Coasts

Latest news

New measurements from the ocean under the centre of the Ross Ice Shelf have significantly improved our understanding of the complex processes that drive melting in Antarctica.
A little can mean a lot – especially when it comes to the relationship between sea level rise and coastal flooding.
Two reports released today by NIWA and the Deep South National Science Challenge reveal new information about how many New Zealanders, how many buildings and how much infrastructure could be affected by extreme river and coastal flooding from storms and sea-level rise.

NIWA puts a lot of things in the ocean—instruments tied to moorings, floats that dive up and down measuring what’s going on in the water, and video cameras that monitor fish.

Our work

Coastal aquaculture provides one of New Zealand’s biggest opportunities to generate new wealth from the primary production sector.
NIWA is looking for people who have had a long association with the Hauraki Gulf or Marlborough Sounds to help them with a research project on juvenile fish habitats.

NIWA is developing guidelines and advice to help coastal communities adapt to climate change.

Most of the plastic in the ocean originates on land, being carried to the estuaries and coasts by rivers. Managing this plastic on land before it reaches the river could be the key to stemming the tide of marine-bound plastics. The aim of this project is to understand the sources and fate of plastic pollution carried by urban rivers using the Kaiwharawhara Stream as a case study.

Latest videos

Shifting Sands - Tsunami hazard off Kaikoura, NZ

Dr Joshu Mountjoy discusses NIWA's work in assessing the tsunami hazard just south of Kaikoura. 

Find out more about this research. 

Antarctic Coastal Marine Life in a Changing Climate

NIWA marine ecologist Dr Vonda Cummings discusses the likely effects of climate change on marine invertebrates living on the seafloor of the Ross Sea coast.

Next Stop Antarctica

Our Far South is an expedition that aims to raise New Zealanders' awareness of the area south of Stewart Island. Gareth Morgan, Te Radar, scientists and 50 everyday Kiwis are onboard to learn and then share their experience. This is the first video produced by them, showing some of the highlights of the trip so far.

Bringing the harbour back to life

Bringing the harbour back to life

A team sets up a trial on the sandflats at Whangarei Harbour. (Photos: Vonda Cummings, NIWA)

Declining numbers of shellfish is recognised as a problem in many estuaries and coastal areas around New Zealand, and local communities who traditionally gather kai moana are becoming concerned for the future of their customary food source.
In Whangarei Harbour, the Kaitiaki Roopu (caretaker group) has been working with NIWA over the last few years in an innovative project to restore shellfish beds.

Land-use change and sedimentation

Bringing the harbour back to life

Argo deployment reaches new milestones

Ocean acidification - what impacts?

In the wake of the ferries

In the wake of the ferries
 
The sort of wake which can be a concern in Tory Channel. (Photo: Warren Thompson, NIWA)

NIWA-designed ‘Dobie’ data logger.

NIWA has recently completed work to measure the wake waves of the vessels of one Cook Strait ferry operator.
The safety and environmental impacts of wake waves of large commercial vessels are a concern in a number of places around the NZ coast, none more so than Tory Channel, the route of the Cook Strait ferries.

Bathymetric survey helps Cook Strait shipping

Identifying emerging contaminants of concern

Mahia's nuisance sediment

In the wake of the ferries

Rivers: the land-coast connection

Rivers: the land-coast connection

Gravel extraction, Waimakariri River, Canterbury. (Photo: above, Graham Fenwick, NIWA)

(Photo: above, Alistair McKerchar, NIWA)

NIWA scientists are developing models to predict the impact of changes in river sediment loads on coastal erosion. Rivers are a key connection between the land and the sea, carrying sand, gravel, and cobbles down river, and depositing them at the coast. This material is then redistributed and groundup by waves and currents.

What risk to human health?

What risk to human health?

Sequence of calculations to model health risks at a beach, either from swimming or from consumption of raw shellfish.

One of the direct consequences of land-based activities on the coast is the discharge of treated sewage into the sea. Pathogens (bacteria, protozoa, and viruses) in sewage can pose a risk to human health, through people swimming in polluted areas or eating contaminated shellfish.

