Hard to tell from the photos but it looks to be ~ a 2mm veneer that is cupping badly. Replacing it will be difficult as you will struggle to get anything to match the level of wear and grain raising that is there. Although it does look like someone has tried something in the past, that rectangular patch that has been pinned in place is a bit weird.
Can you push the edges of the veneer flat without hearing any nasty cracking sounds?
If so you could try flooding the area underneath with some wood glue titebond II or III would be ideal then clamp the edges of the veneer down with some cauls, or if you can; borrow a vacuum bag and pump. There is no guarantee this will work but if it does I'd consider flooding the edges of the veneer with some medium consistency CA glue and then using an accelerator to set it . After this you will need to protect the veneer from further moisture damage a good quality varnish would work but you'll need at least 3 coats. You could also consider sealing it with some low viscosity expoxy.
Hard to tell from the photos but it looks to be ~ a 2mm veneer that is cupping badly. Replacing it will be difficult as you will struggle to get anything to match the level of wear and grain raising that is there. Although it does look like someone has tried something in the past, that rectangular patch that has been pinned in place is a bit weird.
Can you push the edges of the veneer flat without hearing any nasty cracking sounds?
If so you could try flooding the area underneath with some wood glue titebond II or III would be ideal then clamp the edges of the veneer down with some cauls, or if you can; borrow a vacuum bag and pump. There is no guarantee this will work but if it does I'd consider flooding the edges of the veneer with some medium consistency CA glue and then using an accelerator to set it . After this you will need to protect the veneer from further moisture damage a good quality varnish would work but you'll need at least 3 coats. You could also consider sealing it with some low viscosity expoxy.