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This dataset was first added to MfE Data Service on 16 Oct 2019.
43821b64-e178-caee-8b56-7d80b24b0618
eng
utf8
series
series
Stats NZ
Australia
pointOfContact
2019-10-14
ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
1.1
4326
Ocean and coastal extreme waves (4m), 2009
These data estimate the occurence of extreme wave events in coastal and oceanic waters for 2009, particularly for wave events where significant wave height exceeds a threshold of 4 metres and for a period of at least 12 hours. Significant wave height is defined as four times the square root of the variance of sea surface elevation due to wave motion.
The data have been commissioned from NIWA in order to quantify the occurrence of extreme wave events in New Zealand on an annual basis. However, it is apparent that NIWA's primary reason for collecting these data is to develop as accurate a picture as possible of what is happening at present with extreme waves. I.e. while it is possible to compare data over time to create a longer-term series of data on extreme waves - data are not completely comparable over time because the resolution of data has increased over time (allowing more and more accuracy of data over time - but reducing long-term comparability).
NIWA has advised that international data maybe available that provides a longer time series of extreme wave events (at lower resolution). Further work is needed to look into this.
completed
Stats NZ
New Zealand
publisher
asNeeded
New Zealand
theme
ANZLIC Jurisdictions
Version 2.1
2008-10-29
http://asdd.ga.gov.au/asdd/profileinfo/anzlic-jurisdic.xml#anzlic-jurisdic
ANZLIC the Spatial Information Council
custodian
CLIMATE-AND-WEATHER
CLIMATE-AND-WEATHER-Meteorology
CLIMATE-AND-WEATHER-Extreme-weather-events
MARINE-Meteorology
MARINE-Coasts
OCEANOGRAPHY
OCEANOGRAPHY-Physical
theme
ANZLIC Search Words
Version 2.1
2008-05-16
http://asdd.ga.gov.au/asdd/profileinfo/anzlic-theme.xml#anzlic-theme
ANZLIC the Spatial Information Council
custodian
unclassified
Creative Commons Attribution 4.0 International
license
grid
eng
utf8
climatologyMeteorologyAtmosphere
oceans
environment
https://data.mfe.govt.nz/layer/104076-ocean-and-coastal-extreme-waves-4m-2009/
series
series
This index was generated using NIWA’s operational wave forecasting model NZWAVE-12 (Gorman, 2016). This model has a 12-kilometre resolution and models wave heights. The model was created using:
• wind from NIWA’s NZLAM-12 weather forecast model
• swell from NIWA’s global wave forecast model
We use a duration threshold of 12 hours as it allows semi-diurnal tides to cover their full low water to high water range. This means that there was both a high tide (when overtopping and damage to coastal infrastructure, for example, is most likely) and a low tide during an event.
Gorman, R (2016). Extreme wave indices for New Zealand coastal and oceanic waters. NIWA Client Report HAM2016-014 prepared for the Ministry for the Environment.
unclassified
Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/
license