EM 1110-2-1100 (Change 1)
31 Jul 03
DURATION
In wave forecasting, the length of time the wind blows in nearly the same direction over the FETCH (generating
area).
DURATION, MINIMUM
The time necessary for steady-state wave conditions to develop for a given wind velocity over a given fetch length.
DURATION OF EBB
The interval of time in which a tidal current is ebbing, determined from the middle of the slack waters.
DURATION OF FALL
The interval from high water to low water.
DURATION OF FLOOD
The interval of time in which a tidal current is flooding, determined from the middle of slack waters.
DURATION OF RISE
The interval from low water to high water.
DYNAMIC EQUILIBRIUM
Short term morphological changes that do not affect the morphology over a long period.
DYNAMIC VISCOSITY
In fluid dynamics, the ratio between the shear stress acting along any plane between neighboring fluid elements and
the rate of deformation of the velocity gradient perpendicular to this plane.
A-26
Appendix A Glossary of Coastal Terminology
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