Special Issue - Effects of land-based activities on the coastal environment

Special Issue – Effects of land-based activities on the coastal environment
New Zealand’s coastline is increasingly affected by land-based activities, particularly intensified agriculture and nitrate runoff, sewage disposal, coastal subdivision and sediment runoff, and heavy metal and contaminate runoff from urban centres into estuaries. Such issues are the focus of increasing and better environmental management practice.

The right time to focus on coasts & oceans

Ocean colour helps fishers

Monitoring Auckland's intertidal zones

A research vessel for all seasons

Vessels rise to Argo challenge

Tide advice for rescue centre

Picture perfect for port

Sounds surveyed

How green's the bay?

Big marine farm zone; small effect

Free workshop coming up

Marine Environment Classification launched

Building better offshore mussel farms

Where are the offshore minerals?

Modelling aquaculture effects in the Firth of Thames

To San Diego, via Chile

Habitat map for taiapure

When paua seek a home

Hear world experts on seafloor mapping

Ocean Survey 20/20 gets underway

What happens to nutrients in estuaries?

Sophisticated sonar for marine habitat mapping

Ashley Estuary in good shape

Bounty and Antipodes Islands surveyed

Up until November 2008, this was a joint quarterly update from the National Centre for Coasts and the National Centre for Oceans. The publication facilitates public, industry, and governmental access to NIWA's expertise and knowledge in coastal and ocean research.

Better tools mean improved knowledge and services

Smart buoy for coastal monitoring

A flexible way to model sediment dispersal

Getting intimate with aquatic sediments

GeoEel sees beneath the seafloor

Winds & Storms - Looking back at the Wahine Storm

Waves

Wave climate around New Zealand

Wave climate around New Zealand
NIWA has recently implemented a large wave model (NIWAM) for the oceans around New Zealand. This is based on WAM, a 3rd generation model which accommodates the processes of wind generation, white-capping and bottom friction, and includes a direct estimate of non-linear energy transfer through four-wave interactions. NIWAM has been established on a 1.125° resolution grid (see image below) covering the Southwest Pacific, New Zealand, Australia and the Southern Ocean.

Tsunami is a Japanese word meaning great wave in harbour

Verifying the wave model
The results from the model hindcast have been compared with data from wave buoys deployed at various times in the past at several sites around New Zealand (shown below).

Foveaux Strait Buoy
This was located in 100 m water depth. Model results were corrected for the effects of limited fetch to the coast before comparison with the data (shown below, click to enlarge).

Mangawhai Buoy
This was located in 30 m water depth, in a site sheltered by surrounding land, and affected by refraction of waves over the seabed topography the variable depth.

NIWA coordinates a network of remote video cameras, called Cam-Era, which regularly monitors coastal and river behaviour in real-time.

Sumatra tsunami recorded at 1-minute sampling intervals at 9 sites:
a) Date/time in NZ Standard Time (UTC+12), with earthquake (EQ) time shown.
b) Elapsed time in hours since the earthquake occurred.

Sumatra tsunami recorded at 5-minute sampling intervals at 19 sites:
a) Date/time in NZ Standard Time (UTC+12), with earthquake (EQ) time shown.
b) Elapsed time in hours since the earthquake occurred.

Tsunami run-up height reached up to 12 m in Khao Lak (Thailand) as shown by damage to tiles on roof.

Solar semidiurnal tide (S2) as an animation.

Waves from Satellites
Waves are available from a number of satellite sensors, including radar altimeters and synthetic aperture radar (SAR).

A radar altimeter aims a narrow beam directly downwards. From the spread in the return signal, the wave height can be measured.

Solar Semidiurnal Tide (S2)
Twice-daily M2 tidal currents animation around the North Island of New Zealand based on a TIDE2D model.

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All staff working on this subject

Principal Scientist - Coastal and Estuarine Physical Processes
Principal Scientist - Ecosystem Modelling
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Coastal and Estuarine Physical Processes Scientist
Hydrodynamics Scientist
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Principal Scientist - Marine Ecology
Senior Regional Manager - Wellington
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Marine Invertebrate Systematist
Principal Scientist - Marine Ecology
Fisheries Acoustics Scientist
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Physical Oceanographer
Principal Scientist - Coastal and Estuarine Physical Processes
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Marine Biologist (Biosecurity)
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Coastal Technician
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Marine Ecology Technician
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Marine Biology Technician
Hydrodynamics Scientist
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Fisheries Scientist
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