EM 1110-2-1100 (Change 1)
31 Jul 03
J
JET
To place (a pile, slab, or pipe) in the ground by means of a jet of water acting at the lower end.
JETTY
(1) (United States usage) On open seacoasts, a structure extending into a body of water, which is designed to
prevent shoaling of a channel by littoral materials and to direct and confine the stream or tidal flow. Jetties are built at the
mouths of rivers or tidal inlets to help deepen and stabilize a channel. (2) (British usage) WHARF or PIER. See TRAINING
WALL.
JOINT PROBABILITY
The probability of two (or more) things occurring together.
JOINT PROBABILITY DENSITY
Function specifying the joint distribution of two (or more) variables.
JOINT RETURN PERIOD
Average period of time between occurrences of a given joint probability event.
JONSWAP SPECTRUM
Wave spectrum typical of growing deep water waves developed from field experiments and measurements of waves
and wave spectra in the Joint North Sea Wave Peoject
A-42
Appendix A Glossary of Coastal Terminology
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