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Title: Design for entrance channel navigation improvements, Morro Bay Harbor, Morro Bay, California
Authors: United States. Army. Corps of Engineers. Los Angeles District.
Bottin, Robert R.
Keywords: Breakwaters
Hydraulic models
Morro Bay Harbor, California
Harbor shoaling
Harbor improvement
Navigation channels
Publisher: Coastal Engineering Research Center (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report CERC ; 93-2.
Description: Technical Report
Abstract: A 1:90 scale, three-dimensional hydraulic model was used to investigate the design of proposed entrance channel depth modifications at Morro Bay Harbor, California, with respect to navigation conditions. The impact that the proposed depth changes may have on wave conditions at the existing structures and the spit between the south structures also was addressed, and sediment tracer patterns were obtained in the entrance. The model reproduced the harbor entrance, approximately 7,000 ft of the California shoreline, and offshore bathymetry in the Pacific Ocean to a depth of 60 ft mean lower low water (mllw). A 60-ft-long unidirectional, spectral wave generator, an automated data acquisition system, and crushed coal tracer material were utilized in model operation. It was concluded from test results that: (a.) For the existing harbor entrance, operational waves (8 to 16 ft in height) from the predominant 275 deg direction resulted in hazardous entrance navigation conditions due to wave steepening and/ or breaking. (b.) For the originally proposed improvement plan (Plan 1), navigation conditions in the entrance were improved for operational waves from 275 deg; however, the plan resulted in significantly increased wave heights which may cause damage to the head of the south breakwater during extreme wave conditions (waves ranging from 21 to 30 ft in height). (c.) Of the improvement plans tested, the channel and sand trap configuration of Plan 14 appeared to be optimal with respect to all wave conditions from all directions. Navigation conditions in the entrance will be improved, and the plan will have no negative impact on the existing structures or the spit between the south breakwater and the groin. (d.) Sediment tracer tests indicated that sediment moving in the predominant northerly direction will deposit in the deepened entrance channel and sand trap area of Plan 14 as desired, and material moving in the southerly direction will deposit in the deepened entrance channel. (e.) The -30-ft entrance channel of Plan 15 will result in similar wave conditions for operational and extreme waves as the -40-ft channel of Plan 14, which would be acceptable with regard to entrance conditions and would have no negative impact on the breakwaters and spit area.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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