017 such a replenishment was carried out in Nieuwpoort. Read more on that here.
Sand replenishments are unmistakably one of the least environmentally harmful interventions in the context of sea defence structures and protection against flooding. The ecosystem is nonetheless temporarily affected by the applying of large volumes of sand on our beaches.
To limit as much as possible the potential impact and to promote as much as possible the repair of the marine environment, the Coastal Division commissioned a study that should allow the sand replenishments (or hydraulic-filling) to be carried out in as environmentally-friendly a manner as possible. The starting point in this regard is the so-called ecosystem approach, which leads to a complete and comprehensive understanding of beach ecology.
In addition, a monitoring programme was put together for large projects. By means of T0-monitoring (this is an examination of the ecology before any human interventions takes place) and T1, T2, T3 etc. monitoring (at regular intervals after the works), it is possible to determine the environmental impact of large projects shortly after the works and how the environmental recovery process is evolving. The works can then be adjusted where necessary (and if possible). More importantly, however, these samples and studies provide a lot of useful information for potential future projects and serve as input in assessing their environmental impact.
HARD SEA DEFENCE
In some places, protection through a wider and higher beach is inadequate. Therefore, in those places, additional measures are carried out with the construction of storm return walls, a wave damping development, a wider dike or a storm surge barrier.
2012: In Ostend, the Albert I promenade was reinforced across the full length and provided with a fully removable mobile storm surge barrier. Following the renovation of the sea dike promenade, a part of the historic bastion, the Zeeheldenplein at the level of the Klein Strand was completely renovated. Read more.
2014:
2016:
2018: In spring the Coastal Division starts with the construction of a storm surge barrier in the harbour channel of Nieuwpoort. This should protect the city and the hinterland against high water levels during heavy storms. The work will take morethan three years. Read more.
Also in the future, the Coastal Division will continue to work on a safe shore. The projects below are fully in the preparation phase.