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"The Oceanography of Tides"  Chapters 1-4

The Oceanography of Tides Chapters 1-4The Oceanography of Tides is by Prof. Zygmunt Kowalik (University of Alaska, Fairbanks), and Dr John Luick (Austides Consulting and the South Australian Research and Development Institute). This is a draft of the first four chapters.

Chapter I: Tidal forces
Chapter II: Basic equations
Chapter III: Tidal currents
Chapter IV: Tide distribution and tidal power

Download Chapters 1-4


Free, fast, powerful tool for constructing computational grids for ROMS (Regional Ocean Modelling System). GridBuilder replaces the venerable Seagrid software by Charles R. Denham.

Download GridBuilder Download INSTRUCTIONS file (PDF)

This is a Matlab toolbox that should install and work with versions of Matlab 2014b and above. It has been developed and tested on Windows 7 but should work on any platform that can run a compatible version of Matlab. Installing the toolbox will install all code and data files and help documentation required to run GridBuilder. To install the toolbox double click on the GridBuilder.mltbx file from within Matlab.

Download GridBuilder.mltbx

  • The climate is heading for a tipping point that could make the planet uninhabitable.
  • It could cause temperatures up to 5C higher than pre-industrial averages, and rises of sea level of between 10 and 60 metres.
  • Current global efforts to curb emissions are "unlikely" to prevent the dangerous situation.

Download Steffen et al PNAS 2018 (PDF)

How to transfer a vertical datum between islands or coast and island

Let’s say we want to compare the vertical level of an island benchmark with an onshore benchmark which has been levelled into a national datum. There are a number of ways this can be done. Here I discuss three of them.

Download Austides Island Datum Transfer

TPXO to ROMS Express v. 4.1

This Matlab function prepares a ROMS forcing file directly from the TPXO global tidal model. ROMS is a hydrodynamic model primarily designed for coastal shelves, estuaries, and regional seas.This new version of TPXO2ROMS (TPXO2ROMSv4pt1) reads from the new TPXO 8 atlas. The most important harmonics in TPXO8 are at 1/30 degree resolution (as opposed to 1/4 degree for version 7.2 and earlier). There are other improvements in TPXO 8 as well (see here). You need to download the netcdf files (there are now two per harmonic plus the new grid). Four of the harmonics (MM, MF, MS4, MN4) are at 1/6 degree. I am not sure my interpolation scheme is working properly for them - you can try it for your area and let me know - it is also possible there are some flaws on the database. I will update the software once this is established.

Download TPXO2ROMS v4.1

Australian Tidal Handbook

Australian Tidal HandbookI wrote this handbook in 2004 under contract to the National Tidal Centre (Bureau of Meteorology). My goal was to de-mystify tidal practice. That turned out to be harder than I thought. Anyway, here is the Australian Tidal Handbook.

Download AustTidal Handbook