Difference between revisions of "Shoreface"

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{{Definition|title=Shoreface
 
{{Definition|title=Shoreface
|definition= The active [[littoral zone]] off the low water line. This zone extends seaward from the foreshore to some distance beyond the [[breaker zone]]. The littoral zone is the zone in which the littoral processes take place; these are mainly the longshore transport, also referred to as the littoral drift, and the cross-shore transport<ref name="Mangor">Mangor K. (2004). ''Shoreline Management Guidelines''. DHI Water and Environment, 294pp.</ref>.}}
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|definition= The shoreface is the '''nearshore zone''' of the inner continental shelf that is bounded landward by the low-water line and that extends seaward to where the influence of wave action on sediment transport is on average minor compared to other influences.}}
  
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[[File:ShorefaceUpperLower.jpg|thumb|300px|left|Schematic representation of a shoreface profile. ]]
 
==Notes==
 
==Notes==
The width of the instantaneous [[littoral zone]] varies depending on the wave conditions. In the general context, we will define the littoral zone as the zone corresponding to the yearly wave climate. The width of the littoral zone can thus be defined as the width of the transport zone for the significant wave height, which is exceeded 12 hours per year, H<sub>S,12h/y</sub>.
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A similar definition is: The shoreface is the zone seaward of the shoreline where offshore generated waves interact with the upward sloping seabed. The shoreface can be divided in two zones, the upper shoreface and the lower shoreface (also called [[Shoaling|shoaling zone]]). The upper shoreface is the zone where most energy is dissipated by wave overturning and breaking and the lower shoreface the zone where waves shoal. The lower part of the shoreface extends to the so-called outer [[closure depth]] <math>h_{out}</math>; beyond this depth the seabed is hardly influenced by waves and wave-induced sediment transport is (on average) insignificant. The transition between lower and upper shoreface is generally defined by the [[closure depth]] <math>h_{in}</math> related to the significant [[wave height]], which is exceeded 12 hours per year, <math>H_{s,12h/y}</math>. See [[Shoreface profile]].
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==See also==
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:[[Shoreface profile]]
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:[[Closure depth]]
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:[[Active coastal zone]]
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:[[Definitions of coastal terms]]
  
 
==References==
 
==References==
 
<references/>
 
<references/>
==See also==
 
[[Coastal zone characteristics]]
 

Latest revision as of 19:12, 30 March 2021

Definition of Shoreface:
The shoreface is the nearshore zone of the inner continental shelf that is bounded landward by the low-water line and that extends seaward to where the influence of wave action on sediment transport is on average minor compared to other influences.
This is the common definition for Shoreface, other definitions can be discussed in the article


Schematic representation of a shoreface profile.

Notes

A similar definition is: The shoreface is the zone seaward of the shoreline where offshore generated waves interact with the upward sloping seabed. The shoreface can be divided in two zones, the upper shoreface and the lower shoreface (also called shoaling zone). The upper shoreface is the zone where most energy is dissipated by wave overturning and breaking and the lower shoreface the zone where waves shoal. The lower part of the shoreface extends to the so-called outer closure depth [math]h_{out}[/math]; beyond this depth the seabed is hardly influenced by waves and wave-induced sediment transport is (on average) insignificant. The transition between lower and upper shoreface is generally defined by the closure depth [math]h_{in}[/math] related to the significant wave height, which is exceeded 12 hours per year, [math]H_{s,12h/y}[/math]. See Shoreface profile.

See also

Shoreface profile
Closure depth
Active coastal zone
Definitions of coastal terms

References