Abstract
A groyne is a shore protection structure built perpendicular to the shoreline of the coast (or river), over the beach and into the shoreface (the area between the nearshore region and the inner continental shelf), to reduce longshore drift and trap sediments. A groyne field or system is a series of groynes acting together to protect a beach. Concret is often used as construction material. On the basis of analysis of wave suppression efficiency and stability on the slope of more than one hundred existing shaped massives the new type of coast protecting reinforced concrete blocks – so called “Hexablock” (“Hexablock” was called because of its 6 facets) characterized with higher wave suppression properties, interlocking capacity, stability on the slope and longer life time is proposed.
Highlights
At the last years we are observing change in global mean sea level
Over the period from January 1993 to May 2017, seas level has risen with a rate of about 3 – 4 mm per year, which translated to a global increase in mean sea level of about 8 cm. [1] (Fig. 1)
These phenomena require intensification of activities that may reduce the erosion processes of the coastlines. One of such activities is the improvement of the groyne structure, which is designed to weaken the action of sea waves on the shore
Summary
At the last years we are observing change in global mean sea level. This causes an increase in the erosion processes of the coasts. Detached concrete blocks aim to protect a coast or activities along the coastline (e.g. ports, ship wharf) from wave action. A detached breakwater is a coastparallel structure located inside or close to the surf-zone. Consideration of many factors stipulating development of the process is so difficult that the problem of modeling the real wave streams and their interaction with the coast protecting structures is not fully studied yet. According to the world practice of reservoirs bank protection methods the most efficient one is with shaped concrete blocks
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