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A huge amount of sea water surrounded by them might reach DO saturation point, because the area is regarded as a hung tranquil sea water area of a oxidation lagoon, then sea water is purified by the energy of photo-synthesis.
And such area is also purified by the active ecology-cal circulation action.
Clearing away some blocks of the rocks from the embankments may promote the sea water exchange and the diffusion in the basin, because of generation a big tidal current. This phenomena is effective to manage an estuary.