And your point is? Unless you know what you are looking at in those images, you can't tell if one marsh is fresh or brackish. It is not just a question of whether the marsh is there or not. Salt marsh is not as productive as brackish or fresh marsh. The marsh in the bottom right of that second aerial is salt marsh. Primary production is not nearly as high as in brackish marsh, and diversity is low.
Also, no one has ever said the weirs will stay closed for 6 months. There is no way, because the weirs are opened on full moons. Also, it is only closed when the salinities get to a certain level in the marsh.
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