Light revetments built-in into artificial dunes

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Shore protection structure built-in into artificial dune (Polish experience)

On the Polish coast, there are numerous places which are subject to more or less serious erosion. The maritime and coastal economy, including the coastal management and protection, is ruled by the Maritime Offices – governmental institutions subordinate to the Ministry of Maritime Economy. Each of the Maritime Offices (in Gdynia, Słupsk and Szczecin) has the Inspectorate of Coastal Protection, responsible for defence measures undertaken at individual shore segments.

According to the present state-of-the-art and current trends in coastal engineering, artificial beach nourishment and formation of artificial dunes is an optimal protective measure. This solution requires neither the concentration of large funds in short time nor the engagement of sophisticated equipment and technologies. Moreover, it is the best from the ecological point of view, because provides aesthetics of the venture and sustainable coexistence with natural coastal forms. Finally, artificial beach nourishment is recommended as the primary shore protection measure on strength of the Polish parliamentary “Law on the establishment of a multi-year programme of shore protection” (of 18th April 2003).

Gabion revetment built-in into artificial dune

During heavy and long-lasting storms, the artificial beach and dune can be washed away. Therefore, at shore segments with valuable objects in the hinterland, it is recommended to supplement the above soft solutions by “invisible” structures, namely light revetments built-in into artificial dunes. These hidden revetments are assumed to constitute a kind of “second line of defence” during extreme storms, when the beach disappears and the dune can be breached. Most often, these additional revetments are built as gabion structures (see figure). If the revetment is uncovered after a storm, the artificial beach and dune should be rebuilt. Possible damages of the revetments ought to be repaired before.

Experience has shown that very high storm waves accompanied by storm surges indeed cause disappearance of the beach under water. In such conditions there is wave run-up directly on the dune slope which in turn results in rapid dune erosion. A situation of this kind took place e.g. at Hel Peninsula in Poland where a heavy storm in January 2007 caused the dunes to be partly washed away and only the existence of a gabion revetment built into the dune protected the village of Kuźnica from flooding.

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