That segmentation is an interesting concept that could be applied in multiple ways.Nearholmer wrote: ↑18 Oct 2022, 8:51amPresumably, the lagoon can be arranged to consist of a series of tanks, rather than just a single huge one, with an “uphill” section, on most days filled either by land-drainage or pumping, that is above the typical high-tide level, which can be kept “in hand” while fully draining the lower section to accommodate the next typical tide.However the lagoon must be effectively drained at low tide as otherwise energy cannot be gained on the fill cycle]
The cost of the land in-land of the coast would be large and there are many other issues too. The best inter tidal range that two similar sized adjacent (built in sea) pools working together could manage would be half the external tidal range. Building significantly tall bunds in the sea, effectively four wall reservoirs, would be a challenge and it hasn’t been done on land in places where a much greater generating head differential is available. Such segmentation could potentially locally load level but the highest energy extracting use of the lagoons would be for them both to be working directly to the adjacent sea. As tide times vary around the UK then there’s an argument for distant multiple lagoons or sites being the most efficient way forward.
As ever, what is technically possible might not be the best use of time, money and (other) resources.