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New Zealand's situation (like Iceland's) is a small island in a large basin, and the peaks and troughs of the M2 tides sweep continuously anticlockwise around New Zealand. When it is high tide on the west coast, it is low tide on the east coast, and vice versa: the straightforward notion of tidal bulges aligned with the Moon is insufficient.
Historical ocean sampling locations within Cook Strait, New Zealand. Global surface elevation of the M2 ocean tide (NASA). [18] This computer animation shows the peaks and troughs of the M2 tides sweeping anticlockwise around New Zealand. When it is high tide on one side of Cook Strait, it is low tide on the other side.
An analysis in 2004 of long term records from four New Zealand tide gauges indicated an average rate of increase in sea level of 1.6 mm a year for the 100 years to 2000, which was considered to be relatively consistent with other regional and global sea level rise calculations when corrected for glacial-isostatic effects. [8]
Tide tables, sometimes called tide charts, are used for tidal prediction and show the daily times and levels of high and low tides, usually for a particular location. [1] Tide heights at intermediate times (between high and low water) can be approximated by using the rule of twelfths or more accurately calculated by using a published tidal ...
It has a high-tide area of 68 km 2 (26 sq mi) and a low-tide area of 18 km 2 (6.9 sq mi). [4] Te Motu Island is located in the harbour. The settlement of Kawhia is located on the northern coast of the inlet, and was an important port in early colonial New Zealand. [5]
A king tide is an especially high spring tide, especially the perigean spring tides which occur three or four times a year. King tide is not a scientific term, nor is it used in a scientific context. The expression originated in Australia, New Zealand and other Pacific nations to
In the southern hemisphere this direction is clockwise. On the other hand, M 2 tide propagates counterclockwise around New Zealand, but this is because the islands act as a dam and permit the tides to have different heights on the islands' opposite sides. (The tides do propagate northward on the east side and southward on the west coast, as ...
Tide tables forecast the time of the next high water. [6] [7] The difference between these two times is the lunitidal interval. This value can be used to calibrate tide clock and wristwatches to allow for simple but crude tidal predictions. Unfortunately, the lunitidal intervals vary day-by-day even at a given location.