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 6 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.
This index was generated using NIWA’s operational wave forecasting model NZWAVE-12.
More information on this dataset and how it relates to our environmental reporting indicators and topics can be found in the attached data quality pdf.
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