Ordnance Datum Newlyn the standard reference level for OS maps throughout the UK.
The zone beyond the nearshore zone where sediment motion induced by waves alone effectively ceases.
Order of magnitude
Within a factor of ten; 1 x 101 = 10, 1 x 102 = 100, 1 x 103 = 1000
Any living animal or plant; anything capable of carrying on life processes.
Diffusion of a solution through a semi-permeable membrane into a more concentrated solution, tending to equalise the concentrations on both sides of the membrane.
The Convention for the Protection of the Marine Environment of the North-East Atlantic
A harmonic tidal (or tidal current) constituent with a speed that is an exact multiple of the speed of one of the fundamental constituents derived from the development of the tide-producing force. The presence of overtides is usually attributed to shallow water conditions.
The combination of oxygen with a substance, or the removal of hydrogen from it or, more generally, any reaction in which an atom loses electrons.
The process of adding dissolved oxygen to a solution.