What you are looking at are a collection of umbrellas/sunshades which are still in their folded state.
the 12mm. bolts holding these down will be strong enough to withstand the strong gales which blow up and down this harbour.
The picture below was taken from the same place as the top photo. The occasion was the blessing of the boats for the start of the salmon fishing season. It was a time when people turned towards the sea and respected it and appreciated what it cold provide rather than turning their backs on it like some of todays town councils.
Below is a link to a local group who provide good training and experience in all things to do with boating.