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Chapter One of "The Oceanography of Tides"

The 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 chapter that contains some useful stuff.

Contents: 1.1 Celestial Mechanics 1.2 Tide-producing forces 1.3 Equilibrium tides 1.4 The orbits of earth and moon 1.5 The harmonic constituents of the equilibrium tide 1.6 The origins of the major tidal constituents 1.7 Nodal phase 1.8 Longitude formulas.

Download Chapter One: Tidal Forces


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)

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