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Hs-Tz scatterplots

These types of plots are widely used in fatigue calculations in offshore engineering applications.

Hs is significant wave height and Tz the mean zero upcrossing wave period. Hs:Tz scatterplots are widely used in offshore engineering in fatigue calculations (which require the joint distribution of individual wave heights and periods). They are also used as a visual quality check, and in wave energy applications to estimate wave power.

A scatterplot is a diagram illustrating the bivariate distribution of two parameters, such as significant wave height and zero-upcross wave period (Hs and Tz). Usually the diagram shows the data plotted on Cartesian co-ordinates. The individual pairs of data can be plotted, as in Fig.1, but more often, given a large number of pairs, the numbers in specified bins are plotted as in Fig.2 (or bins can be colour-coded). Bins here are 1 m by 1 second; they are often 0.5 m by 0.5 second and sometimes bin numbers are contoured. See for example Fig. 5.11 in Tucker & Pitt, 2001.

For a more detailed description of the process including the appropriate mathematical definitions see the Demonstration Products section of the Product User Guide.

Hs-Tz scatterplots have been generated for a selection of locations where in situ data are available for comparison. The initial set of locations is given below with hyperlinks to each image:

55N 175E (N Pacific) – 46070

1N 153W (Equatorial Pacific) – 51028

13N 145E (W Pacific) – 52200

39N 5E (Med) – 61197

49N 13W (NW Atlantic) – 62029

55N 21W (NW Atlantic) – 62606

59N 11W (NW Atlantic) – 64045

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