Abstract
In Denmark it is the landowners responsibility to get a permit for coastal protection and pay for it. On natural coasts without man made structure, a new concept consisting of a sandbuffer with a sleeping defence has been implemented on two locations. The sandbuffer must ensure that the sleeping defence must be covered with sand at all time. The optimization of the sandbuffer is done numerically using Mike21 FM Shoreline Model, and by surveying the performance in Interreg project Building With Nature.
Highlights
If a house is within 2 times the maximum dune face retreat during a very severe storm, one of the requirements for using revetments of rocks are met
To compensate for the morphological scales on the coast, the buffer of sand must extend the length of the revetment, both upstream and downstream
The second step has been using Mike 21 FM Shoreline model to model the distribution and decay of a sandbuffer with different spatial parameters depending of the exposure of the coast. 16 calculations has been done for each degree of exposure. / where the nourishment is evenly distributed over the active coastal profile, 6 where the coastline orientation varies and 3 different layouts of the beach nourishment
Summary
PRICIPLE FOR CCOASTAL PROTECTION SCHEME On natural sandy coast in Denmark a coastal protection may not reduce the natural dynamics, change the coastal landscape or cause leeside erosion. Sand nourishment is the optimal solution in many ways, and it is the most cost effective. Some landowners wants additional safety if their house is very close to the cliff. If a house is within 2 times the maximum dune face retreat during a very severe storm, one of the requirements for using revetments of rocks are met.
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