American Society of Civil Engineers

Sedimental Journey

by James A. Bailard, P.E., M.ASCE, (Pres., Scour Systems, Inc., Carpenteria, California)

Civil Engineering—ASCE
, Vol. 71, No. 3, March 2001, pp. 66-69

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Document type: Feature Article
Abstract: A numerical shoreline evolution model was used to examine the shoreline changes associated with the release of 2.3 million m³ of beach-quality sediment from behind Matilija Dam in Ventura County, California. Three alternatives were considered for delivering the sediment to the mouth of the Ventura River: pipeline pumping, trucking, and fluvial transport. The latter involves gradually notching the dam. Each alternative was found to produce a buildup of sand on Pierpont Beach, but with differing rates of accretion and downcoast transport. Rates of sand influx into Ventura Harbor were found to increase sharply in the short-term, particularly for the pumping alternative. The trucking and fluvial transport alternatives were found to be the least impacting, particularly if carried out over a long period of time. All the alternatives were found to produce significant long-term benefits to the coastline.

ASCE Subject Headings:
Shoreline changes
Shore protection