An investigation of bottom changes in Monterey harbor (1932-1969).

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Author
Lennox, Richard John
Date
1969-06Advisor
Thompson, Warren C.
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Show full item recordAbstract
Bottom changes occurring in Monterey Harbor from 1932-1969 were
analyzed by numerical computer methods using 15 selected hydrographic
surveys. Results of the study indicate that the major portion of the
harbor has been shoaling in the mean since 1932. The long-term shoaling
rate has been 0.4 to 4.0 feet per decade in the beach and nearshore zones
and along the breakwater; and less than 0.25 feet per decade in the
stable outer harbor. The accretion rate averaged 17,500 cubic yards
per year from 1932-1969 but only 7,100 cubic yards per year from 1947
to 1969. The shoaling is believed due to the construction of the Coast
Guard Breakwater in 1931-1934. It is deduced that prior to 1960 the
excess sand was carried into the harbor by littoral transport from Del
Monte Beach and by wave currents around the breakwater. Construction
of the solid wall on Wharf 2 in 1960 cut off the former sand supply.
Local redistribution of sand in the beach and nearshore zones of the
harbor is large and results in areas of significant accretion and
erosion between surveys. Dredging operations have had only short-term
effectiveness because the spoil has been retained within the harbor.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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