Station · coastal

Ossett Head

The plain case. Semidiurnal, symmetrical, and nothing to argue with.

48 hours · height in metres above chart datum · all eight constituents

Mean spring range: 4.34 m
Mean neap range: 2.14 m
MHWS: 5.12 m
MLWS: 0.78 m
Form factor: 0.07
Classification: semidiurnal

Open-coast station. Close to a plain semidiurnal tide.

Exposed headland, steep-to, rock. Close to the textbook.

The constituent table

Amplitude and phase lag at Ossett Head. The periods are astronomy and are the same everywhere; the two right-hand columns are the whole of what a tidal analysis produces.
Id	Constituent	Period, h	Amplitude, m	Phase g
M2	Principal lunar semidiurnal	12.4206012	1.62	302°
S2	Principal solar semidiurnal	12.0000000	0.55	344°
N2	Larger lunar elliptic semidiurnal	12.6583475	0.31	284°
K2	Lunisolar semidiurnal	11.9672348	0.15	342°
K1	Lunisolar diurnal	23.9344697	0.08	108°
O1	Principal lunar diurnal	25.8193417	0.07	334°
P1	Principal solar diurnal	24.0658902	0.03	104°
M4	Shallow water overtide of M2	6.2103006	0.05	190°

High and low water, 48 hours

Turning points of the curve above, read off the same series that draws it.
Time	Event	Height, m
day 1 04:34	Low water	0.55
day 1 10:33	High water	5.51
day 1 16:53	Low water	0.29
day 1 22:58	High water	5.58
day 2 05:13	Low water	0.47
day 2 11:13	High water	5.59
day 2 17:32	Low water	0.22
day 2 23:38	High water	5.62

Survey sheet OH/4

206 soundings on run lines 55 units apart, 4 of them drying heights, deepest 48.8 m. One stroke on the sheet — the coastline — and no depth contours. Why.

Get Wrackline

Wrackline is an aid to planning and is not a substitute for an official tide table. Do not navigate on it.