During the harbour extension works at Zeebrugge a new armour unit has been developed : the HARO. Tests in wave flume and wave tank showed a very good hydraulic stability, comparable to that of the dolos. Static and dynamic loading tests in the laboratory and pendulum tests on site confirm the HARO's excellent structural performance, comparable to that of the cube. Based on the results of exhaustive investigations one can state that the HARO is a safe and economical solution for the protection of maritime structures. INTRODUCTIONThe HARO is a plain concrete block for the protection of maritime structures (breakwaters, sea walls, groynes ...) against wave attack. It found an extensive application in the harbour extension works at Zeebrugge. It is also currently being used for the Gwadar Port in Pakistan. The name HARO is registered by HAECON N.V.The HARO is a compact concrete block with a large central opening ( fig. 1). Both short sides are made wider at the base. The corners are asymmetrically tapered in plan. Thanks to the large central opening, the protuberances at the short sides and
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