Due to climate change, rising water levels lead to more frequent wave overtopping the shore protection dyke. Causing flooding, affecting the works behind the dyke and people’s lives. In addition to the standard wave overtopping calculation solutions, according to the numerical and physical models, the solution to measure the wave overtopping in the actual situation is the most objective and accurate solution. But this is also a more expensive solution, requiring the tester to learn and prepare more carefully. Currently, in Vietnam, there are few studies and published solutions to measure wave overtopping waves in practice. In the world, the Eurtop2018 standard also mentions the CLASH project to measure overflow waves at the port of Ostia, Italy, a coastal port. But when measuring wave overtopping on emerged islands far from the shore, with more difficult measurement conditions, a different measurement method is required than when measuring inshore. In this study, the authors give the measurement solution, the results of measuring the wave overtopping on an offshore island in the Truong Sa archipelago, Vietnam and the notes when measuring the wave overtopping on the offshore emerged island. The study material will be useful as a reference for survey teams to measure nearshore and offshore wave overtopping.
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