Sea trial challenge
Life rafts sea trial is an important test before passenger and cruise ships can use them. Testing these life rafts are large and expensive operations. They must be tested at sea and with significant wave height greater than 3 m. One of the challenges is to determine the location of the best test site ahead of time.
Sea conditions are best suited for the test around the Shetlands islands in the Northern Atlantic but it is still a large area. Moreover, the actual conditions are often hard to predict and changes rapidly. Finding the most probable test site is normally a mixture of guesswork, experienced seafaring and comparing multiple forecasts. Doing this whilst on board the vessel at sea makes this job harder. One wrong move in the planning of sea route means loss of precious sea time resulting in hefty, additional operational costs.
To improve operations, VIKING Life-Saving Equipment A/S teamed up with DHI to pilot test a new generation of operational services. Code named Wave Hunter; the web service finds the most optimal location to conduct these sea trials. Wave Hunter utilizes new machine learning algorithms and 40 years of readily available high accuracy wave data in DHI’s Metocean Data Portal through an efficient API. It produces dynamic maps and wave forecasts of the most optimal test sites. The maps are forecast 3 days ahead and waves are forecast 5 days ahead. They are updated as frequently as there’s updated weather data available and provides the basis for planning test site routes.
On the 4th March 2020, this services was tested. VIKING scheduled a sea trial and the crew set sail. The test site selected was based on recommendations by Wave Hunter. In this position a significant wave height around 4.0 m was forecast in the morning hours. It was also predicted to gradually decrease to 3.0 m during the afternoon. The crew arrived on site in the morning and actual wave conditions were measured by an on-board wave meter. They recorded a significant wave height of 4.0 m. By the afternoon, the measurement showed 3.1-3.2 m, exactly what the Wave Hunter has forecast, and it was perfect sea trial conditions.
By combining accurate long term hindcast data from existing data bases (or new MIKE Powered by DHI models) and machine learning models, we can achieve lightning fast computation. This enables computing of multiple forecasts in a short time, uncertainty quantification and increasing the robustness of the service.
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