B
Backfill Material used to build up and consolidate the land behind a seawall or similar structure.
Backshore The accretion or erosion zone, located landward of the line of ordinary
high tide, which is normally wetted only by storm tides; a narrow
storm berm (ridge of wave-heaped sand and/or gravel) or a complex of
berns, marshes, or dunes landward of the line of ordinary high tide.
Backwash Movement of water back towards the sea after a
wave has broken
Backwater effect The rise in water surface elevation caused by some obstruction such as a
narrow bridge opening, buildings or fill material that limits the area
through which the water must flow. Also referred to as "heading up".
Ballast WaterWater carried by a vessel to improve its stability
Barrier islands Elongate seafront islands of sand formed by the action
of the sea and having an elongate lagoonal or estuarine embayment
behind them.
Barriers to entry Refers to the obstacles facing potential newcomers to a market. Typical
obstacles include: the high level of skills and/or investment required
to enter the market, bureaucratic/regulatory obstacles,
cultural/social obstacles, action taken by established firms to
discourage new-entrants etc.
Base floodplain The floodplain that would be inundated by a 100-year (one percent (chance) flood.
Baseline study An inventory of natural community or environment to provide a
baseline-a measure of its condition at a point of time-often done to
describe the status of biodiversity and abundance against which future
change can be gauged (usually development driven).
Basin The total area from which surface runoff is carried away by a drainage
system. Other comparable terms are "drainage area", "catchment area",
and “watershed”.
Bathymetric chart A topographic map of the bed of the ocean, with depths indicated by contours (isobaths) drawn at regular intervals
BathymetryThe measurement of water depths in oceans, seas, and lakes; also information derived from such measurements .
BayWhere the sea has worn away the land so that
the land curves inwards.
BAYMOUTH BAR A Bar extending partly or
entirely across the mouth of a bay.
BeachAn area of sand or pebbles lying along the
coast.
Beach A zone, or strip, of unstable unconsolidated material
(e.g., sand, gravel) along the shoreline that is moved by waves, wind
and tidal currents.
BEACH FACE The section of the beach normally exposed to the action
of Wave Uprush. The Foreshore of the beach.
BEACH HEAD The Cliff,
dune or sea wall looming the landward limit of the active beach.
Beach Management Management of a beach as a coastal defence with a
pre-determined standard of protection, using combinations of beach
recharge, recycling, re-profiling, beach control structures and a
programme of monitoring.
Beach ProfileA cross-sectional plot of a shore-normal topographic and geomorphic beach survey, usually in comparison to other survey dates to illustrate seasonal and longer-term changes in beach volume
BEACH RIDGE A low extensive ridge of beach material
piled up by storm waves landward of the berm.
Usually consists of very coarse sand, gravel or shells. Occurs singly or as a series of more or less parallel
ridges.
BEACH SCARP (1) An almost perpendicular slope along the beach foreshore; an erosional
feature due to wave action, it may vary
in height from a few centimeters to several meters, depending on wave action and the nature and composition of the beach. (2) (SMP) A steep slope
produced by wave erosion
Beach NourishmentThe technique of placing sand fill along the shoreline to widen the beach
Bench mark A fixed physical object or mark used as reference for
a vertical datum; a tidal bench mark is often near a tide station to
which the tide staff and tidal datum are referred.
Benefit-cost ratio The ratio of benefits to costs. It should be calculated using the
present values of each, discounted at an appropriate accounting rate of
interest. The ratio should be at least 1.0 for the project to be
acceptable. Inconsistent benefit-cost ratios may arise because they are
dependent on arbitrary accounting conventions.
Benefits Those positive quantifiable and unquantifiable changes that a project will produce.
Benthic Pertaining to, or living on or in the bottom of the sea; upon or attached to the sea bottom (as opposed to pelagic)
Berm A ridge of sand or gravel deposited by wave action on the shore just above the normal high water mark.
Berm BreakwaterRubble mound structure with horizontal berm of armor stones at about sea level, which is allowed to be (re)shaped by the waves
Bioaccumulation The uptake of substances- e.g. heavy metals or
chlorinated hydrocarbons-leading to elevated concentrations of those
substances within marine organisms.
Biochemical Oxygen Demand (BOD) A measure of the amount of dissolved oxygen required by biochemical processes to oxidize organic wastes in water.
Blow –hole A chimney or pipe leading from a
cave up through a cliff to the surface. Caused by erosion and often
exploitation of joints in the geology.
BlowoutA depression on the land surface caused by wind
erosion.
Breaching Failure of defenses allowing
flooding by tidal or storm action.
Breakwater An artificial offshore structure aligned parallel to
shore usually to provide protection of the shore from large waves. It
is a structure protecting a shore area, harbor, anchorage, or boat
basin from waves; defined in the State Navigation Law as a structure
located within the shoreline of a body of water for the purpose of
providing protection from wind and wave action.
Breastwork Vertically faced or steeply inclined structure built parallel to the shoreline,
broken when a flood occurs and water overflows
Buffer areaA protective, often transitional, area of controlled use-in coastal
management, a peripheral zone separating a developed area from a
protected natural area.
Bulk head: A wall erected parallel to and near the high water
mark for the purpose of protecting adjacent uplands from waves and
current action.