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B
- Bench mark (BM) / Repère de nivellement
- A permanent, stable object containing a marked point of known elevation
with respect to a datum used as a reference level for tidal observations
or as a control point for levelling. A tidal bench mark is one near
a tide station to which the tide staff and tidal datums are referred.
A primary bench mark is the principal (or only) mark of a group of
tidal bench marks to which the tide staff and tidal datums are referred.
The standard tidal bench mark of the Canadian Hydrographic Service
is a brass, bronze, or aluminum alloy disk.
- Bore (Tidal Bore) / Mascaret
- A high breaking wave of water, advancing rapidly up an estuary. bores
can occur at the mouths of shallow rivers if the tide range at the mouth
is large. They can also be generated in a river when tsunamis enter shallow
coastal water and propagate up the river. Also called eager, mascaret,
or tidal bore.
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Moncton Bore
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| Reviewed:
2003-04-03
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