Flood Gulls. A term from the great Rachel Carson’s book Under the Sea-Wind ‘Because they fed on the rising tide, the skimmers were called flood gulls. … The flood gulls circled the island and crossed and recrossed’.

Tidal Intrusion. This refers to the extent to which tidal water finds its way upstream in an estuary at high tide. This can refer to the reach of the tidel inland, and also the consequences of that, particulalry degrees of salinity. (Source here).

See the Glossary here