If the sea level were rising, I would expect to see it in many other places. However, if the island near the mouth of the river is sinking, think New Orleans, due to engineering the water flow, that would seem more plausible.
Nope, dont ya know, it only happens in certain spots. Unlike a glass of ice cubes melting, where the water rises uniformly, increased water volume caused by Global Warming(TM)only effects areas that can be used to promote it. It's a very self serving phenomena, and a bit narcissistic. Unlike other environmental changes, Global Warming(TM) is very savy when it comes to marketing itself.
It isn’t climate change. The current Jin the Bay scours that side of the Bay. That’s why Poplar Island almost disappeared. Best solution is to sink old wooden barges around Tangier where the scour is strongest and fill them with dredging spoil from the harbors.