Downdrift

The direction of predominant movement of littoral materials.
Found on http://www.ecy.wa.gov/programs/sea/swces/products/glossary.htm

Downdrift

In phonetics, downdrift is the cumulative lowering of pitch over time due to interactions among tones, called downstep, in a tonal language. It is distinct from the general lowering of the pitch during prosodic contours of a tonal or non-tonal language. Two basic types of downdrift are found. In one, called discrete downdrift, when downstep occurs...
Found on http://en.wikipedia.org/wiki/Downdrift
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