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Title: Computer program NARFET - wind-wave generation on restricted fetches
Authors: Coastal Engineering Research Center (U.S.)
Keywords: Dension Reservior
Donelan concept
Fort Peck Lake (Mont.)
Lake Ontario
Off-wind directions
Puget Sound (Wash.)
Wave height
Wind speed
Wind-wave generation
Publisher: Coastal Engineering Research Center (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Coastal engineering technical note ; CETN-I-4.
Description: Technical note
BACKGROUND: Wind-wave generation In lakes, rivers, bays, and reservoirs Is generally limited by the geometry of the water body, which Is often very Irregular. Most approaches to this problem consider wave generation only In the direction of the wind with fetch lengths averaged over small arcs (Shore Protection Manual (SPM) 1984) or large arcs (Saville 1954). Donelan (1980) proposed wave generation on fetch lengths in off-wind directions with reduced wind forcing (reduced by the cosine of the angle between the off-wind and wind directions) for the Great Lakes. The NARFET model (Smith 1989) is based on the Donelan concept, allowing wave generation in off-wind directions. Smith developed expressions for wave height and period as a function of fetch geometry and wind speed based on linear regressions of wave data collected on Puget Sound (Washington), Fort Peck Reservoir (Montana), Denison Reservoir (Texas), and Lake Ontario. The mean wave direction is determined by maximizing the wave period. These equations differ from those given by Donelan which were developed for the longer, more regular-shaped fetches of the Great Lakes. The NARFET model Is quick and inexpensive (runs on a PC), yet considers the complexity of fetch geometry.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Note

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