New Wave Parameter for Coastal Structure Design

Steven A. Hughes
2004 Coastal Structures 2003   unpublished
PURPOSE: The Coastal and Hydraulics Engineering Technical Note (CHETN) described herein provides information about a new wave parameter for characterizing wave processes at coastal structures. A description of the parameter is given along with sample calculations for periodic waves and solitary waves. The first application of this physically relevant parameter has been development of new empirical relationships for irregular wave runup on smooth, impermeable slopes described in CHETN-III-68
more » ... in CHETN-III-68 (Hughes 2003). COMMON WAVE PARAMETERS: Coastal engineers have established useful design guidance by augmenting theoretical reasoning with empirical coefficients determined from small-scale laboratory testing. Waves are usually included in empirical design relationships via one or more wave parameters considered to be representative of the incident wave condition. Common regular and irregular wave parameters are listed in Table 1 . Table 1 Common Wave and Fluid Parameters Regular Wave Parameters H = wave height H o = deepwater wave height L = local wavelength L o = deepwater wavelength T = wave period k = wave number [= 2π/L] Irregular Wave Parameters H mo = zeroth-moment wave height H s = significant wave height [= H 1/3 ] H rms = root-mean-squared wave height H 10% = 10% of waves are higher T p = spectral peak wave period T m = mean wave period L p = wavelength associated with T p L op = deepwater wavelength associated with T p L m = wavelength associated with T m L om = deepwater wavelength associated with T m Fluid and Other Parameters g = gravitational acceleration ρ = fluid density µ = coefficient of dynamic viscosity ν = coefficient of kinematic viscosity h = water depth α = beach or structure slope
doi:10.1061/40733(147)4 fatcat:rfykgzebifc3nftakz53ig7ypi