Harvesting the energy of sea waves using capacitance

[Baluncore]

Yet a signal cable that runs beneath the ocean experiences capacitance, acting as a capacitor "plate" surrounded by another capacitor "plate".

The cable is a balanced twisted pair or coaxial transmission line. All the currents are balanced and internal. It is inside a steel wire armoured case. The seawater is quite irrelevant.

Why would resistance matter for the sea water if we are accumulating charge and not current?

Because you are not accumulating charge. Capacitor charge is constant while the capacitance and voltage are changing. Charge is being pumped by the change of capacitance. The flow of charge takes place at two different fixed voltages.
A flow of charge is called a current.

What about bottle capacitors that were used in Tesla era, where bottles were placed in a container of salt water and filled with salt water?

The static voltages were measured in thousands of volts, the current was less than 1 mA. Resistance was not important as insignificant power was being handled, uneconomically.

If we are talking about resistance, what is the thickness of the conductor?

It should be sufficient.

What is ocean water conductor's cross section?

It is irrelevant and unmeasurable.

 

[sophiecentaur]

If you don't like those numbers

Can we leave out the algae and storms and all the other environmental factors and imagine an ideal setting:

Basically, it looks like the OP wants to be told that he has a great idea and it's strange why it's not already being used. He wants to discuss an Engineering project but not to consider Engineering reality. Many ideas have been aired in this thread but the OP is clearly not reading them.

It's a waste of time to continue with this.

 

[Baluncore]

It's a waste of time to continue with this.

I was originally exploring the possibilities myself, then I felt I was entertaining a silent crowd who maintained a safe distance, but now I am inclined to agree with you, it is getting very repetitive.

 

[russ_watters]

...then I felt I was entertaining a silent crowd who maintained a safe distance...

You have been, and we thank you for that. It has been both entertaining and more importantly, informative.

 

[berkeman]

It's a waste of time to continue with this.

I was originally exploring the possibilities myself, then I felt I was entertaining a silent crowd who maintained a safe distance, but now I am inclined to agree with you, it is getting very repetitive.

You have been, and we thank you for that. It has been both entertaining and more importantly, informative.

This is a good time to tie off this thread. Thank you all who were trying your best to help the OP.