The horizontal force (along with wind force) on a floating object can be oppose by anchore it properly ( by using four long distance anchors ) so that the vertical force remain almost same. This vertical force is useful. For example It can be very much useful as easily increase this vertical force by increasing the size of the object. This bidirectional vertical force is very much suitable for pumping purpose. By using the vertical force of tidal wave sufficient amount of water pumping possible for hydro power generation.
This is the right way to collect maximum amount of energy from tidal wave. It can solve the demand of world's electricity.