The seabed is affected by river flows and sea currents and shows a "gourd shape" from northeast to southwest. In addition, the surge environment is complicated. The surveying ship is small medium-sized vessel, which is not wind and wave resistance enough, so swing serously.
3、Water is Shallow
Except the two drainage areas near the northeast is deep, the water depth of other areas is 3-6m or even shallower during low tide.
As the pile foundation measurement is different with traditional full coverage measurement, it only needs to survey the circle area of 100m diameter centering pile foundation. How to determine the measurement scheme after total considering the flow velocity, flow direction, wind direction, water depth and other factors? We also need to ensure data quality and safety of the measurement process. Further more, working efficiency should be improved too. All combine to be a new topic.
2) With POS-25 attitude instrument, which integrates POSMV SurfMaster of Applanix and adopts TrueHeave processing algorithm, the heave accuracy reaching up to 2cm is reliable. It support Fugro MarineStar™ GNSS service and ensure the realtime positioning accuracy is better than decimeter level at any place. Therefore, it is more suitable for the complicated measurement environment of this special wind farm.
1) According to the analysis of pile foundation damage and scouring range, through the following scouring model, it can be seen that there is scouring around the pile foundation and there is worn on the surface of the pile foundation, as shown in Figure below.
3）Blue area is 0.8m lower than last year。
2) Intuitive display of rich results. Mature application model is easy to use. The superposition and comparison of historical results can accurately and intuitively show the size, distribution range, pit volume and comparative change of pile foundation damage.
We firmly believe that with the continuous upgrade and improvement of MS8200 multibeam echo sounder and POS25, it will make more contributions to China's offshore wind power industry.