Coastal Hazards

The Tasman District has over 700km of open coast and estuary shoreline. This ranges from rocky and cliffed landforms to dunes, sandy beaches and sandspits.

Natural processes of coastal wind and wave erosion and seawater inundation result from wind, tide and wave action, particularly on sandy and/or low-lying shorelines. Erosion and inundation hazard risks occur to land, and especially to built developments on that land, over or adjacent to the shoreline.

Coastal erosion and inundation hazard risks increase during periods of extreme high tide, strong onshore wind and storm surge. These hazards may be locally generated within Tasman and Golden Bay, or may result from more distant events such as cyclonic or tsunami events propogating larger waves into the bays, as occurred for example during Cyclone Drena in 1997.

The present day extent and probability of various coastal hazard risks are both expected to increase as a result of climate change projections of increased wind frequency and intensity and sea level rise.

Coastal Erosion

Read about coastal erosion hazards caused by wind and waves.

Port Motueka Groyne - Jackett Island Erosion

Details of the interim Environment Court decision, interim action plan works and reports.