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Rubble mound breakwaters are coastal defense structures that protect harbors and beaches from the impacts of both littoral drift andstorm waves. They occasionally break, leading to catastrophic damage to surrounding human populations and resulting in hugeeconomic and environmental losses. Ensuring their stability is considered to be of vital importance and the major reason for settingup breakwater monitoring systems. Terrestrial laser scanning has been recognized as a monitoring technique of existinginfrastructures. Its capability for measuring large amounts of accurate points in a short period of time is also well proven. In thispaper we first introduce a method for the automatic extraction of face geometry of concrete cubic blocks, as typically used inbreakwaters. Point clouds are segmented based on their orientation and location. Then we compare corresponding cuboids of threeco-registered point clouds to estimate their transformation parameters over time. The first method is demonstrated on scan data fromthe Baiona breakwater (Spain) while the change detection is demonstrated on repeated scan data of concrete bricks, where thechanging scenario was simulated. The application of the presented methodology has verified its effectiveness for outlining the 3Dbreakwater units and analyzing their changes at the millimeter level. Breakwater management activities could benefit from this initialversion of the method in order to improve their productivity

Terrestrial laser scanning for geometry extraction and change monitoring of rubble mound breakwaters