Glossary
| Term | Description |
|---|---|
| IECS | Institute of Estuarine and Coastal Studies |
| Inshore | Areas where waves are transformed by interaction with the seabed. |
| Intertidal | The area between the MHWS and MLWN tidal levels in a coastal region |
| Intertidal zone | The zone influenced by tidal action commonly taken between some upper limit such as MHWS and a lower limit such as MLWS. |
| Inverse barometer effect | The inverse response of sea level to changes in atmospheric pressure. A static reduction of 1.005 mb in atmospheric pressure will cause a stationary rise of 1 cm in sea level. |
| Invertebrates | Animals lacking a dorsal column of vertebrae or a notochord. |
| Ipswichian | The last interglacial - A warm geological period of high sea levels about 140,000 years ago. |
| Isobath | Line connecting points of equal depth, a seabed contour. |