There are 4 difficulties in surveying area investigation and assessment.
1、Flow speed is very quick
The wind farm is located on the North Bank of Guanhe River entance to the sea. There are several rivers of Xinyi River, Guanhe River and Wuguan River intersecting flow into the sea at this place. The water flow situation is relatively complex here. The flowing velocity is quick and the sand concentration of seawater is high.
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.