Friction in Hurricane Induced Surges

by B. A. Christensen, Univ of Florida, Hydraulic Lab, Gainesville, FL, USA,

Document Type: Proceeding Paper

Part of: Hydraulics and Hydrology in the Small Computer Age


Bed shear stresses induced by the flowing water are expressed by means of a friction factor for which formulas are developed for: ocean bottom, mangrove fringes and areas, forested areas and cypress swamps, grassy areas, and developed areas. The theoretical formulas developed for the friction factors recommended for such areas are based on evaluations of the hydrodynamic drag on individual roughness elements and on a near-bed velocity profile based on a modified version of Prandtl's mixing length theory. Verification of the analytically determined friction factors is accomplished by reproducing the surge flow in a large hydraulic flume with scaled down roughness elements and by field observations.

Subject Headings: Hydraulic roughness | Friction | Hurricanes and typhoons | Shear stress | Numerical models | Shear flow | Ocean engineering | Wetlands (fresh water)

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