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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.
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.
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]
Te Aumiti (French Pass) Tidal Stream Archived 2012-03-19 at the Wayback Machine - Land Information new Zealand; McNab, Robert (1909) Murihiku: A History of the South Island of New Zealand and the Islands Adjacent and Lying to the South, from 1642 to 1835: Chapter 26: Discovery of the French Pass, 1827 Whitcomb & Tombs, Wellington.
Whangārei Harbour is a large harbour on the east coast of the North Island of New Zealand. The harbour stretches from Whangārei City , and the termination of the Hātea River , south east around the Onerahi peninsula and out to the Pacific Ocean at Whangārei Heads .
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 ...
The Kaipara is the largest estuarine harbour on the west coast of New Zealand and provides significant areas of suitable breeding grounds and habitats for juvenile fish. It has fewer problems with water quality than the Manukau , and is the single most significant wetland for west coast fisheries.
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]