More info about principal lunar semi-diurnal constituent. Basically it is the tide that the Moon causes twice everyday. The tide can be larger or smaller due to other factors, e.g. varying distance between Moon and Earth, or when the Sun creates spring or neap tide.
So how does it work that Broome in North West Australia has something like 12m tides?
120cm = 1.2m not 12
I know.
See image.
There’s other factors this is one component of the tide. The lunar tide can be magnified by the shape of the floor, like if there’s a shelf close to shore