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Seawall's seal of approval.

Seawall's seal of approval

In an effort to protect houses built on erodible bluffs near the sea, coastline residents often erect seawalls. Yet some claim these structures hasten the erosion of sand from beaches in front of the wall -- in a sense saving the bluffs to the detriment of the beaches. After spending more than two years examining the question, one group of geoscientists concludes that seawalls do not harm beaches.

Gary Griggs and James Tait of the University of California, Santa Cruz, studied seawalls and beaches at four sites in California's Monterey Bay area. While beaches in front of seawalls often lost sand during certain seasons, the sand returned at other times of years, so the seawalls only temporarily affected beach erosion. The group also concludes that it did not seem to matter whether the wall was made of concrete, large boulders or some other material.
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Title Annotation:research concludes that seawalls do not harm beaches
Author:Monastersky, Richard
Publication:Science News
Date:Dec 17, 1988
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