Design for Wave Protection at Newport North Marina, Yaquina Bay, Oregon

摘要

The Yaquina Bay Estuary is located on the Oregon coast, about 115 miles south ofthe Washington border. Two rubble-mound jetties have been constructed at the mouth of the Yaquina River. Newport North Marina is situated on the north bank of the Yaquina River upstream from the seaward ends of the Yaquina River jetties. The marina was constructed in 1946 and includes a timber breakwater that protects a small-boat marina from wave action. The mooring areas in the marina were dredged. A 1994 aerial photograph of the Newport North Marina is shown in Figure 2. Newport North Marina experiences excessive wave energy due to waves from the Pacific Ocean propagating through the west entrance. The majority of the problems are experienced in the western one third of the marina during winter storms at high tide stages. Waves ranging from 0.9 to 1.2 m (3 to 4 ft) have been observed in the marina during storm events. In November 1981, a 3-year storm event destroyed a port dock and caused $720,000 in damages to the marina. Another dock experienced damage to water and electrical lines during January 1990 storms. Overtopping of the existing, deteriorated timber breakwater may occur as often as four to six times during one winter. Little wave energy appears to enter from the marina's east entrance.