330
R.H. Charlier and Chr. P. De Meyer
Rhizome : Underground stem or root stock. New shoots are usually produced
from the tip of the rhizome.
Riparian rights : The rights of a person owning land comaining or bordering on
a water course or other body of water in or to its banks, bed, or waters.
Riprap : A layer, facing, or protective mound of rubble or stones randomly
placed to prevent erosion, scour, or sloughing of a structure or embankment ;
also, the stone used for this purpose.
Rubble : (1) Loose, angular, waterworn stones along a beach. (2) Rough,
irregular fragments of broken rock or concrete.
Runup : The rush of water up a beach or structure, associated with the breaking
of a wave. The amount of runup is measured according to the vertical height
above still water level that the rush of water reaches.
Sand : Generally, coarse-grained soils having particle diameters between 0.18
and approximately 0.003 inches. Sands are intermediate between SILT AND
GRAVELS.
Sand Fillet : Accretion trapped by a groin or other protrusion in the littoral zone.
Sandbag : Cloth bag filled with sand or grout and used as a module in a shore
protection device.
Scour : Removal of underwater material by waves and currents, especially at the
base or toe of a shoreline structure.
Screw Anchor : Type of metal anchor screwed into the bottom for holding
power.
Seawall : A structure separating land and water areas, primarily designed to
prevent erosion and other damage due to wave action. See also BULKHEAD.
Setup, Wind : Vertical rise in the stillwater level on a body of water caused by
piling up of water on the shore due to wind action. Synonymous with wind
tide and STORM SURGE. STORM SURGE usually pertains to the ocean and
large bodies of water. Wind setup usually pertains to reservoirs and smaller
bodies of water.
Shallow Water : Commonly, water of such a depth that surface waves are
noticeably affected by bottom topography. It is customary to consider water of
depths less than one-twentieth the surface wavelength as shallow water.
Précédent

- 342/356

Suivant