Underwater infrastructure, when it comes to quay walls, oil, gas or outfall pipelines, telecommunications cables, anchorages and fish farms, require inspection on a regular basis. The way that such underwater constructions can be monitored, is indicated by the object itself, the site conditions (accessibility, safety, visibility, turbidity etc.), the final deliverable resolution and accuracy and last but not least, the project’s budget.
An underwater inspection can derive crucial information about the condition of the object inspected, such as the detection of damages along with the evaluation of their current state. According to the means of data collection, the results of the inspection may contain either geometric (metric properties) or imaged-based information or even both.
One of the most important parts of the inspection procedure is the underwater filming of the area of interest. Full HD video recording along with photographic documentation of details of points of interest are carried out by specialized divers, who use state-of-the-art documentation technology. It has to be mentioned that UFR’s underwater inspection can be either diver-based or not. A Remote-controlled underwater vehicle (R.O.V.) with a 4K camera and a USBL system for its position tracking, can support every challenging project at, not accessible by divers, areas.
Simultaneously with the underwater filming, photogrammetry can be undoubtedly indicated in several underwater inspection projects, as it provides us with both metric and photorealistic results and minimizes the always limited diving time. Data acquisition is held by underwater recording (photo and video datasets), which is post-processed resulting in the creation of 3D textured models of quay walls, pipes, cables, seabed or whatever is needed to be documented, as well as orthophotomosaics of any plane (top views, profiles, sections etc.) required.
All results of the inspection are recorded at a Technical Report, in which an extended analysis may include issues such as the current state of the quay walls or a pipeline, the foundation level of a quay wall, the effective depth of the bottom protection, the current state of the bottom protection (washouts, accumulation of rockfill and rubble, removal of the stones of the bottom protection), the existence and width of oversized joints in between sequent piles of concrete blocks etc. required.
All final deliverables are adequately presented and quality guaranteed.