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the wave will be moving opposite to the current
Wave HeightFive factors affect the growth of wind waves. First, the wind speed must be blowing faster than the transfer of energy from wave crest to wave crest. The second factor is the amount of time the wind blows, or wind duration. The third factor is the fetch, the uninterrupted distance over the sea for which the wind blows without a change in direction. In the Solent, for instance, the fetch is limited by the surrounding coast of the mainland and the Isle of Wight and is rarely more than 10 miles. At sea it can be thousands of miles.As waves enter shallow water their speed decreases, wavelength decreases, and height increases. Waves therefore tend to break in shallow water, for example over a bar at the entrance to a harbour. If the tide direction is against the wind, this will also increase wave height and decrease wavelength. Shallow estuaries and harbours such as Salcombe, Chichester and Carteret will experience large waves in an strong onshore wind, particularly with an ebb tide, and must be avoided in such winds. So in total wave height is affected by: Wind speed Wind duration Fetch - distance of wind over water Depth of water Direction and speed of tide
There is correlation of course, because it is a change from deeper to shallower water that will increase tidal flows
... I could see that the current causes the waves in the center to travel a little slower than on the outsides, and that this bends the wave train, and now the waves on the left and right were converging towards the center where they added their energy and height...
... My opinion is that this effect I am talking about does not exist if the current is the same all the way across the body of water ........ In the English Channel for example, the current varies considerably depending on distance from shore and local flows around islands or headlands. Where the current is locally different from the "upwind" waters, there will be bending of the wave train causing areas with larger seas and some with smaller seas, depending on whether the waves converge or diverge. Confused seas and rogue waves usually result from waves arriving at different angles from various sources. When 2 or 3 wave crests coincide, a short lasting big wave is created.
What makes you state that waves maintain a constant period when entering the counter current?
I can see that your explanation "the current causes a change in wave lenght" would apply to the limited area of where the waves enter a counter current, but not to the whole length of the body of water. Isn't it a bit like running onto an airport conveyor belt walkway, where your body and legs catch up to the new increased air speed after a few strides?
I think my explanation only works when there is a difference in current speed left and right. Yours does not take that into account,
Current with wind does the opposite and we get smaller waves.