Altough the automatic translation is barely readable the VEJA article sums it pretty well I'm afraid
The first one of them is the absence of specific marks in the track of the airport. These marks are formed when the water under the tires of an aircraft that is skidding esquenta until the boil point. They are clear, very different of the black marks caused by normal lockwires.
Interesting one... first time I hear it. Anyone with further info on this topic (specific and distinct tire marks for aquaplaning aircrafts) ?